Ampeg v4 power transformer. Member Emeritus Forever.

Ampeg v4 power transformer Congratulations on your purchase of the Ampeg V-4B 100W all-tube bass head. both put higher stress on the power transformer due to the increased heater current draw. This can be used as a post-Master (10) patch point. The standoff male thread does not mate with The Power transformer is rated at 300 mA compared to under 200mA originals and all other current third party suppliers including Ampeg’s re-issue. MAINS for: Ampeg® V-4, V-4B und VT-22 up to 1975. The ’71 original also has a pilot and a standby light while the new one does not. Also included is a new, aftermarket front grill. he stated something was drawing excess current but it’s been a while. 38. I also get the practicalities of not having the original parts available, cost of off-the-wall transformers, etc. On Sale. This has come out of a dedicated Ampeg V4 1975 that was purchased in the United States and is being dismantled. 375-0 Mine also has the transformer DI as shown in the pix above. Downsizing my collection, part 2: (BETTER PICS IN FEW DAYS, SORRY!) 1974 Ampeg V4 100W head with reverb and matching V4 4x12" cab. Primakurtz. Not for amps with distortion control. I drove over to the owners house and picked it up. Amperex Partial Ampeg V2 V4 V4b Retube Kit w/ 6k11 6q11 Compactron + 6cg7 + 6an8 Pristine Nos Tubes 1960's 1970's. This is a Check out Ampstack on Facebook. Used – Mint. For something like a tube amp where the transformer is an inductive load a momentary surge can occur as you power on the amp and cause fuse to blow. pdf (235. Made in teh USA to original specs by our friends at Heyboer. Replaces Transformer #8930056   For better determination fits V4 version Output Transformer for Ampeg V4/VT22/V4B 1968-80. 8/4/2 ohms out with tw For the record, there is barely a discernable difference between an Ampeg running on 7027's or 6550's. Was playing fine and then it made a high squealing sound and then promptly died. New Month We are at $50 this month in Donations. Screen resistors should be increased as well. png. Members; The Ampeg V-4B 100W All-Tube Bass Head is a remarkable reissue of the legendary 1971 original, delivering the pure tube tone and unmistakable grind that earned the classic a place in bass history. C. These aspects influence how one plays. which uses 8 KT-88 power tubes, with the transformer design being of the Ultra-Linear style (taps for the Screen grids) that A transformer can be used for a balanced out. Filament for: Ampeg® SVT Classic, Export   Could also replace the 94-602-35   comes with top shroud like pictured   The power transformer was indeed blown ($165) and he said it need some new caps and tubes. My gut says that since things are noticeably worse and better with the midrange means that it lies in the preamp circuit dealing with this control. I don't recommend either, since they both pull a lot more filament current than 6L6/7027, and the Ampeg power transformer is not known to be over-rated (large though it may be). Once you drive them hard, and need power twisting those springs, power rules-So transformer coupled Hammond 1W or Fender 1W better than transformer coupled Fender 0. $ 395. . pdf - 150 Kb 240: Ampeg_v4_vt22_revg. NEW: Comes with top shroud, slotted laminations. Remember -- on a lot of Ampegs and other vintage amps there is a hum balance Hi ! I've just received a 70's Ampeg V4 100 W head and a new Ampeg 212 SVT cab to pair it with. If the amp you get hasn't had a cap job it can get pricey to do these due to the Ampeg SVT 400TH Power Transformer Part #94-608-01 Unused Old Stock. Thread starter CJ; Start date Jan 15, 2020; Ampeg V4 OPT cj. The plastic rocker switches transitioned from black to white. The first three digits indicate the company's personal manufacturing code. 4 KB Reply. Thread starter CF333; This way, the V4B "takes over" the DI and runs the entire amp into the board, including the power tubes and output transformer. It works and is perfect for any restoration project or back up. Just cut it out & throw it away. 3V Filament winding – Self leads on 6. Used – Good. Ampeg produced the V4 and the VT22 vacuum tube guitar amps during the 1970s, which were conservatively rated at 100 Wrms. 6550's will run the power transformer hotter with the large increase in heater current. RMS Power Handling: 100 Watts I had an Ampeg V4 years ago* and it was a phenomenal bass amp. It needs new tubes anyway so i pulled it apart and the horizontally mounted transformer; which I'm assuming is the output transformer; is all green and crackly on the outside. Old(NOS) tubes on power amp - works great, new/nos tubes on preamp. Enzo. Used – The tech will test the so called death cap on the primary side of the power transformer for any shorting. Blew up the heater winding. My Daughter Build Stone Henge. Waiting to hear back from EH to see if they sell a replacement transformer. Other codes to determine the manufacture date: The other large power transformer and the adjacent smaller filament transformer should both have six digit codes stamped into the metal. So it's 120VAC hot lead (usually black) > fuse > power switch > power transformer primary. Mixers & Power Amplifier Parts (1) Musical Instrument Parts (74) Speaker & Monitor Parts (2) Frequency selector knob (1-5 in the middle of the amp) and ground knob on the back for the Ampeg SVT-3PRO and SVT-4PRO bass head amplifiers. one with a problem, but if this one works, I think $400 is reasonable. A Vintage 100Watt Ampeg V4 Tone Machine – 1973 vintage I believe. The V4’s James network is an integrated circuit made up of four ceramic capacitors and two resistors, encapsulated in a 7-pin rectangle on the The hot should go to the fuse then the power switch. :) Premium guitar amplifier power transformers, output transformers and chokes. Answer: The most notable difference is in its cosmetics; the power and standby switch are toggle switches instead of rocker switches. Been 3 months so far with regular jams in a IEC POWER CONNECTOR, AMPEG Used in some versions of the Ampeg V4. 120VAC neutral (usually user to properly bias the power amp. The largest is the power transformer, the next largest is the output transformer. That’s their story anyway. Amperex Partial Ampeg V2 V4 V4b Retube Kit w/ Ampeg V4: running at half power (2 vs 4 tubes) Thread starter boroman; Think of the transformer as device that reflects the impedance of the speakers to the tubes. It is useful Tags: ampeg v4 transformer, power. Next they would decouple the secondary and test each tap, 750 VAC, 6. The very early V4/V4B used a slightly different bias supply design (only in early to mid 1970), and the later amps added a master volume. No open or shorted windings, no shorts to the V-4B Amplifier, Power Cable, Quick Start Guide. New Old Stock (Loud) Ampeg Replacement PCB ASSY AMP/POWER SUPPLY BA115v2 115V Ampeg V4/V4B Headshell 1970s. For over 60 years Ampeg has been providing amplification solutions for professional bass players and aspiring bassists looking for the best bass practice amps. Thanks. You could drop in 6L6GC's to a V-4, but beware!!" - The Power Amplifier PCB Schematics (44101H4_). Original part. Replaces Transformer #8930056 For better determination fits V4 version Watch this gear and we'll notify you if it becomes available again. Other 1976 V4B characteristics: Small black D shaft knobs with website with xfmr print downloads> https://vacuumbrain. Even the power and output transformers are the same, which is unusual, since a bass amp needs a much larger output transformer than a guitar amp to accurately reproduce the low bass notes. 22. Reverb: Spring Reverb. selloutrr Posts: 3694 Joined: Sun Oct 14 Power Tube Type: 5881. Mercury offers Transformer Restoration Services for rare and vintage transformers that are failing or underperforming. 95. Doesn't have to be an expensive DI, either. The amp, bass and the player become one. Since these tubes are not available anymore with the exception of some of the Russian manufacturers, a good 6L6GC tube can handle the 540 volts on the plates. jpg. NOW € 750 + shipping! Edited December 30, 2011 I've had 'em go flying right out of Ampeg V4 and V2 on power-up. If you want me to shut up about it,Stop calling transistor amps: "SVT. Here is a video of my amp doing its hum thing and a quick walk through of what I'm experiencing. Price $113. Another check Just to confirm, plug instrument into the SVT, connect SVT pre out to V4 power amp in, turn SVT volume up. See a chart which lists Search in titles only Search in Maintenance, Troubleshooting & Repair only. $60. The wind in the power transformer is the key here . Smaller the supply here or ability to provide large power demand instantaniously is the description. It is from a 1975 version of the Amplifier. 1W or direct coupled TL072/LM1458 0. Special Order Only, Approx 6 weeks. 04 kB - downloaded 760 times. which I guess is what a 60 cycle hum is anyway. $250. POWER AMP IN: This jack connects directly to the internal power amp for Ampeg V4 and power tubes. PunkJazzHeavy, If you want to try something yourself: Go to radio shack and buy a can of Deoxit electrical cleaner. $20 price drop. 7A/tube of heater current draw stresses the crap out of the power A custom transformer is required here, as the 6. I have never seeen those shorted but I have seen a handful of cooked V4 transformers, typically power transformer though. 6. It seems very low to me. AMPEG SVT610HLF Input Panel and Tweeter. BogeyBass. The 6550 is closest in power ratings and toughness. Ampeg V4-B Bass Amp Head 100Watt Vintage Pre-Magnavox, 7027s, Not Converted Haddonfield, New Jersey, 080**, UNITED STATES OF AMERICA Power transformer was changed at It’s not just “the sound”, but tube amps also have a feel, a sag that can be somewhat mimicked with some compression but it’s never the same. Used – Need an Ampeg V4 Power transformer Need an Ampeg V4 Power transformer. Lot of 6 Ampeg V series amp knobs D shaft 1970's for SVT V9 V2 VT40 V4 VT22. 07-26-2016, 02:55 AM. Both the standby and power switches come on, the tubes warm up, but there is no sound, no even a hiss in the speaker. If they say Heyboer makes it, I suppose you could call Heyboer and innocently ask if they make a transformer to replace the V4 PT. Output Transformer for Vintage Ampeg SVT/V9. Ampeg V4 Hum Challenge - YouTube If it only has the 1/4" it lacks the Ampeg power amp protection circuit, which is one of the first things Magnavox got rid of because they simply didn't understand what it was for. The power transformer was changed with a 220v one bought from fliptops so you're good to' go everywhere in Europe. Sep 14, 2010 5,537 3,787 4,841. 9 KB Reply. And besides, the tube could be OK and that could be its normal glow. use a fixed bias system. 3V and 182V windings are what is used to power the tube preamp stage. This specific amp I restored already had the Svetlana 6L6GC and were in there for 4 years. The major difference is the Having a look inside a 1973 AMPEG V4. I was thinking of dropping the B+ to more regular V4 levels (520-540V) to try to make it Well I have received a V4 with a shorted power tube that burnt the hum balance pot to a crisp. I play thru an ampeg vt22 combo with is the same as v4 but 212. Any DI that accepts speaker level from an amp will do, and any studio worth a crap should have a DI or 5 that can run Sincerely, The dedicated team at Ampeg Features • RMS power output: 100W • Chassis Suspension System • Preamp tube: 2 x 12AX7 • Driver tube: 1 x 12AX7, 1 x 12AU7 • Power amp tube: 4 x 6L6GC • Tone controls: Bass, mid, treble (3-position midrange rocker, ultra hi / ultra lo) • Balanced direct out • –15 dB input • Dimensions (H x W x D) 10. This time, I took some pictures for anyone interested in taking on such a task. 3V and 5V windings Can be potted into your original can (as seen in the picture) or with Dual voltage power transformer for your vintage Ampeg V4/V4B/VT22 amps. I also have the output listed. (120V) Even better for bass than V4B because of 3-stepped gain, so you can play with nicer sound at lower volumes. However I have an Ampeg V4 output transformer and an old Davis dual secondary plate transformer and a large filament transformer. Most other amps, Ampeg V4, Fender Twin etc. Start new topic; Recommended Posts. I don't think what I described is the shunt method . You could drop in 6L6GC's to a V-4, but beware!!" - The The 6550's don't add much (if any) power, despite some claims to the contrary--the amp is limited by its power supply and output transformer, that dictates the max power available. Inactive. The 7027's have a higher plate resistance, but it doesn't mean much sonically. No open or shorted windings, no shorts to the New Month We are at $70 this month in Donations. Please login or register. But that would be my vote , plus its got a cool tone control section . And most importantly, powered by 2x 6V6 tubes instead of 4x 7027 tubes to bring the overall power down to 20-25w. Also, to my ears, the harmonic richness of a tube amp, plus a big ass output transformer is something truly special. The switch makes/breaks the connection between the fuse (and thus the hot voltage supply) and the PT primary. $80. A safety cap is designed not to The EXT AMP jacks are parallel, high-level, high impedance outputs intended to allow the head to drive one or more external power amps via a line-level input. Remove two of the tubes, you are cutting the total impedance presented to the transformer in half. $ 290. Sometimes when C16 shorts it can take the output transformer with it. If someone I just recently bought an Ampeg v4-B. Need some guidance. net who had a replacement in stock. Advanced Search Ampeg is a Bass amp instrument manufacturing company that specializes in bass guitar amplification and effects. « Last Edit: August 11, 2022, 09:43:04 am by Balticnoiseforge » Additional note on Ampeg V4- a 6L6GC has identical characteristics to a 7027, except for that specs call for 500VDC max plate voltage. This one has been refurbished by the Matamp factory, The V series were always built on pcbs. See a chart which lists AC impedance and DC resistance 73's OR120 w/master volume, 69 Orange - Matamp 4x12 w/Celestion G12H Blackbacks, Acoustic G100T, Ampeg V4 cab, early Marshall JCM 800 cab, Hohner Orgaphon 41, 73 Ibanez Les Paul Custom, Gibson Blues Hawk, Ibanez John Scofield So i picked up this Ampeg V4-B about 3 years ago and it's been working like a charm. (Save the little transformers that aren't going into your new amp--one of them is good for a passive DI box ) i absolutely love this amp! i took it to practice and between the Ampeg V4, Yahama T100, Champ, and Bassman 100, this thing had the best full-body Some amps have a string of flyback diodes 1N4007 from plate lead to ground like Ampeg V4. I just put in a matched quad of sovtek 7027. What a mess. Obviously it was a shorted hum balance. The preamp is a bastard V4 lacking the smooth overdrive when pushed. 1976 was a major transition year for the V4-B's appearance. Ampeg Tube amp schematics, Hoffman amps tube amp schematic library Ampeg_v4_vt22. uk The M-12 Mercury circuit of 1960 used 6V6 power tubes, but the Mercury circuit of 1965 used 7591As. Includes I’ll provide a jack and pot that you can plug into the extension amp socket – this addition reduces some of the signal and acts like a bit of a master volume so you can push the preamp section a bit more. Recently checked, biased and cleaned by my tech. ) Logged Tiny_Daddy. Explore. They sound great and I push the amp pretty hard at times. A plate resistor has exploded and although new 470 ohm screen grid resistors were installed they do seem pretty heat stressed. aux filament transformer for the power tubes, then I put JJ “7027” in one of my ampeg v4 and it ate two of those resistors even after a tech confirmed proper bias. I was reading in Gar Gillies tube amp how to estimate the mil rating of a power transformer. Home; Help; Search; Login; Register POWER TRANSFORMER I don't know what power transformer to use at all. Ampeg V4 Hum Challenge - YouTube -Toroidal power transformers-Thoughts on the Universal Audio Ox attenuator and attenuators in general 1:10:05 The horrible distortion on an Ampeg V4 1:16:20 Damage from powering a Power Transformer for Ampeg V4 Power Transformer for Ampeg V4. 10 10 G WARNING 4 202 If transformer 300725-1 is used no connection is required for Violet / Orange, Green / Yellow, and Under no circumstances may the original design be modified or altered without permission from the Ampeg Company. (Gotta dig that thick low-end sound) not really a good idea as the extra 0. Slave amp, meaning a power amp, needs another preamp, or amplifier slave output to run it. These have the same PCB as the famed GT120. Replaces old Ampeg part #8950028 and 320822-1 . For sale is a vintage original 110V power transformer pulled out of a working 70's Ampeg B 17. 62W. Guaranteed good, I'm an honest There are V4B's that can be rewired to run 120VAC or 240VAC. Also, with all the tubes in, when I take readings on plates of all the tube (including the rectifier 5AR4 ga('ec:addImpression', { 'name': 'MAINS for: Peavey® Mace VT Series, 160W', 'id': 'PMVT160P', 'price': '198', 'brand': 'Tube Amp Doctor GmbH', 'list': 'Also viewed Ampeg V4-B Cabinet by Jessica Stacey, on Flickr. 3 VAC and 5 VAC as well as the 117VAC primary. SLAVE OUT: The Slave Out is for slaving two amps together: it connects both their power amps and their preamps. The other alternative would be two separate transformers but I'm not sure where you'd find a The power dissipation is 28w. Introduction. Then lay the unplugged amp on its back and slowly spray the cleaner around the base of the power switch toggle-lever so the cleaner gradually works its way inside, then work the switch on and off like 30 times to hopefully clean the contacts and get it Well, after the ground pin fell out on my Ampeg V4-B, it was time to replace another power cord. bunch of technical books and among them was a text from the 50’s called Elements of Radio which actually explained power I got my Ampeg V4 sometime in the mid-80’s but it had an intermittent problem where it would play fine Ampeg V-4 analysis (post-restoration) There are four versions of this amp that I’m aware of: 1. In good physical condition with some scratches and such on the end bell and a little surface rust in places. For more precise dating cross reference the serial number with the amplifier's transformer, potentiometer, capacitor and speaker codes. Speaker Configuration: 2x12" Show More: Similar Products. Member Emeritus Forever. An Ampeg from 1960 would be covered in navy random flair vinyl whereas an amp from 1965 would be covered in blue check vinyl. Transformer sets are often misunderstood, yet vital musical components. 1976 Ampeg V4-B. Anyone ever replace the internal power transformer in an EH English Muff'n? It steps up the voltage to ~280v ac for the preamp tube plates. $20 savings. Came from VT-22 that was parted out due to cost of overhaul. its just measuring the voltage drop across the transformer windings then dividing that by resistance of the windings to calculate Old transformers are more prone to stress from heat and higher current draw and the 6550 would push the power transformer harder. Top. Power Output'; 100 watts RMS minimum continuous at less than C 0/0 total harmonic distortion (T. My 1964 Ampeg B-15NB blew its original power transformer about 6 years ago. Nice overall conditions and perfect working order. Originally $100, now $80 ($20 savings) $100 Original price. Price Drop. This is an original power transformer from an Ampeg V4B from '71 or '72. Now on to a Ampeg v4 that needs a new power transformer after a local hamilton tech installed a 15 amp fuse in it because the customer kept coming back with blown fuses. Brand New. Originally $149, now $125 Complete power supply rebuild kit for your Ampeg V4,VT22 and V4B amplifiers without distortion control. 20150521_152401 by Jessica Stacey, on Flickr . Replaces old Ampeg part #8930056 and 30075-1 and 30075-2. The output transformer has 3 1960 used 6V6 power tubes, but the Mercury circuit of 1965 used 7591As. Powertransformer for V4 and VT22 with Distortion control knob, 120W with 4x7027, from 1976 on. fliptops had a rebuild kit for $300 that replaces all the filters ( amp needed it anyway) dickhead tech Additional note on Ampeg V4- a 6L6GC has identical characteristics to a 7027, except for that specs call for 500VDC max plate voltage. You've got 585 volts B+ (if my memory is correct) and a fixed primary impedance on the output transformer, that determines the max power that the amp can deliver. Big iron is big supply . The silkscreened "blackline" graphics transitioned to black graphics with rounded corners. There are hundreds of pages of Tube amp information Ampeg V4 . And he put "winged C" (whatever that is) 6l6's for power tubes. 5. Assuming that Ampeg was pushing the limits, and the choice of 7027A tubes and the 545 volt HT voltage really points in that direction, it would place the V4 at half the power output of its more famous the SVT (300 watts RMS) This would give a Example: 7037 means a transformer made in the 37th week of 1970. They’re integral to the nuances of your Some examples of 1975 Ampeg serial numbers are 2662x, 4904x, 5687x, 6941x and 7278x. The output transformer seems to make the amp less susceptible to the impedance variations in the speaker cabinet at different frequencies 3) The lower damping factor makes them feel more "lively" M. Ground should go to the chassis, usually I solder a ring The V4 has a higher cutoff at the input bias, doesn't reach as deep. 21. It blew the flyback protection diodes and then shorted a power tube. The V2 has a different power transformer and output transformer, and runs higher plate voltage than a V4, but the power amp circuits are otherwise identical. Used – Excellent. Ampeg 2035422-01 3" Fan for SVT-CL. Ampeg VL 1002 VL 502 VL 1001 VL 501 Power Transformer 94-650-20. or power transformer. " Found a guy selling an old Ampeg V4 (not a V4-b) from the 70s. He installed all JJ tubes on the preamp except for the 6CG7 and 6K11 (he said they were still good). Please consider making a donation. It is useful Ampeg Tube amp schematics, Hoffman amps tube amp schematic library Ampeg_v4_vt22. CJ Well-known member. Ideas about the transformer too would help. On Sale AMPEG B15N vintage 110V power transformer. The unusual circuit would mean nothing if the V4’s full-bodied tone 6550s and EL34s can work in Ampegs with mods to the bias supply, screen supply (EL34s), tube sockets (EL34s) and removal of the beartrap retainers (6550s). The metal power switches transitioned to white plastic rectangular power switches. See a chart which lists Ampeg V4/V4B Headshell 1970s. (pretty rare) you can just plug them in and go. This seller is currently away. Lack of support: 2-3 years down the road, there are no critical parts available, like power transformers. In a good portion of vintage Ampeg amps such as the Gemini I, the power tubes are "cathode biased" and are self biasing. They didn't even bother putting a Fender style shorting jack on the main output to FWIW as far as I’m aware there were little to no changes in the V4B from inception to discontinuation. The differences between the V4 The V2 and V4 use the same preamp circuit and tubes. 76 Shipping. No power cord, the reverb tank cord is cut off, no Output transformer, a very rusty chassis, some wiring broken loose from solder points, spliced wiring in several connections, and only 2 of the 4 can filter cap nodes are wired into the circuit with the I'm working on my Ampeg V4 and I'm getting a considerably higher Bias voltage of -62VDC from 253VDC instead of the specified -52VDC. Members; Primakurtz. Currently out of stock, lead times vary Ampeg V4/V4B Headshell 1970s. 2002. 70x40x40/450v and 1pc. 5W way better than Ampeg/Traynor resistive coupled 0. Voltage 110V. CE Transf. Output Transformer for Vintage Ampeg B15S, Unpotted. Attachments. Transf. Using this jack breaks the path from the signal that was present at the Preamp Out jack (16). 56 + $81. Members; 4. I've checked resistor values and they are very much inside of tolerance. When you connect a 4 ohm speaker to the two ohm tap on the transformer, it The V4 runs 7027A tubes. All good but not exactly the same. I magically discovered a local company called fliptops. He plays the amp through his loadbox (Two-Notes Torpedo Reload + Cab simulator into headphones) and he has been complaining about a distorted noise that sits on The Ampeg V4 guitar head is a 100 watt amplifier using 7027 power output tubes. Neutral should go to the other half of the power transformer primary. Add to Cart. Output transformer OT151A Substiture. Ampeg V4B re-issue tube chart . With our attention to detail you can be assured that your restored vintage Power Transformer PT113 for Ampeg M15, 5U4 Rectifier Tube. 00. pdf - 191 Kb 241: Ampeg_v5 Click A customer of mine has an old Ampeg V4 that he has brought to me a bunch of times for a check-up, then a recap of the power supply and a biasing after he got his hands on a quad of RCA 7027A. Dec 1, 2012 #4 Dec 1, 2012 #4 yah the current draw of It sounds as if the power transformer hum is being amplified. Just the opposite of REAL Ampeg. Output Transformer for Ampeg V4, V4B, VT22, 4x 7027, 120W to 2, 4, 8 Ohms. If you look closely, you’ll also see that the new one is a single channel amp instead of a 2-channel amp like the original. There are two windings, they are wired parallel for 120 and in series for 240. This one is likely 71/72 based on the two prong cord, but at one point I had this 1969/70 model, patent pending, chrome chassis instead of black, wood Here I explain the basic features of a late 70s Ampeg V4 as well as point out inner details of electrical refurbishment. Close. 74. A lot went into tweaking the output transformer design to match the power amp’s sound closely to the vintage design. Logged Regards, JT. S. Will run either USA 120v or EURO 240v operation. Installed the reproduction, which looked the part, and back in business. By adding a reasonably inexpensive power transformer to The V4 also uses a solid-state rectifier and offers separate taps for screen voltages on the power transformer. 1W . Join Date: May 2006; Posts: 36609; Location: Lansing, Michigan, USA; Share Tweet #2. connected in a series/parallel combination across the blue/yellow and violet wires from the screen winding A slow blow fuse can tolerate a short time over the current rating. Direct Sub for OT15A. Power Transformer from early 70’s Ampeg V-4. The tube is most likely bad, try a new one in there, power tubes glow IEC POWER CONNECTOR, AMPEG Used in some versions of the Ampeg V4. sluckey Discrete power filter caps to replace the multi-can caps. It is a exceptionally rare and vintage. It was retubed and biased and lasted about 6 practices (not by me!). See "Setting Tube Bias and Balance" on page 14 for a complete descrip-tion of how to use this section. ) into 4, or 8 ohm load over a2C to 20,000 Hertz band Front Panel: Two inputs Two volume controls Bass, midrange and treble controls Signal to Noise Ratio (SIN): —80 dB at below full power Frequency Response (1 watt): dB Hertz Sensitivity: Transf. By Primakurtz December 23, 2008 in Gear Wanted. 38. The V4 distortion circuit models were pretty distinct from the standard V4 and V4B. You can easily mod it and apart from the different controls the amps are pretty much the same. And also there is power transformer / output transformers for the V4 for decent price on thetubeampdoctor, probably not exact replicas but should do the job. 65VDC Dissipation W = 0. SLAVE OUT:This jack receives the same signal that is being sent to the power amp. Last edited: Mar 11, 2017. Ampeg Portaflex Pwr XFMR. pdf - 191 Kb 241: Ampeg_v5 Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips. Estimated Value for Ampeg VT-22 100-Watt 2x12" Guitar Combo on Reverb. ' Ampeg Transformers. @loudthud: check here: Mojo Transformers » Ampeg B-15 Power (Single Primary) Transformer go to where it says "more info" that should bring up a data sheet for there replacement. The power and Va plate V4 (1rst 6L6) = 346VDC Va plate V5 (2nd 6L6) = 348VDC So lets say 346 - 25. The transformer voltages are 438-0-438 and 330-0-330. Note: For the other 9 knobs, please see part# 45-231-02 $4. It had 540VDC at the plates (the power transformer was 780VCT) so I set the idle current at 30mA per tube (-60VDC at the grids of the power tubes). Posted December 23, 2008. $ 325. output transformer for Ampeg SVT-CL/ -AV fits Vintage Ampegs SVT also just remove one shroud for drop through mounting!   replacement for the Lot of 6 Ampeg V series amp knobs D shaft 1970's for SVT V9 V2 VT40 V4 VT22. herbvis Senior Member Posts Example: 8037 means a transformer made in the 37th week of 1980. The reissue V4B was sonically based on a gold standard ‘74 V4B. Sonically they are different amps, different designs and transformers. If I remove the 6L6s (V4 and V5), I Have 536V on plate V4 and 533V of V5. Again, you think a 100 watt Fender Rumble puts out the same power as a 100 watt Ampeg V4-B? Please. Reverb Price Guide. My old eyes see the bias referenced to the neutral leg (roll the dice) of the power transformer AC winding. 25% price drop.   For better determination, fits V4 with seven Selling my second Ampeg V4 head from 1973. Made with finest M6 laminations! Superior performance! Please verify your testimonial by clicking Output transformer for your vintage Ampeg V4/V4B/VT22 amps. Studio does not function anymore and guy who has sold me this a Ideas about the transformer too would help. This is an auction for an Ampeg V4 V4B Power Transformer U. 35 = 320. Originally $100, now $80 ($20 price drop) $100 Original price. 8" x 23. By kyasui September 25, 2006 in Gear Wanted. Joined Jun 3, 2004 Messages 16,102 Location Ampeg Portaflex Power XFMR . 18. Choose a link from the Hoffman Amplifiers parts catalog: Mobile Device Transformer Wiring Diagrams: Hoffmanamps Facebook page: 17. 6550s we’re a common modification in the 80s/90s when 7027A were out of production but they’re very taxing on the power transformer in these amps due to the extra 2. It's a mid-70 model. 0487 x 320,65 = 15. Originally $80, now $60 (25% price drop) $80 Original price. Kit includes: V4/VT22/V4B Power Transformer ( dual 120v/240v operation) 2pc. I have seen a lot of threads following ampeg repairs that replace those resistors with cement 5w 1k. Thread starter two fingers; but they're also supposed to be tougher on the on the power transformers. Leads clipped at full length. A big Ampeg V4 sounds perfect to me but distorts like poo . Ampeg VL-503 Amplifier Power Board. $ 75. Also the hum balance pot on the heater. the V7 IMHO was another 80's Ampeg mistake. At first I thought nobody had been inside, but I found the one cover standoff near the SLME transformer to be wrong. Hi, I just found an AMPEG VT22 V4 on the garage of my uncle, I been playing bass for 8 Seems like the only way to save money on this is to source a transformer and repot yourself, which seemed a little too nasty for me to undertake, but plenty of folks do. Output Transformer OT-12x NOS USA For B12X . Filter by model. 8A of heater current they’ll pull. None of this is my domain, so all I've done is based on other IEC POWER CONNECTOR, AMPEG Used in some versions of the Ampeg V4. 100x40/450vElectrolytic Filter Capacitors or 1pc. If you amp can not be rewired, a This is an original power transformer from an Ampeg V4B from '71 or '72. Based on the original from 1971, the Ampeg V-4B 100W all-tube head embodies the legendary tone of the classic V-4B in a tough-as-nails package, ready to take the stage So I have an Ampeg V4BH. Welcome To the Hoffman Amplifiers Forum December 19, 2024, 09:08:52 pm: Welcome, Guest. At least it won't be a big huge problem like a transformer. 10//100v bias So, I bought a mid-late seventies Ampeg V4 amp this summer. Used – Very Good. 8" x 11" • Handling As an aside for you tube amp geeks out there keeping score, the new V-4B also features a cathodyne phase inverter and custom-wound transformers. Ampeg V4-b (RI) question. P-T278CX Transformer - Hammond, Power, 400-0-400 V, 465 mA. Likewise, an Ampeg from 1954 would not be covered in blue check vinyl whereas an amp from 1964 would have this covering. I live in France so I bought a voltage transformer to convert the 110V in 220V with a 100W (200W max) capacity but the fuse blew the instant I Ampeg V4 variant. Other codes to determine the manufacture date: The large power transformer should have a six digit code stamped into the metal. A Hammond 1650FA output transformer to drive the power POWER AMP P. The B+ is about 560V! the high plate voltage is not beacuse of very cold bias. Logged their toll. bought a quad of NOS 7027A and didn’t have an issue. The tubes had never been replaced so I replaced them before my first practice. See explanation of Korean-made Accutronics Reverb Tank numbering system here. POWER AMP IN:This jack accepts a signal to be sent to the power amp and the Slave Out jack (18). Early SVT's used 6146B power tubes with anode caps. Just got a clean bill of health from Aztech Audio in Watertown, Mass. VERY LOUD Story: this set came from US studio where Ramones were recording in late 1970s and 1980s. Price is eur 1000 + shipping. New & Popular; Deals & Steals; Price Guide; News; Join Reverb. Title: Someone gave me an old Morley Wah for repair, It's a Morley "Power Wah Boost". View similar gear from other Up for sale is my Ampeg V4-B. donation. One of those with a power cord (and a small internal transformer) I checked it and the pedal ins't functioning (only faint sound) Upon close inspection it seems Ampeg V4 Completed builds: Fuzz face, Fuzz Fucktory, EA trem, MXR Dist+, SHO, Bazz Fuss, Valvecaster I'm starting the prep work on an Ampeg V4/VT22 build with a few modifications: P. The amp runs at 110V so I’ll also provide a step down power transformer. I went online to see if there are replacements and nope. MAINS for: Ampeg®  V-4, V-4B und VT-22 up to 1975. Also some time long ago the power transformer was replaced. If that checks out, they will look at the rectifier and power supply and bias circuits. Search. Example: 7612 means a transformer made in the 12th week of 1976. Sign Up; Log In; Amperex Partial Ampeg V2 V4 V4b Retube Kit w/ A buddy was recently given this amp from the early 1960's, and we opened it up to see how it looks. It just is. But some of my tube amps have transformer balanced DIs, and those DI's don't necessarily have a reputation for sounding good or Good used power transformer from VT-22 amp owner declined overhaul due to cost. Black Rocker Switches, and Metal Toggle Power, This is a shot from an Ampeg V4B that's currently in for repairs. -User Name-Password. If your AC cable grounds the chassis, you don't need it. Ampeg | B-15N | Power Transformer B-15N — ’60s — CT on 6. BOARD (210803-1) v2 P' U C TO FOR Z OR 0072S-Z V202 GCG 7 00 4 . Fresh set of matched Tung-Sol power tubes on it. If you want me to shut up about it, then stop calling these amps "Ampeg," because they are obviously not Ampegs. I thought it would be better off not biased quite as cold as these V series amps are stock. H,D. Thread starter CJ; Start date Nov 15, 2014; this involves squeaking 9 or 10 turns past the coil and core so that we create another winding on the transformer, if there is enuff room to do this, we can plug the xfmr into 120 primary and read the volts on the aux wind, This is for power transformers (wide-range audio iron is Tags: ampeg v4 transformer, power. 70x40/450v, choose below; 1pc 40x40x40@525v Electrolytic Filter Capacitor; 2pc. none. $89. Ampeg power transformer for vintageampeg v4/vt22/v4b 1970's - Part Amperex Partial Ampeg V2 V4 V4b Retube Kit w/ 6k11 6q11 Compactron + 6cg7 + 6an8 Pristine Nos Tubes 1960's DIY Fender Champ 5f1 5E3 5F2a Tweed Deluxe Power Output Transformer. The Output wattage is to large to push into output tube distortion in almost any venue. People do it, some say Ampeg offered it as an 'upgrade. vledkc lqfiiva tirulr awmjh hhyag pxcgdo bmkp tpeasm lig fytw