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Old 01-12-2018, 10:04 AM
mjslakeridge's Avatar
mjslakeridge mjslakeridge is online now
Join Date: Mar 2013
Location: Houston, Texas
Posts: 980
Default Modified Guitar Amps

I mentioned my modified Super Twin Reverb in response to another thread, so I thought I would start my own thread and share some pictures.

I bought the Super Twin Reverb in a pawn shop probably 25+ years ago. It was in working condition, but after using it for a few years I took it to a repair guy for some new tubes. He talked me into letting him modify it to become like a regular Twin Reverb. Disconnected 2 of the 6-6L6 power tubes and modified the circuitry to allow switching between 25/100 Watts (was originally 185 Watts RMS). He used Svetlana power tubes.

Later on I built a cabinet for the chassis and removed it from the original case, because as a combo amp it was just too heavy to lug around. Even as 2 pieces, it is quite heavy. Look at the massive magnets on the 12" speakers. Then I added a small computer fan to help cool the inside of the amp head. It is powered by a small "wall wart" transformer that I plug into one of the power outlets on the back of the amp head. I used a low power transformer (6 volts I think), to not have the fan run at full speed, and it is pretty quiet. The grill cloth on the amp is not original. Originally it had a silver plastic frame holding the grill cloth, but there were some holes in the cloth and the frame was partially broken, so I built a wooden frame and added some new black fabric. I didn't bother adding Tolex to the amp head, I just painted it matt black. I believe this amp was made in the late 1970s.

Also, I modified my Fender Vibro Champ that I bought new in August, 1979. (I still have the original receipt from Roy and Candy's music store in Tulsa, OK stuffed into the owner's manual, so I checked the date this morning). I don't know the exact cost of the amp, because I bought it together with a used Les Paul copy for a total price of $250. I am guessing the amp price was $125.

The original single Fender 5" speaker did not produce enough lows, so I bought 2 Fender 10" speakers and built a new case for the amp chassis and the speakers. The hardest part was covering the wooden cabinet with black tolex using contact cement. I also re-tubed the amp and swapped out the 6V6 power tube with a 6L6 for more power. I still have the replacement 6V6 tube and I sometimes install that for recording. It is a NOS from 1954.

The picture of the Sovtek Tube Midget was just thrown in there for no reason other than it is kind of a cool amp. I haven't done any modifications to it.

Here is the link to my pictures:


Someone let me know if the pictures are showing up, as I am not too familiar with the privacy settings for albums on Imgur.
"Whiskey Bottle...Brand New Car...Oak Tree You're in my Way" RVZ

Pro Tools LE 7.4cs10, Windows XP Home SP3, AMD Phenom II 1045T Processor, Digi 002 rack , Command 8, Behringer ADA 8000, Tascam M-320B Mixer, Alesis Monitor Two Speakers, Vintage and Modern Tube Amps, Fender American Strat, 1973 Gibson SB-450 Bass, Epiphone Les Paul Traditional Pro, Roland W-30 Keyboard, Preimier XPK Fusion Drum Kit.
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