Tube Amps / Music Electronics
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|7/11/2000 12:25 AM|
hello everybody, ijust picked up an old gibson hawk GA 25 RVT at a yard sale complete with 7591 uotput tubes and 2 10 inch speakers.it was only 33 bucks so i had to give it a good home.any way, i think the output trany is blown and was searching for a schematic but cant seem to find one anywhere. if anyone could help me out i would be very greatful thanks bill
|7/11/2000 4:50 PM|
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The Ultimate Tone, Volume III by Kevin O'Connor
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|7/11/2000 9:07 PM|
Don't know about the output tranny but these amps often blow the PI/driver tranny - Antique Electronic Supply has one that replaces it well.
|7/11/2000 9:36 PM|
I think it is only the GA20 RVT that has the transformer PI. And that schematic is from a 50's model that bears little resemblence to the RVT...
|7/12/2000 12:12 AM|
I had the model RVT30A Hawk amp. It had a transformer PI and it opened up on me. The 12AU7 plate winding opened and the local tech used a 120K resistor and a .01uF cap to get it working again. Didn't change the sound. FYI
|7/12/2000 2:53 AM|
The transformer coupling seemed to be an integral part of the Gibson sound until the late 60s - every one I've worked used the tranny. It certainly shapes the sound and, to my ears, nicely - gives a distinct tone.
|7/12/2000 11:57 AM|
I seem to see a fair amount of Gibson amps, maybe it's being in MI? The only amp I recall having the transformer PI was the GA20RVT...I have a mid '60s GA45 RVT and a couple of '50s Gibsons in the shop currently, and these do not have coupling transformers for the PI. I personally think the '50s and very early '60s Gibsons are among the finest sounding amps ever...but by the time they put black tolex on them ('64?) they had become terrible sounding.
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