Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: chocopower on November 14, 2014, 08:31:28 am
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Hi there!
I friend of mine have this old Gibson amp. Lot of problems with noises, reverb transformer dead and he really don´t like the "too clean" sound.
Is a really hard to work amp. I think you call "spaghetti wiring". Anyway, i decided to take all out and rebuilt it from cero.
I attached the original schemo (really similar to the GA35RVT you have been talking about last weeks) and the new schematic i´m gonna try.
Some values like coupling caps and power rail resistors are just theorical and i´m sure i have to tweak them when amp is finish.
I´m looking for any safety advice or any other idea about doing things in a different way.
Right now, im gonna keep the 7591 as power tubes cause i already have them in the amp and the are almost new JJ. When those tubes die, i think im gonna try to re-wire to 6L6, as PRR said in the GA35RVT topic.
Thanks in advance!
** Sure someone is gonna say something about the weird tone controls, but i wanna use the stuff i already have into the amp, and anyway, those tone controls aren´t useful below 12:00 o`clock with the classical 1M pot.
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Your schematic looks OK to me. I would build on a turret board because that makes it easy to change components if necessary. True point to point wiring (spaghetti wiring) is more difficult to change components.
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Thank Sluckey!
That baby already have two small boards, but in previous works someone make a really weird wiring leaving some areas and components bypassed and using wherever he found to attach components.
I going to use them in the right way. I´m working in layout (hand-draw, sorry) and i´ll post it as soon as possible asking for some corrections.
thanks!