Tweet
OK, here's the story...
Was at a party at my wife's uncles house. We got to talking about tube amps. He brings me to his shed out back to show me a custom amp he made. He couldn't remember when he built it, or find a schamatic on it...then gives it to me. The size of the tranny's alone was making my mouth water! Due to the Bumblebee caps, and the tube dates, it looks to be around '58 to '60 when he made it. He claims that it was his original design (the guy is a retired EE the worked at Argonne national labs...so this may be truth).
It has a single 12ax7, twin 6V6's, 5v4ga. I have restored a few guitar amps from schematics and such...but this is a little over my head. When I first got it, I wired in a 1/4" jack and hooked it to the P12R in my Princeton reverb cabinet...it's a very quiet amp, with very low gain. I hooked a EHX Big Muff before it and cranked it up...sounded great. Slide guitar in this tune was done with it:
SoundClick artist: Ron Vogel - One man band (slide comes in at 1:38)
I want to make this into a guitar amp now, and build a cab for it. I want to utilize the exsisting 12ax7 as the first gain stage, add in a volume control. Then add a second gain stage/tone stack with the schematic included below. I spent all morning drawing out the wiring and trying to decipher the circuit. I also looked at a ton of schematics online to try and find something similar he may have based this on, but can't. I can't tell if this is a spud or a push-pull (he alluded it it being a push-pull).
Any help would be appreciated. I may just go ahead and replace several caps for good measure, although the amp works very well, and is very quiet. He also had a connector for a seperate preamp input that I will not be using.
Was at a party at my wife's uncles house. We got to talking about tube amps. He brings me to his shed out back to show me a custom amp he made. He couldn't remember when he built it, or find a schamatic on it...then gives it to me. The size of the tranny's alone was making my mouth water! Due to the Bumblebee caps, and the tube dates, it looks to be around '58 to '60 when he made it. He claims that it was his original design (the guy is a retired EE the worked at Argonne national labs...so this may be truth).
It has a single 12ax7, twin 6V6's, 5v4ga. I have restored a few guitar amps from schematics and such...but this is a little over my head. When I first got it, I wired in a 1/4" jack and hooked it to the P12R in my Princeton reverb cabinet...it's a very quiet amp, with very low gain. I hooked a EHX Big Muff before it and cranked it up...sounded great. Slide guitar in this tune was done with it:
SoundClick artist: Ron Vogel - One man band (slide comes in at 1:38)
I want to make this into a guitar amp now, and build a cab for it. I want to utilize the exsisting 12ax7 as the first gain stage, add in a volume control. Then add a second gain stage/tone stack with the schematic included below. I spent all morning drawing out the wiring and trying to decipher the circuit. I also looked at a ton of schematics online to try and find something similar he may have based this on, but can't. I can't tell if this is a spud or a push-pull (he alluded it it being a push-pull).
Any help would be appreciated. I may just go ahead and replace several caps for good measure, although the amp works very well, and is very quiet. He also had a connector for a seperate preamp input that I will not be using.
Attached Files
Comment