Silvertone 1474
Posted: Wed Nov 22, 2017 5:25 pm
So dude brings a Sivertone 1474 to fix. It's all stock. It does kinda work except for 2 burnt resistors and the reverb. It has a piezo reverb that they don't make any more. I've been researching and researching, and everyone just says to match your old reverb with a new one. Since I can't, I decided to rewire the circuit for either a 6CG7 or 6N1P driving a 8FB2C1B since it had the highest impedance (1925Ohms in). The Ampeg Gemini 1 used a 6CG7 to drive a reverb tank, but they didn't say what the impedance was.
I don't want to add another tube, just remove the 2nd 12AX7 and put in a 6CG7 or 6N1P, both can get down to 6.5KOhms internal resistance, with the 6N1P giving me a lot more gain.
Will the MOD 8FB2C1B that I already have mate up with a 6CG7?
Top picture is the Ampeg, bottom is the Silvertone.
I don't want to add another tube, just remove the 2nd 12AX7 and put in a 6CG7 or 6N1P, both can get down to 6.5KOhms internal resistance, with the 6N1P giving me a lot more gain.
Will the MOD 8FB2C1B that I already have mate up with a 6CG7?
Top picture is the Ampeg, bottom is the Silvertone.