Tube Amp Archive

Wanted to follow up on this thread. Finished the amp about a month ago and have been getting acquainted with it since. Ordered a new Hammond choke after my last post. I had initially put it together with the choke I had on hand and it tested out OK. Swapped it out with a 4HY,90mA replacement once it...

Good point. This Twin has less passing through the choke so I suppose Fender could have made some economy by sizing it to 50mA. For comparison, I popped under a 65 Twin Reverb and noted it has a 036486 which Hammond specs as 4HY,90mA. I'll probably want to add their 194B to my next Mouser order. Tha...

Thank you for the quick replies! There is a lot I'm misunderstanding, I'm sure of at least that :) I've already removed the HI (100W) / LOW (25W) switch from the circuit. So it's not in play at this point. When I connected the center tap RED/YEL to ground, and the two diodes in series on each leg of...

I'd like to build this amp and would like to use a Fender "The Twin" as a donor (the maligned Red Knob Twin.) I have a question about how I might modify the design to use the power transformer from that amp for this build. It seems this amp calls for a 660 VCT power transformer. If I understand corr...