Tube Amp Archive

Thanks for all the replies, I really appreciate the help. With respect to the biasing of the amp I'm used to biasing each tube on other amps I've had and don't quite get what the procedure is for paired tubes- if I adjust the bias it affects both tubes so should I average it out between the 2 tubes ...

Thanks ToneMerc. Are these pots normally tuned by ear or value? Obviously I'm new to Dumble style amps so I'm trying to find my way with this stuff. If possible I want to be able to tune the amp myself instead of bringing it to a tech.

Thanks so much Structo- I will take a look at all of this and see where it leads me. The Little Dummy has from left to right the following controls: Send pot, bright switch,recover pot, return pot, bright switch. It seems like these would correspond as send is send, recover is return, and return is ...

Here is a partial gut shot. Front of amp is towards the bottom of the photo. 3 small pots in the middle are the HRM EQ pots. It's the other 4 I'm wondering about- 3 vertically mounted and a smaller one horizontally mounted. Thanks for any help identifying and advising on adjustment of these. [IMG:10...

Can anyone help me out with biasing this amp- tubes seem to be paired. Is there a way to bias each tube individually? Have a matched quad but one tube is around 29mv and the other at 32mv. The other 2 match perfectly and are set at around 32-33mv. Also internal pots I know where the HRM eq pots are....