I recently received a broken SE-40 amp. It had been in a basement for a few years after malfunctioning until I ended up with it.
I found the Sonic Craft mod after doing some research and decided to get the REL+ kit in hopes of getting her up and running. The kit was really well put together and documented. It was a pretty simple, if painstaking job. The hardest part is removing so many components without causing damage to the board or grinding your teeth to dust. At this point, I've installed the modification and I have some new 6sn7's on the way. In the mean time, I tried to bias the amp with the existing 6sn7's and some 5881 power tubes I had. Here's where I have some issues.
There is a separate bias pot for each tube, which I assume means I can use non-matched tube sets, correct?
I'm getting 0 volts when trying to bias v8. I assume that means that I've burnt out r25? I might have gone over the rating or rotated the knob all the way in the wrong direction to start the bias
- it's been a few days, I can't remember exactly. I did try with a different tube and still 0 volts. The rest of the tubes are fine.
I've got some 5881's, 6l6's, and a set of KT66's, though I'm not sure which manufacturer at the moment. If I want to try tubes other than the 5881, how do I know what the bias reading should be? Am I always aiming for the .605v range, or does it vary from tube to tube?
Thanks in advance for your knowledge and help on this. I'm excited to hear it.