Lessons learned building this amp
#1
Always connect the transformer to the right connections, on accident I connected to the 2.5 watt connection on the 20v side not the 70v of my line transformer.. Well let say It lets the smoke out
#2
create sokets for the tubes using this type of 8pin dip -->

as the tubes make better connection than with the spring type
I used the spring type for connecting to the board as you can see from a picture earlier in the thread. I would get lots of oscillation until I double socket-ed them, I am sure if you used non sprint types in the beginning you would have the better results..
#3
This amp is louder than you think, I need to do some measurements, but I am sure its close to 1.5 watts, maybe 2...
#4
try different tubes, the 6111 in the power position stays cleaner but the mode for bias control between 820R and 4.7K does not do much
6021 well they add overdrive of their own, and sound good, but so far they really go into oscillation, but that may be the batch I got.
6112 is a good preamp, but gives horrible output in comparison to the others. Its quieter than the 6111, I think that is due to current sourcing..
I believe my IRF740 was damaged when I hooked up the transformer wrong, it was the only time this thing get hot for me.. It smoked a little before I hit the power switch, but it works at 165v 6111 and 170v with the 6021 in the power amp section, but any higher and it starts to tremlo.. so I should replace that and test again.
I get lots of ground noise, buzzing and such, with the 6112, 6111 combo its not bad and is not as noticeable. I know I am getting oscillation but I need to connect the scope, may be after vacation when I box this up.
one for the tube glow..
