I thought I had this worked through but I've noticed after most of a days run the left channel which I'll call tube socket B is causing the tubes to be microphonic and have a considerable amount of tube rush.
I have to confess I'm not working from the appropriate original manual but I do have the Extended Foreplay 3 manual. Can't find my original manual but I have the manual with the OD3 regulator.
At any rate everything and I mean everything in the Extended Foreplay 3 manual checks out beautifully well within 10% for voltages and dead money on resistance.
The Ext FP manual says the voltages on A and B tubes are the same as the original manual. I of course don't have the original manual so here's what I have.
A
1 - 83.6
3. - 1.536
4 - 31.41
5 - same
6 - 150.5
7 - 83.2
8 - 83.1
9 - 27.38
B
1 - 93.2
3. - 1.536
4 - 31.47
5 - same
6 - 150.5
7 - 89.2
8 - 89.4
9 - 27.38
So you can see I'm running a little hotter on 1, 7, and 8 on the B channel but a little hotter than 10% on the 1 pin.
Ok here's the oddball thing. Started getting my tube rush out of the left channel so I shut down. Ran through the checks, swapped the tubes from side to side and fired up again. Floor noise in both channels is what I'd call acceptable. So apparently a cool down did me some good.
What would cause my left channel to run hotter and have tube rush? This has happened on a couple pairs of tubes.
All my LED's are glowing wonderfully and steady. Music is outstanding beyond belief but I'm worried I have a tube killer here.
Q2 on the C4S board?
John