[quote author="Bjorn Zetterlund"]Right...some further experiments!
V1A
Plate: 160,158,157
Grid: 47,48,50
Cathode: 77,80,81
Node: 74,76,78
HT: 234,234,234
V1B
Plate: 83,78,75
Grid: 0,0,0
Cathode: 2.2, 2.3, 2.3
Having established that the results seemed to have a reasonable spread between different valves, I thought I'd try lowering the HT until the V1A cathode voltage dropped to 60, which would be acceptable for C7. I found that I had to drop the HT to 180 for this. According to the G9 schem, that would mean (245-180=) 65 volts dropped by R31, which is 1k...hence it must pass 65mA. But I just read in one of Jakobs posts to another G9 question that each G9 channel needs about 8mA, so something must be wrong here! I do use 6.3V heating, so it will be slightly hotter that the standard G9, but surely it can't be due to that? And should the 'node' voltage and the grid of V1A differ by about 28V? That would suggest a grid current of 27uA?
So just where am I going wrong with this :roll:
Bjorn
...and these DC readings do correspond to the values of one of my G9 channels posted over at RO.[/quote]
Hi,
I can read virtually the same voltages on my G9. Did anyone measure the correct values to read?
Thanks,
Val
:roll: