01-09-2022, 08:25 PM
I have sorted the instability issue now, it didn’t need the de-coupling capacitor, it was a minor wiring error by me…
The grid 2 voltage is better now at around 163v, anode voltage is still around 170v so I might have to look at r22 again, I did mean in series Trevor. I have already replaced c45 but might look at moving it, if upping the cathode resistor increases the anode voltage then I will leave it, its nearly up to its limit already. I haven’t replaced the grid coupler as yet as it a mullard mustard type, ive not come across a bad 1 yet, voltage on grid 1 is +12mv, all voltages are taken with the DMM. C44 has been replaced.
The grid 2 voltage is better now at around 163v, anode voltage is still around 170v so I might have to look at r22 again, I did mean in series Trevor. I have already replaced c45 but might look at moving it, if upping the cathode resistor increases the anode voltage then I will leave it, its nearly up to its limit already. I haven’t replaced the grid coupler as yet as it a mullard mustard type, ive not come across a bad 1 yet, voltage on grid 1 is +12mv, all voltages are taken with the DMM. C44 has been replaced.
