I rebuilt this stage and it’s OK now with a 6SN7. I haven’t found a faulty resistor, so I haven’t found a real cause. My B+ is 600 VDC, with 400 VDC for my driver and phase inverter. All regulated and very stable.
Next thing is to compare this phase inverter with a MOSFET phase inverter. Balance with the directly coupled MOSFET stage seems to be even better. Still work in progress!
Regards, Gerrit
Next thing is to compare this phase inverter with a MOSFET phase inverter. Balance with the directly coupled MOSFET stage seems to be even better. Still work in progress!
Regards, Gerrit
Called it.I rebuilt this stage and it’s OK now with a 6SN7.
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