Salas there is some self power consumption of reg. to work OK, I measure circa 650mA @ R1 ande the load is 600mA?
I have a suspicion this one at least maybe has a difficulty so compare with resistor plate load also for bias behavior
Can typically regulate even on such a small spare mA margin, eats only few mA for itself. More spare mA is simply burning it for better output impedance spec.
Ok I will compare vs resistor loaded to see how works t'he battery bias, 5K6 resistor, 200V B+ and 150V at anode?
Thanks now I am confident with the reg. for heaters.
Could I ask what do you think of bias point choosen or let me know what do you like more?
TIA
Could I ask what do you think of bias point choosen or let me know what do you like more?
TIA
Sounds like a good config to find the right -bias Voltage for grid at 9mA plate current so 150V on anode.
Vids with the dummy load, no oscillating. It's strange the cable is twisted and fixed to the chassis.
Near 800mA still oscillates, could be the issue Zobel network related, because several times the tester reads 1 or 3 volts: I said because the zobel used is 4.7uF in place of 10uF?
