Voltage across 20K 109V, across 30K 165V
N.B. measurements done only with one rail 20K & 30K connected.
N.B. measurements done only with one rail 20K & 30K connected.
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Can't be used CCS+Gyrator with OPTs? If can't be used I have to buy a new box and use SSHV2.
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Lets do the math first.
So what do we know now? You have 165 volts over a 30 k resistor that ties B+ and ground together. Thats the simulated audio circuit.
Ohms law says U=R*I or the other way I=U/R
165 Volts divided by 30 000 ohms is 5,5 mA
We can check this over the 20 k filter resistor also since all current passes that one also.
109 volts divided by 20 000 ohms is 5,45 mA.
If you should now plug in a tube, biased at 5,5 mA (bias is controlled by the resistor between cathode and ground in the relation to B+) you should now have 165 Volts B+.
Are you with me on that? Shall we try?
So what do we know now? You have 165 volts over a 30 k resistor that ties B+ and ground together. Thats the simulated audio circuit.
Ohms law says U=R*I or the other way I=U/R
165 Volts divided by 30 000 ohms is 5,5 mA
We can check this over the 20 k filter resistor also since all current passes that one also.
109 volts divided by 20 000 ohms is 5,45 mA.
If you should now plug in a tube, biased at 5,5 mA (bias is controlled by the resistor between cathode and ground in the relation to B+) you should now have 165 Volts B+.
Are you with me on that? Shall we try?
Ok, can you parallell the 20 k with something like a 100 k, or change it to something like a 15 k? And measure drop over "the new" 20 k and B+ on tube? Measure the new resistorvalue in ohms to plz.