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My friend has forwarded a D3a transformer coupled circuit to me and I have few questions would like to ask.
Assume the grid stopper is remained the same at 1K, and the B+ voltage is 180v instead of 160v, the cathode resistor is raised to 110 ohm, and the load impedance of line output transformer is 10K rather than 20K.
Do you think the current capability of the line out transformer is necessary to handle 20mA?
Are you asking whether or not your OPT needs to handle 20+ mA?
If you are also asking if 10K is enough of a load for the tube, yes 10K should be enough.
Make sure the OPT you select has enough inductance for the tube.
However, I want to try another approach with D3a coupled and see which one sounds and preform better.
I found the Conrad Johnson ART circuit somewhere within this forum and I want to know whether any possibility to replace the 6922 with D3a (in triode). I guess the circuit end up less tube as D3a has less resistance and lower impedance than the 6922, so how many D3a require to achieve the same level of output impedance of 10 x 6922 triodes???
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