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Original Message
RE: TubeCad Error re: LTP?
Posted by Triode_Kingdom on June 11, 2021 at 07:13:11:
"a perfect CCS with identical tubes would result in the need for matched resistors."
First, the article says the opposite - that even with the CCS, the resistors must be different values. That's the error.
Second, the tubes don't need to be identical. If the CCS is perfect, the AC signal current will be equal and opposite in the two triodes regardless. Only the presence of grid current can change that. One could be a 807 and the other an acorn tube.