I don't have the parts for a tube based DAC yet, but I made some progress in understanding the problem (I hope!) using ktechlab's current compliment. The first circuit is the stock I/V converter/low pass filter for a TDA1545A, the second circuit is a very crude/ameturish all discrete design...
Hmm, maybe we should create a ktechlab-users list too? probably not. the project is too small at this point. =\
I used the current-source to provide the bias current and then a current signal to simulate what I (think I) understand to be the dynamic DAC output.
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transimpedance.circuit
Description: application/circuit
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