I took the datasheet from Telefunken and made some "adequate" models for the line amplifier featured in LinearAudio V. 6. I don't have the ECL113, but do own some compactrons sharing the same features:
I tried the "Boosted Triode" shown in the article -- the device is a 6SN7GT -- the dotted lines are operation in boosted mode. I didn't want to run the tube with more than 50mA:
An externally hosted image should be here but it was not working when we last tested it.
Because of the load-line, the boosted triode amp will require you to wind your own transformer -- just like the early 1960's:
An externally hosted image should be here but it was not working when we last tested it.
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