I mean, if we care about if a toob or toob sample has 1,7 or 2,4 pF Cga and it differs 2 pF on how the wiring is made...
The internal figure is going to multiply with gain, the external parasitic will just add
Some voltage across the diode, yes. Since the current there is low it won't be full 0.7V that is why we may use IR LED or two diodes if the tube sample don't go very little mV across open input.
Right channel 0.582VDC
Left channel 0.577VDC
Have I to add other diode 1N4148 in series?
Sounds better but still needs more gain, with step-up Jensen + Denon DL103R (R.I.P.) volume setting was half volume, now to start to listen music I have to set to half the volume attenuator & near full volume to have the same gain than Jensen+Denon DL103R (R.I.P.) of course full volume I have noise so not pleasant, with step-up listening setting was half volumen.
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