Saturday, December 1, 2018

AKG circuit for 6072 electron tube low noise selection tests


Cathode resitor 2K7 in parallel with 33μF.


Grid to ground resistor 200MΩ in parallel with 200pF.


Anode resistor 100K (this should be a low noise one?).


1μF capacitor from anode to primary of a 10:1 output transformer. Other side of primary to ground. Secondary is connected to to a 60dB amplifier. (A psophometer should be great too?). Then there is a Sennheiser UPM550 filter.


The cathode of the other triode section is shown connected to ground.


Ug max 3.8mV eff.
A weighted Ug Max 2.5mVeff, 1.9mV eff normal?







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