Choosing choke valuein pre amp tube

[ervinl]

Hi,

Is there any best practice to choose choke value for pre amp, for the first stage (right after tube rect), the 2nd (next), and the 3rd?

Or could we just generalize, the higher H the better? What about the sonic impact?

I currently install 1 of 72H of choke (26+46), and there is no hum anyway, with C (PP 18uF) L (72H) C (elco 100uF JJ) R 270ohm C (elco 100uF JJ) . Just curious if I change to L (?) - C - L - C - L or R - C (PP) could I get better sonic improvement.

Trafo output is 240V. Current consumption - currently - is about 20mA (2*10 mA). But plan to add another stage (could raise to 60mA total). B+ is around 220V (not ciritical, could be 180-250).


Thanks,

Ervin L

[Bas Horneman]

Hi Ervin,

The best would be to just try it for yourself. Maybe model it in PSUD. And then try to find some kind of correlation between what you are hearing and how it models.

Generally I find there are no rules of thumb. Such as the higher H the better. There are other parameters such as the C and R of the choke. Etc..etc.