An uneducated question here.

I am looking for advice from people who have had some experience with filament choke and filtering schemes for an amplifier front end or phono-pre use.

I am looking for a good filtering scheme to reduce the ripple and to prevent negligible problems associated with such a filter.

My question is based on a single stage AC heated 6SL7 in the front end of a P-P monoblock amplifier. The filment would be supplied by a seprate transformer per stage.

Would it be best to use a LCLCRC filter in one leg of the filament supply, with small hash chokes of 250uH, 20uF film caps AEON, and a variable resistor of small value? Or, use an LCLC in a common mode scheme with above chokes and capacitors?

I am afraid that a large filter capacitor with a high ESR rating would cause some problems with high frequency noise and charging-timing issues.

Any comments, or opinions about filament schemes are most welcome.

Thanks

Norris Wilson

I said this was an uneducated question, maybe a little silly too.

It came to my attention that I proposed a filter for DC components.

Do you have any suggestios that would filter an AC filament supply?
Possibly the use of hash chokes in both legs of the heater supply?

Any suggestions of the type of filter, or text reference would be most helpful.

Norris