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previous: niek I am quite pleased about my Champ c... -- 9/8/1998 2:35 PM

Re: Champ improvements

9/11/1998 12:48 PM
Craig	Re: Champ improvements One thought would be to consider your power filter capacitance values. Generally speaking, more filtering creates tighter, deeper low end. I recently rebuilt a small Kalamazoo 'Champ-type' amp (5Y3/6BQ5/12AX7) and went with 80mmf for the 1st stage of filtering (the one that feeds the center tap of the output transformer). Great low end. There are limits, however. I have heard it said that in general, no more than 100mmf for filtering the B+ supply. But look at schematics - in particular, check out the Mesa-Boogie and Dumble pages in Pittman's book. There are apparently acceptions to this rule of thumb. Good luck! Craig

9/11/1998 12:48 PM

Craig

Re: Champ improvements

One thought would be to consider your power filter capacitance values. Generally speaking, more filtering creates tighter, deeper low end.

I recently rebuilt a small Kalamazoo 'Champ-type' amp (5Y3/6BQ5/12AX7) and went with 80mmf for the 1st stage of filtering (the one that feeds the center tap of the output transformer). Great low end.

There are limits, however. I have heard it said that in general, no more than 100mmf for filtering the B+ supply. But look at schematics - in particular, check out the Mesa-Boogie and Dumble pages in Pittman's book. There are apparently acceptions to this rule of thumb.

Good luck!
Craig

Replies:

Charles > There are limits... no more than ... -- 9/11/1998 3:18 PM