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More Pwr and Headroom for SF Champ
Hi-
I'm new here - Happy to have found this site.
I have a SF Champ. I am looking for ways to increase the power AND headroom. Most mods seem to make things dirtier - I want to go the other way.
Heres what i have going currently (btw my guitar is an G&L ASAT w/ the p-90 style MFD pu's).
Stock 8" alnico spkr, 5V4 rectifier(for more headroom) 5751 preamp and RCA 6V6. Original filter caps - soon to be replaced.
The amp sounds great this way but the bass response isnt happening and the spkr while it sounds good lacks bass response and is a bit farty
I know replacing the cap can will tighten things up.
What about removing the feedback loop? With it add more pwr or just make things dirtier?
Same for tone stack? I like to be able to adj the EQ - at least the treble
does running the tone knobs at 10 achieve the same things as removing the tone stack?
I've heard some guys replace the 6V6 with a 6L6 for more pwr - but I've heard that its not good for the Pwr xfmr - I know to increase the voltage rating on the bypass cap to 50V if I do this.
Any other tube substitutions for more pwr & headroom?
I plan on replacing the spkr w/ either a 10" weber or 8" Jensen - are the MOD series decent?
I want to stick with the combo package - ie no separate cabs.
What about biasing? I know these amps are cathode bias but I suss that installing a variable bias control or biasing it a certain way is probably key to my achieving my goal.
Any info/help much appreciated.
Thanks in advance!
JPH
I'm new here - Happy to have found this site.
I have a SF Champ. I am looking for ways to increase the power AND headroom. Most mods seem to make things dirtier - I want to go the other way.
Heres what i have going currently (btw my guitar is an G&L ASAT w/ the p-90 style MFD pu's).
Stock 8" alnico spkr, 5V4 rectifier(for more headroom) 5751 preamp and RCA 6V6. Original filter caps - soon to be replaced.
The amp sounds great this way but the bass response isnt happening and the spkr while it sounds good lacks bass response and is a bit farty
I know replacing the cap can will tighten things up.
What about removing the feedback loop? With it add more pwr or just make things dirtier?
Same for tone stack? I like to be able to adj the EQ - at least the treble
does running the tone knobs at 10 achieve the same things as removing the tone stack?
I've heard some guys replace the 6V6 with a 6L6 for more pwr - but I've heard that its not good for the Pwr xfmr - I know to increase the voltage rating on the bypass cap to 50V if I do this.
Any other tube substitutions for more pwr & headroom?
I plan on replacing the spkr w/ either a 10" weber or 8" Jensen - are the MOD series decent?
I want to stick with the combo package - ie no separate cabs.
What about biasing? I know these amps are cathode bias but I suss that installing a variable bias control or biasing it a certain way is probably key to my achieving my goal.
Any info/help much appreciated.
Thanks in advance!
JPH
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