I s agree, just used a 250k pot. That’s not a critical area
I’m not doing this build but in a gain position you won’t find much audible difference if any. That’s a common substitution. There’s a difference between pure DC heaters and DC elevated. As for heaters the DC elevated is still AC heaters only with the center tap connected to an elevated DC voltage instead of 0V ground.Thanks for helping Scott !! did you just build an MTL clone too? i am currently sourcing parts here... maybe if you were to frequent here i can check out some of the things am unsure off? and mind to show any pics off your build? i kinda ran into some heaters idea which read over the net about DC elevated heaters and AC heaters twisted pairs for high gain like the MTL with AC twisted pairs be just find? the pictures Burger sent on the heaters wires arent even twisted !! wonder what magic or does should i conform to ie wiring layout?
Nice nice build !!I built a Superbass earlier this year (EDIT: lol, did it right out of the gate...I meant LAST year) and decided to try wiring the heaters similar to the way Soldano does the SLO (I also built a SLOclone about 15 years ago the same). Neither amp is noisy and I run the Superbass wide open into a PS-2 with a GEQ in front with slight boost. When I stop playing I hear some hiss but zero hum. Both amps have elevated heaters.
The heater wires are orange for preamp tubes and white/purple for power amp tubes. I like colors.
I’m not doing this build but in a gain position you won’t find much audible difference if any. That’s a common substitution. There’s a difference between pure DC heaters and DC elevated. As for heaters the DC elevated is still AC heaters only with the center tap connected to an elevated DC voltage instead of 0V ground.
250k pot is fine, don't stress over finding a 220k
If using my chassis, you want Alpha 24mm M8 shaft.
No worries!
My boards support setting up a DC reference for AC heaters....twisted wires not required imho!
just curious... and am a beginner here hope you can bear with me awhile.... the DC elevated heaters in ya design is tapped from the board name HTR near right hand side almost corner (1 green/white wire) that link to the centerpoint of the 6.3VAC heater supply from sec side of the power transformer?