SpiderWars
Well-known member
I built a Valvestorm '68 Superbass last year but I hate going back and forth between biasing it for 90vac (variac use) and 119vac (my Furman voltage). So I'm building a '69 Superlead for variac use and the Superbass will be the 120v amp. Still with laydown PT but slightly higher B+ (480vdc vs 460vdc) and with filter cans (ARS). And a 2" OT instead of the standard 1.5". But I don't think it is a Drake type, more like a 2" version of the 1.5" Dagnall and still 1k7 primary (not 2k2...long story apparently on that). 3.8H choke. All iron from Mercury. The OT is usually oriented 90* from the Superbass but the 2" thickness forced me to orient it the same. But the OT/PT are spaced even closer together in the SB because there is no garden of filter cans in between so I think it's a non-issue.
My Superbass had non-twisted filaments so I'm doing it that way again. I really don't think it makes a difference in noise and way less wire (which is probably one of the reasons it probably doesn't matter, the untwisted length of wire is almost the same but there is no twisted-pair length running along the back). And it leaves the left end of V1 (the most sensitive area) with zero filament wire to cross, totally open end there.
My Superbass had non-twisted filaments so I'm doing it that way again. I really don't think it makes a difference in noise and way less wire (which is probably one of the reasons it probably doesn't matter, the untwisted length of wire is almost the same but there is no twisted-pair length running along the back). And it leaves the left end of V1 (the most sensitive area) with zero filament wire to cross, totally open end there.