H
harddriver
Well-known member
Power and Output transformers are Heyboer, The power is the dagnall clone dual voltage Metro and the Output Transformer is the Dagnall 1998C Heyboer clone. This amp is biased to run at 90ACV all the time. B+ is running 355DCV @90ACV. I'm guessing that I never experienced really bad graininess from the F+T's in the main/screens/PI because the preamp was running that 32uf/32uf Erie cap. Who knows?
Sometimes it's just a roll of the bones on how an amp turns out....
I had a Merren power and output transformer set sitting here for it for a long time, but I never did swap out the Heyboers and sold the Merrens.
The amp has aged well and seems to sound better now than when I first put it together.....maybe my hearing is just going........
For the 69 build I used a Magnetic Components/Classictone 40-18053 power transformer, the model with the copper band across the top of the lamination stack( this was the model designed to run cooler than the regular PT that all seemed to run hot, they kept saying it was normal...I did not agree so I ripped out the one that was running hot and the bias would drift as well) and the Heyboer 1998C OPT in my 69 build and that amp was a really great sounding SL and could do it all. Everything in the 69 build was NOS, Iskras, RS Caps, NOS paxolin reddish boards like they used in 69 and NOS Cinch ceramic 9 pin tube sockets. Here are some pics of the 69 build. I had two channels on the 69 amp, you had teh standard bright channel of the Superlead through the bright channel jacks and when plugged into the normal channel jacks you had the bright channel of a Super Bass but with a SL 33K/560pf tonestack. The 69 was biased to run at wall voltage all the time, it was my plug and play amp.
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I think that's the fastest I've gotten anything from California.