Hi,
for my question to Musikding I was directed here, although my amp project is not a MADAMP (sorry...) I'm trying to build a semi-copy of the Peavey Classic 20 amp, for use at home. Here's the schematic. I've identified all parts but I'm still in doubt about the power transformer. So I asked Peavey, and this is their reply:
BE-28733 Domestic Power Transformer
Used: New Classic 20 Tube Amp
370VDC @ NL
325VDC @ 30 mA
313VDC @ 100 ma
6.3 VAC @ 1.2A AC
So then I thought:
370VDC = 261 VAC @ NL
325VDC = 230 VAC @ 30 mA
313VDC = 221 VAC @ 100 mA
The NL (no load) is not too important, I think, since it seems the voltages mentioned by Peavey are after AC/DC conversion and stabilisation. My guess is the 30 mA is with the amp switched on but no signal, and the 100 mA is with the amp switched on and at max output. All this leads me to believe a simple 230VAC / 230VAC transformer should suffice, of course equipped with a 6,3VAC for the tubes.
Now for the question: I've only built from schematics before, knowing all parts in advance. The above is just a guess based on my limited knowledge. Does it make sense? Should I go for the 230/230/6,3? Or did I miss the point and am I talking nonsense?
Cheers,
Hugo