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The Hitachi transistors I went with are those recommended by Jim Williams: 2SC2545 NPN http://www.datasheetcatalog.org/datasheet/HitachiSemiconductor/mXwvrxu.pdf and 2SA1083 PNP http://pdf1.alldatasheet.com/datasheet-pdf/view/62792/HITACHI/2SA1083.html They make a huge difference - when comparing an...

I don't know about a whole board, but when I racked my PM1000's (4 channels in one case) I just used the 44v for the phantom supply. There might be some devices out there that won't work at 44v, I suppose, but as far as I know it's not a problem. The lower voltages could be arrived at using a volta...

I have what is probably a stupid question about powering the PM-1000 (full board - 16 channels - soon to be completely recapped w/ some mods)... I had the internal PSU recapped and I've experimented a little with extra films for bypassing, but I'm still curious about how a newer linear regulated sup...

Speaking of bulbs, would anybody happen to know what type of bulbs the PM-1000 VU meters take?