I found some rather interesting power trannies, for cheap, on the e-place, these are fairly hefty 120Watt rated power trannies, with 235VAC, 44VAC, and three 6.3VAC filament windings. Designed to be used with a voltage doubler for around 600VDC B+, or with a bridge for around 300VDC. Price, a princely $20 each. Made by Woodward-Schumacher in Chicago. I couldn't resist, went for two, the shipping is $11.70 for the two.
http://cgi.ebay.com/NOS-POWER-TRANSFORM ... 4aa4785cd2
THIS AUCTION IS FOR A NEW OLD STOCK TRANSFORMER FOR A TUBE POWER-AMP. PROJECT. IT HAS A COPPER FLUX SHORTING BAND. DUAL PRIMARY. IT'S SECONDARY VOLTAGES ARE, RED to RED 235v NO CENTER TAP---BLUE to BLUE 44v --- GREEN to GREEN 6.8v with C.T.and THICKER WIRE ---YELLOW to YELLOW 6.8v ---ORANGE to ORANGE 6.8v. ALL VOLT VALUES UNLOADED. Not knowing the specs on this transformer. I proceeded as follows.
I loaded the secondary red winding to 200 ma. and filament green winding to 6 A. The voltages are now 607 VDC and 6.3 VAC., for 8 hours to check for temperature rise. I did not load the YELLOW or ORANGE winding thinking they are for tube rectifier filaments which probably no one will use, and BLUE is only for negative bias. I had a 35 degree C rise in primary temperature..DIMENSIONS ARE 3 1/2 x 4 7/8 x 4 1/4 HIGH
He also has another version with a 170VAC HV winding, which can double for 440VDC or bridge for 220VDC. Good for those big 6EM7 / 6GF7A designs, this beast could easily run 8 of them... or 8 to 12 6BM8s
I think the postal delivery woman is gonna be cussing about when this heavy package arrives. Couple of ten pound chunks of USDA prime grade "pig iron" in a flat rate box... I'll file them under the Herniator and Gut Buster categories
/ed B