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In Reply to: RE: 1959 Ampex 6973 Monoblocks posted by rlschow on April 29, 2010 at 08:17:46:
Nice score! Be careful using the 6CZ5. The schematic has 345V on the plate (B+ = 375), but when I measure mine the plate voltage is actually ~360V. That's OK for the 6973 since it is rated for a 440V max plate voltage. But the 6CZ5 has a max plate voltage of 350V, so you will be pushing the limit there. I don't know why but the EH 6973 tubes look much smaller than NOS. I use K40-9y caps in mine. They are killer amps for sure.
Dan
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