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Look at Herbert Keroes original circuits.

Posted by grhughes on December 4, 2004 at 07:23:16:
Herbert Keroes was the brain behind the original dynacos. In the early fifties, he developed several amplifier on the Williamson vaiant. One of which used all 6sn7 as both the input amp and the phase splitter. Some of these are in the AUDIOCYCLOPEDIA by Howard Tremaine and others were in print in magazines that I have. Look around for some Peerless transformers on ebay or buy your new ones from Mikey at Magnequest. The 7591 is Ok but there are many more good tubes. The Mac circuits used trifilar and quadfilar and pentafilar primaries and most transformers makers today don't want to go to that much trouble. In fact you won't find any! Altec also marketed some very good amplifiers and later bought Peerless and used their transformers in their amps. These were sold both for commercial sound installations and mo pic theatre. Ampex also used Peerless trannys in their theatre amps. Ebay is the first place to look for original iron. RCA used Langevin trannys in some of their theatre amps and UTC. The 6L6Gc is the universal tube used in most of their 30 watt amps and will be manufactured 20 years from now if we keep the faith. The 807 is a very good tube and was a transmitter tube used in theatre audio amps. The 6550 triode connected is also very good. Good luck! Ray Hughes