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RE: other circuit mods...

Doug
I don't how to convince you but there is no voltage gain in that output stage. The cathode windings are in parallel and you cannot add the voltages measured in parallel. This was confirmed by Doc Hoyer and another MAc winder as well.There is 325vac at the grids of Mc60s when you run the amp up to 60 watts.A 2 to 1 ratio would take that to 650vac.I get the output looks like a concertina but cathode windings would have to be in series in order add them and they are not. Being Hoyer winds the transformers daily,I'm pretty sure he knows what he is talking about.
Here is another way to figure. The step ratio of an Mc60 output trafo is 14.9 to 1 at the 8 ohm tap. There is 325vac coming in between the G1 at the 6550s. 325 divided 14.9 equals 21.8. Square the 21.8 and divide by 8 ohms and you come out with 60 watts.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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  • RE: other circuit mods... - Michael Samra 01/18/1716:14:53 01/18/17 (4)
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