Power Transformers in early Dual Rectifiers

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Dr.G

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Feb 7, 2012
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Hi there,
so I was reading the www.rectifierguide.com and saw, that the very early Rectos had different power transformers. They were changed form 561137 to 561140 somewhen in the transition from Rev F to Rev G.
At one time I had the chance to have a Rev C and Rev G to compare and I did check the bias reading as well as the plate voltage on both amps.
The Rec C had a slightly lower plate voltage around 420V whereas the Rev G had a reading of 450V.

So what do you think, are the different power transformers possibly provide different plate voltages?
 

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