Steve,
Yes, I'd like to do this comparison when I have time. Finally a reason to use 2SC5551's that you sent me a while ago :)
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Martin,
This preamp is a 50 Ohm in/out Norton push-pull, the only variation is the output transformer.
Wellbrook loop is a low input impedance and a different topology: the feedback/augmentation is part of the input transformer, and the output transformer is for differential to single ended conversion only.
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73, Mike AF7KR
