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Comments
Still a nice amp though, shame I don’t get to play through it much these days ...
Single 6L6 with like a Champ circuit?
This sort of thing is not unusual as component manufacturers have always provided example circuits for use with their products, and I'm sure you'll appreciate if you look at the data sheet for any op-amp or voltage regulator.
However Fender quickly updated their designs bringing out new models every year, so the classic 5F-6 circuit is really very different, and contains features unique to Fender, eg the tone circuit, that have now become "standard" on virtually every other guitar amp.
That tone stack, as far as I can tell, was developed by Fender. I can't any similar circuit in the 50 or 60 odd pages of tone circuits in the RDH4.
Not sure about the Champ circuit, but the very first Champ was so simple, around 25 components or so, that it would be very difficult to build a working amp using any other circuit.
Fender construction from the mid 50's was very very consistent, which was due to Forrest White who joined Fender in 1954.
Marshall on the other hand, as I am sure you know, in the beginning used to buy all their parts from the RS shop on Tottenham Court Road, and construction was pretty hit and miss.