Re: Ferguson 204 XL wireless
Agree about the bias requirements on the 6V6. I did once try it (in a wartime civilian wireless) when I was about 15. It did "sort of" work, but there was obvious distortion.
As to the true original valve line-up the only way to be sure is to unearth some service information. I couldn't find anything on it, hence my posting here.
C
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