Re: Redifon MCU6B
The Redifon MCU6 was announced at the same time as the R499 HF receiver, see the attached WW 1986 June item.
There is probably some chance that the MCU6 used the same, or similar RF amplifiers to that of the R499, of the class A push-pull feedback type using RCA 2N3866 devices. So absent an MCU6 manual, perhaps the R499 (for which the manual is available on-line) might serve as a rough guide.
Cheers,
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