Quote:
Originally Posted by DonaldStott
At the top/middle of the second picture is the underside of V2 which is the 9-pin Mullard ECF82 which replaced the 7-pin 6BE6. Very busy in there although I'd like to discern what's connected where and how this differs from what is shown in the Service Sheet 1233 for the MR10. Just for my own knowledge and ongoing understanding.
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In the 6BE6 version the 6BE6 operates as a heptode (pentagrid) oscillator/mixer, in the ECF82 version the ECF82 operates as a triode pentode oscillator/mixer, both use the oscillators cathode circuit for regeneration to maintain oscillation.
The circuit differences are shown in the manufactures MR10 schematics which are available from Mike's (Crackle) KB museum web site.
Lawrence.