10-10-2014, 02:31 PM
The pinout's on the mixer/IF valves in your Rogers suggest ECF80's, it might be worth reverse engineering to obtain the schematic if you can't get hold of one, you could start at either end and work back doing it in stages, the discriminator will be a bog standard or slight variation of a Foster Seeley as the two diodes are both facing the same direction, the only other design I know of with the same diode arrangement is a balanced slope detector, it's less likely to be the latter and almost certainly the former.
The IF amp and IF limiter will be bog standard stuff, the osc/mixer I'm not to sure about but it might be an ECF80 configuration, if it is then the osc will probably be the triode section, if the RF amp is an ECC84 then it's most likely to be a cascode jobie, a bit of reverse engineering should tell what's what.
Lawrence.
The IF amp and IF limiter will be bog standard stuff, the osc/mixer I'm not to sure about but it might be an ECF80 configuration, if it is then the osc will probably be the triode section, if the RF amp is an ECC84 then it's most likely to be a cascode jobie, a bit of reverse engineering should tell what's what.
Lawrence.
