09-10-2014, 09:03 AM
Interesting.
This is just my guess at the moment:
It looks the same as the SFM 11 as shown on the radiomuseum site, if it is then I don't think the last IF valve is an EFxx type as the valve shown in their pic is shorter plus the fact that the valve base pin out shown in your pics doesn't seem to tally up with any EFxx series valves. I'm wondering if it's an ECF80, the pin outs seem to tally up better, the triode section being used a a cathode follower, that might account for the twin phono output sockets eg: high imp, low imp.
The discriminator looks like a Foster Seeley judging from the orientation of the germanium diodes.
Lawrence.
This is just my guess at the moment:
It looks the same as the SFM 11 as shown on the radiomuseum site, if it is then I don't think the last IF valve is an EFxx type as the valve shown in their pic is shorter plus the fact that the valve base pin out shown in your pics doesn't seem to tally up with any EFxx series valves. I'm wondering if it's an ECF80, the pin outs seem to tally up better, the triode section being used a a cathode follower, that might account for the twin phono output sockets eg: high imp, low imp.
The discriminator looks like a Foster Seeley judging from the orientation of the germanium diodes.
Lawrence.
