03-06-2015, 08:43 AM
Hi Mark & Welcome!!!
Well let me see the round thingy is the inductor for IF the wave trap. The square thingy is a can with bypass condensers usually 3 or 4 inside. The autodyne circuit was used because the pentagrid tube wasn't designed yet. Remember this 1931-32. It was also cheaper as it only use 1 tube instead of 2 (separate mixer/osc tubes).
You can expect to rewind the feedback winding on the osc coil. Very common problem but easy to repair. The bad feedback isn't because of the type the mixer it's a chemical/old age thing.
Terry N3GTE
Well let me see the round thingy is the inductor for IF the wave trap. The square thingy is a can with bypass condensers usually 3 or 4 inside. The autodyne circuit was used because the pentagrid tube wasn't designed yet. Remember this 1931-32. It was also cheaper as it only use 1 tube instead of 2 (separate mixer/osc tubes).
You can expect to rewind the feedback winding on the osc coil. Very common problem but easy to repair. The bad feedback isn't because of the type the mixer it's a chemical/old age thing.
Terry N3GTE
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