Re: Thought this might amuse you...
Re David's comments (above), in the late 50's and early 60's when flywheel sync and gated A.G.C. were beginning to be become popular design features a lot of the "Old Timers" found it difficult to grasp this new technology, with gating pulses and such exotic fripperies.
I met quite a few sets where an A.G.C. fault had been masked by replacing the contrast pot by a 5 or 10k pot in the cathode circuit of the first I.F. stage. Even more evil bodges were done to get round flywheel sync problems, usually involving mica "pFs" strung around the circuit to enable direct line sync (of a sort) to be achieved.
Luckily, most of these old timers and the "valve jugglers" (who often knew even less) recognised their limitations, and gave up, and several I knew ended up happily doing irons/toasters and radio repairs, as there was quite a large repair market still at that time for those items.
Tony
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