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Originally Posted by frenchy
On the ctc-10 it is just wired in series with the main voltage coming out of the transformer and into all the filtering caps etc.
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Frenchy. Are you sure the device is wired into the secondary somewhere? Looked up the original schematic that came with the CTC10 and couldn't find it. Found the CTC10 RCA service literature and ditto, but I could have missed it.
Had to replace the Thyrite in that set in the latter sixties and I'm pretty sure it went in the primary of the power transformer. The fils are definitely in the loop because as I mentioned somewhere earlier, it takes the pilot lamp two seconds to ramp up to full brightness.
Pete