A little Surprising, CT100 Fans

[miniman82]

Swapped in the pair of transformers from the CTC-2B.....

....................


Nothing! Same result as before, so now I'm scratching my head because there's only 1 other cap and 1 other resistor in the whole oscillator. So while I'm sitting there wondering what my next move is going to be, I got a sneaking suspicion that something was staring me right in the face. I proceeded to put my DMM across the little inductor feeding the reactance tube grid and... INFINITE! Unbelievable! I swear this is the last time I ever trust these stupid little piles of crap, no matter how good they look. From now on, they will be replaced on sight no questions asked. I will install the rest of them from the kit I assembled later, since all I wanted to do up to this point is prove the chassis and tube worked well. Cabinet can now go off to the refinishing guy in Milwaukee.



After replacing the bastard little inductor, the scope showed that the oscillator now worked as it should. No more mysteriously shrinking waveform, and actually the open inductor explains why the proceedure for zero-beating the oscillator didn't work, since they have you ground the grid of the reactance tube through that same coil. Obviously, the result was dramatic: instant color lock!




Has a pretty obvious drive line now, I hadn't seen that before. Just another thing to add to the mental list of things to remember for later on. Right now I have a good chassis with color, and a tube with great emission just waiting for a nice cabinet to live in. I can't wait to drop it off, I just know Dennis will make it look like a million bucks!