CT-100 B1001599 Failed Convergence Transformer

[dtvmcdonald]

Looking at that circuit I think that it could probably be made to work
with any audio transformer of the proper turns ratio and impedance by
coupling to the HV side with capacitors. Given the availability of
modern film caps of high capacitance it should work fine. You'd just need
some HV high value resistors and/or perhaps some Zener chains.

I use a Zener chain for the focus DC. The pot setting is quite stable. Thus, a 1 or 2 meg
pot and some fixed resistors or Zeners would surely work OK. The lower voltage across it would likely allow an available pot to work.

One of the common schematics has 27K for a plate resistor in the
convergence amp. Its supposed to be 270K, but 180K or 150K probably is better.

Doug McDonald