Quote:
Originally Posted by Electronic M
Nobody has had any luck with fixing the original HV osc transformers in 7" halicrafters. Easiest thing is to find a Motorola TS-4 or TS-18 chassis set (the most common electrostatic TV) with a dead CRT or cabinet beyond restoration and steal the HV transformer from it. Copy the Motorola HV osc circuit but use a 8BQ5 instead of a 25L6. Replace the 6C4 heater with a resistor. The Hallicrafters has a split heater string that converges at the 6X5s hot heater pin (it's other heater pin goes to ground). Ungrounf the 6X5s grounded heater pin and insert the 8BQ5 heater between that and ground. I did this modification on my Hallicrafters and it's been solid ever since.
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Thanks Tom. I’ll have to get that set out of storage and give it some CPR. I thought it was a not working for parts sale on eBay but someone before the flipper who sold it to me restored everything. All caps, all resistors…absolutely everything so I haven’t done too much to it except put it on a shelf