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Old 8th Dec 2021, 11:37 pm   #6
murphyv310
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Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
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Default Re: CRT Heater to cathode leakage

Hi.
On a older black and white set with a valve video amp often adding an isolating transformer will degrade the HF response somewhat. The idea if physically possible is to add a cathode follower after the video amp, the low output impedance restores the HF content.
Although a few turns round the lopt core can drive the heaters on older sets you can get a little shading on screen. I doubt a TV22 or Pye V4 would have enough puff to drive a CRT heater without complaining a little bit, I could be wrong though.
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