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Old 26th Aug 2017, 10:35 pm   #38
beery
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Join Date: Jun 2006
Location: Ware, Hertfordshire, UK.
Posts: 988
Default Re: And the next one! a GEC BT2147

Hi Matt,
R73 frying is a sign that the frame output valve is overdriven with DC.
This could be due to resistive leakage through C55 or C57, the height control pot wiper not making contact or R71 being open circuit. Less likely is that the frame output valve has an internal short. Another posibilty is a short causing a low resistance in the primary of the frame output transformer, but this is also unlikely.

Cheers
Andy
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