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From: Winfield Hill <hill@rowland.harvard.edu>
Newsgroups: sci.electronics.design
Subject: Re: Amplifier transistor substitution.
Date: 18 Mar 2017 19:03:54 -0700
Organization: Rowland Institute
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Sylvia Else wrote...
>

 Sylvia, as mentioned, those are low-capacitance
 high-voltage video transistors.  All the rage
 when CRTs were in heavy use, but dropped like a
 rock thereafter.  Most were in TO-126 packages.
 You should replace both transistors, and maybe
 the associated bypass cap, in case it was the
 problem.  I've a good collection of TO-126 video.
 There's still a modest supply at various places.
 But if you don't easily obtain replacements,
 let me know and I'll mail you a few.


-- 
 Thanks,
    - Win