I already replaced the transformer but its easy to get to so I will get some correct compound and re-install it. The original does not seem to have any filler in it, its clear. Same stuff on the oscillator.
I misplaced a nut. Plain 6-32 nut. Stopped because when I start losing things or droppings things its a sign of fatigue. Very frustrating.
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On 5/3/2018 3:43 PM, George Kerber wrote:
Richard,
I just finished restoring a Tek 647A using a HV transformer from a 453. The
transformers are nearly identical except to pin-out arrangement. Both
transformers require heat sinking to the chassis using suitable thermal
grease. I prefer non-silicon compound such as Wakefield 126 series or one
of the popular PC processor thermal compounds that have better spec's. The
thermal compound on the ferrite core is there to remove heat, not for any
electrical purpose. I avoid silicon-based thermal compounds, because they
tend to creep and may eventually lead to electrical issues.
George
--
Richard Knoppow
dickburk@...
WB6KBL
