Just bought a (1970) pair of ESL-57s

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Forgive my ignorance, but how do I "visually check the rectifier stack for the HT supply"; what am I looking for?

Thanks anyhow for the reply, I should be able to handle the vacuum cleaner bit - just so long as my wife doesn't catch me.
 
You want to see if it's burned-looking. You'll probably want to replace it anyway, and the good news is that replacement HT supplies aren't too expensive.

Here's some nice pix, including the holes I was talking about:

Quad ESL-57 repair by Hey You

Source for repairs and replacement parts- I know this guy pretty well, his restorations are terrific. The site is worth poking around.

QUAD ESL 57 repair and refurbishment
 
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