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[email protected] tubeguy@myshop.com is offline
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Default Mystery part on schematic

This website discusses it, but never really identifies the part. This is
the meter I am working on and I too wondered what the SA1 and SA2 parts
are. I never saw that symbol.

https://www.antiqueradios.com/forums...c.php?t=117824

Schematic on the webpage.