Thread: Stromberg Carlson X-21 M4B project.
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Old 08-23-2020, 10:15 PM
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Yamamaya42 Yamamaya42 is offline
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OK... this is a bit confusing
the 21aup4a has an aluminized screen and an ion trap?

I thought ones with aluminized screens did not need traps.

or is this just an odd tube?
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