That’s because it’s a spline. Not hex, not torx.
Spline AKA Bristol.
Just one source:
http://www.americanradiosupply.com/ss-508-bristol-spline-key-wrench-9-piece-set/
Collins always used them on knobs and set screws.
Thanks
73
Jim W7RY
-----Original Message-----
From: Mark Beckwith
Sent: Friday, March 02, 2018 7:30 PM
To: amps@contesting.com
Subject: [Amps] Plate hardware for Eimac tubes
Hi - having some difficulty here swapping tubes around. Is there a standard
tool/hardware size for the plate caps and heat sinks on top of the Eimac
tubes (I'm working with 3-500s and 4-400s this evening trying to get an amp
working). It seems like it must be a Torx T5. Is that right? Is it
standard? Hex keys don't seem to work, and the set screw heads are so small
I really can't see them well enough to get after it without risking damaging
tool or part. (Also I don't have a Torx T5 and it just seems like that must
be it but I don't have one to try).
Help? Thanks.
73 - Mark N5OT
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