The newer Asian knock-offs seem to
use Allen screws.
The old EIMAC HR series used a
6-32 screw. I have a few of the older
EIMAC ones I found in my stash.
Nice round edges, not the sharp ones
we see today.
73, Dick, W1KSZ
On Mon, Mar 5, 2018 at 8:35 AM, David Gow <6146guy@gmail.com> wrote:
> My Henry 3KA had Bristol screws in the pate connectors and all knobs.
>
> On Sun, Mar 4, 2018 at 2:28 PM, Jim W7RY <jimw7ry@gmail.com> wrote:
>
> > Should read just one of many sources.
> >
> >
> >
> >
> >
> > Thanks
> > 73
> > Jim W7RY
> >
> >
> >
> > -----Original Message----- From: Jim W7RY
> > Sent: Sunday, March 04, 2018 1:15 PM
> > To: Mark Beckwith ; amps@contesting.com
> > Subject: Re: [Amps] Plate hardware for Eimac tubes
> >
> >
> > 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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> >
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> >
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