I don't think the hole is tapered. I've seen loads of these things around
at Eurpoean fleamarkets over the years, but never took that much notice of
the tube geometry so I could be wrong. I'm pretty sure it's just an
interference fit with the threaded nut to hold it in. However that's a bit
counter-intuitive to my thinking: wouldn't a taper be better from a heat
transfer point of view since it's more likely to get a good surface contact
all the way down? However these things were built to a price in the old
Soviet Union where design simplicity* (and tooling simplicity*) was a big
criterion so if it's not tapered I'd be tempted to put a load of heat sink
splodge between tube and heatsink (unless it's already there)?
* I like simplicity. Simplicity is *GOOD* and comes right after Godliness
and cleanliness in my book :-)
cheers
Dave G0OIL
----- Original Message -----
From: "Glen Zook" <gzook@yahoo.com>
To: <amps@contesting.com>
Sent: Friday, May 20, 2011 4:21 AM
Subject: [Amps] GS-35b heat sink
> There are various statements on various Internet sites about the GS-31b
> using the GS-35b heat sink. Some say that the heat sink works fine.
> Other sites say that the GS-31b heat sink works on the GS-35b but not the
> other way around. Still other sites say that the heat sinks are not
> interchangeable.
>
> I have found a site which sells the GS-35b heat sink separately from the
> tube.
>
> http://www.gstube.com/catalog/?key=+Gi-3+rc-35b
>
> They also have a photo of the heat sink and attachment hardware.
>
> http://www.gstube.com/photo/4480.jpg
>
> In the photo the hole in the heat sink doesn't appear to be tapered.
> However, from the angle of the photo it really is hard to tell.
>
> If the shipping charges are not too much, I am going to order 1, maybe 2,
> GS-35b heat sinks and see if they will work on the GS-31b as is. If not,
> then can they be modified (i.e. drilling out the heat sink) to fit the
> GS-31b? The basic cost of the heat sink, $12.90, is cheap enough and if
> the shipping charges are not that bad then I think it is worth the gamble.
>
> Then there may also be a chance that there are actually 2 different styles
> of heat sinks and 1 may fit the GS-31b fine and the other not yet both fit
> the GS-35b. Inquiring minds want to know!
>
> Glen, K9STH
>
> Website: http://k9sth.com
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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