I remember a conversation with Ian GM3SEK about heatsinks when I was
building my GI7b & GS31 2m amplifiers (apologies if I misquote you Ian,
you'll probably pop up and say something). I also suggested heat sink
compound but Ian pointed out that the tube-heatsink interface
temperature was too high.
He did suggest that the machining on the tube anode & heatsink were not
great and that it might be a good idea to stick them in a lathe and skim
them to improve heat transfer. I didn't actually do this but it seems a
good idea to me.
I don't have a GS35 in the shack at the moment. I did post one out to a
friend a couple of years ago and seperated the tube & heatsink because
two packages made the postage cost lower. I don't remember there being
any difference in the fitting but I wish I could be sure. But I know a
man who will know for sure and I'll ask.
73 Paul G4DCV
On 20/05/2011 08:17, DAVE WHITE wrote:
> 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
>
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