[Amps] GS-35b fully-submersed oil cooling

[Steve Wright]

On 18/03/15 05:00, Mike Waters <mikewate at gmail.com> 
amps-request at contesting.com wrote:

Many thanks for your engagement.


> mechanical, non-RF side [...] another time.
Thank you.  We'll get to that after we establish it is a viable 
proposition RF-wise.


>
> Basically, I think oil cooling of some sort would work.

Thank you, so do I, but quote sources or include logic please.  I have 
my own opinions also which I seek to convert to facts - as much as they 
will stand up to scrutiny.


>   Low anode temp
> would not be an issue for this tube,
Quote sources..


>
> What is "dry" transformer oil?

Transformer Oil with traces of water removed with a desiccant 
refrigerant filter/drier - a mechanical issue.  For the purposes of RF 
analysis we may call it "dry", ie no moisture in it, and that the oil 
intrinsically is the dielectric, not some moisture-in-oil mixture that 
would be a risky proposition in your auto engine, let alone in a 4KV RF 
closed container.


> What is the dielectric constant of that oil?

I do not know.  I will ask the supplier and report back.  A quick google 
suggests ball-park relative permittivity of 2.0 to 2.5

This is a good question.  A rhetorical question might be, What might the 
effect be of raising the atmosphere around the tube relative 
permittivity, from 1.0 to near 3.0 εr, and how might tube parameters be 
effected?

There is likely a good reason this has not been attempted.

>
> What do you mean by "close-housing..."?

I mean, to build some welded aluminium box/socket arrangement with O 
ring seals and a lid (maybe polycarbonate) on it etc, and that the walls 
of the box are quite close to the tube at many points - maybe only as 
much 1cm apart.  A mechanical issue for sure, but the boxes' effect on 
the tube may be marked, or even dramatic, or even fatal - electrically 
and RF-wise, so the box is relevant, electrically.


Many thanks again for the engagement.

Steve
ZL1BHD