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

[Gary Schafer]

 Bird uses oil in their dummy loads for cooling.

73
Gary K4FMX

> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Steve
> Wright
> Sent: Tuesday, March 17, 2015 1:59 PM
> To: amps at contesting.com
> Subject: Re: [Amps] GS-35b fully-submersed oil cooling
> 
> 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
> 
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