Fw: [AMPS] Thar she blows

[Steven Moore]

----- Original Message -----
From: "Steven Moore" <wd0ct@networksplus.net>
To: "Barry Kirkwood" <bjk@ihug.co.nz>
Sent: Monday, May 14, 2001 5:04 PM
Subject: Re: [AMPS] Thar she blows


> Hi everybody,
>
> I presume someone has done the smoke flow test on cross flow cooled tubes.
> Maybe even the Heath engineers? Does this test show the smoke flow [ and
> thus the airflow] to truly envelope both sides of the tubes?
>
> 73, Steve   wd0ct
>
> ----- Original Message -----
> From: "Barry Kirkwood" <bjk@ihug.co.nz>
> To: <amps@contesting.com>
> Sent: Monday, May 14, 2001 4:27 PM
> Subject: [AMPS] Thar she blows
>
>
> >
> > Years ago I had an SB220 and I was impressed with the quiet fan, pushing
> air
> > transversly around the 3-500s.
> > But I did have one filament pin unsolder, possibly a manufacturing
defect
> > but likely to be due to excess heat.
> > I gather SB220 have a reputation for good tube life, altho the available
> > voltage means tubes are slightly under run.
> > Seems to me that somone with a modest knowledge of the physics involved
> > would be able to calculate the transverse airflow required to keep a
> 4-1000
> > happy.
> > I also suspect the a couple of copper fins added to the filament sockets
> > might keep them happy with transverse flow.
> > The standard plate connectors typically have transverse fins, so all in
> all
> > the big fan seems quite a good way to go, if the numbers look good.
> > Anybody out there able to do the calculation?
> > 73
> > Baz
> >
> > end
> > Barry Kirkwood PhD ZL1DD
> > Signal Hill Homestay
> > 66 Cory Road
> > Palm Beach
> > Waiheke Island 1240
> > NEW ZEALAND
> > www.waiheke.co.nz/signal.htm
> >
> >
> >
> > --
> > FAQ on WWW:               http://www.contesting.com/FAQ/amps
> > Submissions:              amps@contesting.com
> > Administrative requests:  amps-REQUEST@contesting.com
> > Problems:                 owner-amps@contesting.com
> >
>


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