You find out what they fixed in your V's filter apparent losses ?
----- Original Message -----
From: "Dave Edwards" <kd2e@comcast.net>
To: <tentec@contesting.com>
Sent: Tuesday, January 20, 2004 13:04
Subject: Re: [TenTec] Quieting fan
> Yikes!!! A poison tube???
> Spewing out toxic RF??
> Actually, it was the heat sink conduit...a Beryllium block that is toxic
if
> shaved, sanded, or otherwise "messed" with.
> The HA14 (Compact Kilowatt) is an SB200 with an external power supply. It
is
> small!!
> Also quiet because of no fan. The difference between the HA14 and the
SB230
> is that the 230
> had a quiet system of cooling. The HA14 had no cooling. It gets pretty
hot,
> and should have a 8 or 9 watt fan on top of it. The HA14's filaments are
in
> series vs parallel for the SB200.
> Both amps work great. I wish the idea behind the SB230 could have been
> pursued. I don't think it is impossible to have silent operating amps.
> ...Dave
> ----- Original Message -----
> From: "Rick Westerman" <Rick@dj0ip.de>
> To: <tentec@contesting.com>
> Sent: Tuesday, January 20, 2004 12:46 AM
> Subject: RE: [TenTec] Quieting fan
>
>
> > It was the 70's and the mobile amp was (as I recall) the HA-14
> > using 2x 572B's.
> >
> > The problem with the SB230, apart from the tube being highly
> > poisenous, is simply the cost of a new tube and the extreme
> > difficulty of locating one anyway. Otherewise it was a good amp.
> >
> > 73
> > Rick
> >
> > -----Original Message-----
> > From: tentec-bounces@contesting.com
> > [mailto:tentec-bounces@contesting.com]On Behalf Of Ron Notarius
> > WN3VAW
> > Sent: Tuesday, January 20, 2004 5:28 AM
> > To: tentec@contesting.com
> > Subject: Re: [TenTec] Quieting fan
> >
> >
> > Wasnt the SB-230 the allegedly mobile linear, or am I thinking of
> > a
> > different one? Also, I seem to recall it from the era of the
> > late 60's
> > and/or '70's, not the '80's.
> >
> > 73, ron wn3vaw
> >
> > "I'd give real money if he'd just shut up!"
> > Dr. Leonard McCoy, "Start Trek VI: The Hills Are Alive with the
> > Sounds of
> > Klingons"
> >
> > ----- Original Message -----
> > From: "Dave Edwards" <kd2e@comcast.net>
> > To: <tentec@contesting.com>
> > Sent: Monday, January 19, 2004 11:01 PM
> > Subject: Re: [TenTec] Quieting fan
> >
> >
> > Steve... My 1KW Heathkit SB230 from ...I guess the early '80s
> > uses a heat
> > sink cooled tube.
> > A single 8873, it uses no fan...just a heat sink on the back and
> > does an
> > easy 600 watts out.
> > Totally quiet!!
> > ...Dave
> > ----- Original Message -----
> > From: "Steve Weber" <kd9bo@mac.com>
> > To: <tentec@contesting.com>
> > Sent: Monday, January 19, 2004 8:17 PM
> > Subject: Re: [TenTec] Quieting fan
> >
> >
> > > Dear fellow cult-of-the-cosmic-orange-dot members,
> > >
> > > Would it be possible to surround the tube with a finned heat
> > sink
> > > similar to those used on some transistors? What about ducting
> > that
> > > discharges by the tubes or even surrounds the tubes? Having
> > never
> > > seen the inside of this amp, I may be simply blowing hot air.
> > (ouch)
> > >
> > > KD9BO Steve
> > >
> > > >Hi Gary,
> > > >
> > > >The original post was in regards to an amplifier which uses a
> > pair
> > > >(maybe 4) 572B triodes. These are glass envelope tubes. While
> > it may
> > > >be possible to precool the air using a chilled water system,
> > there
> > > >would still be a need for a fan to blow the air across the
> > tube
> > > >envelopes. Perhaps the air flow rate could be reduced and the
> > fan
> > > >could be quieter using cooler air.
> > > >
> > > >There are water cooled tubes and conduction cooled tubes,
> > which
> > > >could reasonably incorporate a liquid heat transfer media. In
> > the
> > > >case of glass envelope tubes I really see no reasonable way
> > that
> > > >water cooling could be applied.
> > > >
> > > >DE N6KB
> > > >
> > > >
> > > >
> > > >
> > > >_______________________________________________
> > > >TenTec mailing list
> > > >TenTec@contesting.com
> > > >http://lists.contesting.com/mailman/listinfo/tentec
> > >
> > >
> > > --
> > > Steve Weber
> > >
> > >
> > > No trees were killed in the sending of this message. However
> > > a large number of electrons were terribly inconvenienced.
> > >
> > > *******************************
> > >
> > > Hey spammers - Harvesting email addresses? Don't overlook these
> > guys!
> > >
> > > FCC Chairman Michael K. Powell: mpowell@fcc.gov
> > > FCC Commissioner Kathleen Q. Abernathy: kabernat@fcc.gov
> > > FCC Commissioner Michael J. Copps: mcopps@fcc.gov
> > > FCC Commissioner Kevin J. Martin: kjmweb@fcc.gov
> > > FCC Commissioner Jonathan S. Adelstein: jadelste@fcc.gov
> > >
> > > US Postal Service: customer@email.usps.gov
> > > Fraud Watch: fraudinfo@psinet.com
> > > Federal Trade Commission: consumerline@ftc.gov
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> >
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