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.
>
> *******************************
>
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guys!
>
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>
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