[Hallicrafters] HT-33A Fan Assembly Needed

[Carl]

Correction: They used that right thru the LK-800A and it works fine at 2500W 
out even in contests. The muffin fan is a German EBM Papst and is mounted 
inside the sub chassis for the 3X  3CX800A7's. It blows thru Eimac chimneys 
and then silicon rubber to the top of the cover.

Carl
KM1H



----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Halliqth" <hallicrafters at mailman.qth.net>
Cc: <anchor at ec.rr.com>
Sent: Friday, April 16, 2010 5:00 PM
Subject: Re: [Hallicrafters] HT-33A Fan Assembly Needed


> Al,
>
> The folks that made the Amp Supply Amplifiers, used the muffin system
> with up to 3 3-500Zs.  I questioned their setup at first.
>
> They used a plate to hold the tubes above the bottom of the cabinet on
> the right side.  This allowed them to blow the air across the pins and
> the tube bottom, also letting the "majority" of the flow go over the
> envelope and plate cap.
>
> They found a system that worked.  Most of us would NOT go that route.
> We, (Most of us antiques.), would have gone for Eimac sockets and 
> chimneys!
>
> Mine has P.W. Dahl transformer, healthy electrolytics, and toroidal
> tuned inputs.
>
> She'll hold that 300W resting carrier and modulation that comes from a
> DX-60 25W carrier through "old buzzard" turns at the mic!
>
> I can't complain.
>
> Going back to re-organizing house after a carpet cleaning yesterday!
>
> Bob - N0DGN
>
> On 4/16/2010 4:49 PM, Al Parker wrote:
>> hi Bob,
>>     OK.  I have an HB amp with pr of 4-400's, have a good sized muffin
>> below the chassis to pressurize there & blow air up thru holes around
>> the tubes (no chimneys).  Then a small muffin above them, exhausting
>> air.  Seems to have been OK for yrs, but no long transmissions, no AM,
>> etc.  It lives in the "upstairs shack", the Henry in teh "shop shack".
>>     The Henry 3K-A uses a pr of 3-500z's, with chimneys and pretty
>> strong airflow up thru, from husky fan below.  Much better.
>> 73,
>> Al
>
> ______________________________________________________________
> Hallicrafters mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hallicrafters at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html