[Hallicrafters] HT-33A Fan Assembly Needed

[rbethman]

Carl,

The LK-800A "may" indeed be that way.

However, the LK-500ZB is precisely as I have described.

Would you care for some pictures being posted?  I also have the manual here.

It WILL depend upon WHICH model of theirs!

Bob - N0DGN

On 4/16/2010 5:09 PM, Carl wrote:
> 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
>>
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>

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