[Hallicrafters] HT-33A Fan Assembly Needed

[Carl]

What Im trying to get thru to you is that Amp Supply used the muffin fan on 
the full series of models, not the way it was mounted.

Keep your LK-500ZB photo, Ive had a ZC model since new in 86 and do a lot of 
Amp Supply repairs, moreso since my good friend Bill Edwards, K4BWC, of 
Omega Electronics, died 2 years ago.

Carl
KM1H



----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Halliqth" <hallicrafters at mailman.qth.net>
Cc: "Carl" <km1h at jeremy.mv.com>
Sent: Friday, April 16, 2010 5:13 PM
Subject: Re: [Hallicrafters] HT-33A Fan Assembly Needed


> 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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> |               AM Amateur Radio Operator    NØDGN                 |
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> | Bob Bethman                \\\|///     " The absence of a danger |
> |                           \\ ~ ~ //      signal does *NOT* mean  |
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