[Hallicrafters] HT-32 and HT-37 Transformers

[Glen Zook]

The widespread number of transformer failures on both the HT-32- series and the HT-37 suggests that the transformer is either being run on the "ragged edge" or is suffering from design faults, maybe both.  Production tolerances may play some role in just how long a particular transformer survives.

The transformer in the Heath DX-35 is notorious for being operated well outside of the capabilities of the transformer and that in the Heath DX-40 is only slightly better.  Transformer failures in those units are VERY well known.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: David C. Hallam <dhallam at knology.net>
To: rbethman <rbethman at comcast.net> 
Cc: 'hallicrafters' <Hallicrafters at mailman.qth.net> 
Sent: Tuesday, October 2, 2012 3:31 PM
Subject: Re: [Hallicrafters] HT-32 and HT-37 Transformers
 
I have owned 3 HT-32's; HT-32, HT-32A, and HT-32B.  The HT-32 and HT-32B 
both had transformer failures.  In both cases, the transformer was 
rewound by Jess Price in Orlando, FL.  I only owned the HT-32 for about 
3 years after the transformer was rewound so I really can't comment on 
it's longevity but the HT-32B has been going strong since 1977.

David
KW4DH


On 10/2/2012 3:05 PM, rbethman wrote:
> There has been a lot of discussion of this one particular transformer.
>
> First: Were all made by the same manufacturer?
>
> Second: Which of those used by Hallicrafters are the ones with the issue?
>
> Third:  How many of each transmitter were produced?
>
> I ask this to get a far better picture of the failure rate!
>
> I propose that these were made by different manufacturers, and NOT by
> Hallicrafters.
>
> Many Hallicrafters produced transformers have the Halli Logo stamped in
> their end bells.
>
> In the instance of SX-99s, I have seen black end bells and I have seen
> chrome plated end bells.
>
> It makes no sense whatsoever to chrome plate end bells due to extra cost
> - UNLESS - they were obtained from a vendor that got a contract with a
> lower price per unit.
>
> What say y'all?
>
> Bob - N0DGN
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