[Hallicrafters] HT-37 Rebuild

[JM/CO]

It does sound as though you have  found a low mileage HT-37. Be warned that
the power transformers in these are fragile. They were designed a bit
"under-size" for the application.
It is generally a good idea to replace ALL the capacitors, except the
ceramic types before you fire the set up. Do not think that, just because
there is little use evident, that your capacitors are not leaky / shorted.
Time, alone, is all that is required for these to go leaky or shorted. Many
who restore HT-37s, and certain "other" Halli sets, convert the low(er)
voltage power supplies to solid state, mainly in order to reduce the total
overall current pulled by the primary of the power transformer. These
transformers are always hard to find and expensive to have rebuilt.
Prevention is the thing here, so change out those nasty ol' caps.
And--No, I don't think Halli ever branded their 6146s, but you had better
solicit other opinions. The finals are often the first tubes to get replaced
as a rig piles up the hours, so they very well may have been changed.
Chuck N1LNH
----- Original Message ----- 
From: "Bill Gerhold" <wpgerhold at elongo.com>
To: "Hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Wednesday, October 15, 2003 10:49 AM
Subject: [Hallicrafters] HT-37 Rebuild


> I have thoroughly cleaned the chassis of my HT-37.  Did it by using a
> small solder paste brush
> And a small vacuum attachment.  The chassis cleaned up nice and shiny.
> No rust spots, no
> Grease.  All the tubes (except finals) are stamped Hallicrafters, the
> panel lights are 2 # 44's and
> 1 # 47.  All 3 bulbs appear to be new, no internal blackening.  The
> bulbs had the same amount
> of dirt on them that the chassis did.  The rubber feet are original and
> show no signs of wear at all!
>
> I am in the process of changing all electrolytic caps.  Once completed I
> will bring it up slowly,
> Monitorinig key voltage points.  This should happen in about 2 weeks.
>
> All the above indications lead me to believe that I have acquired a rig
> with very little or no use at all.  Is
> This possible?  Did Hallicrafters ever put their name on 6146's.
>
> K2WH
>
>
>
>
>
>
>
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