[Hallicrafters] HT-37B Tube mystery

[jeremy-ca]

Amen to the transformer. Hallicrafters from the late 30's and into the 60's 
are poorly designed even though they claim 125V operation.  Tests Ive run 
show them starting to go into saturation at 124-125V.

A properly rated 10-12V filament xfmr run in a bucking  configuration drops 
the input well down into the safe zone.

Carl
KM1H



----- Original Message ----- 
From: "Jack Schrader" <w1jhs at verizon.net>
To: "Darryl Jones" <1986944 at comcast.net>; <hallicrafters at mailman.qth.net>
Sent: Sunday, April 13, 2008 7:42 PM
Subject: Re: [Hallicrafters] HT-37B Tube mystery


> According to my 32b the three tubes across the back of the chassis are :
> oa2, 5v4 and 5r4 next to the power transformer.
>
>>From my experience and others, replace the two rectifying tubes(5v4 &
> 5r4) with solid state devices before you burn out the transformer like I
> did. The tranny does not like the combination of a higher line voltage
> and the increase temp developed in the transformer. This same advice
> goes for the ht37.
>
> ----- Original Message ----- 
> From: "Darryl Jones" <1986944 at comcast.net>
> To: <hallicrafters at mailman.qth.net>
> Sent: Sunday, April 13, 2008 7:30 PM
> Subject: [Hallicrafters] HT-37B Tube mystery
>
>
> Hello All,
>
> I recently picked up an HT-32B and am having problems identifying a
> missing tube. I pulled all the other tubes, and replaced any that my
> Hickock didn't like, but have yet to figure out what the missing tube is
> that wasn't on the chasis. It's located directly behind the tuning
> capacitor on that board, and doesn't have a chasis marking for it.
>
> Anyone have an ID for me?
>
> Thanks for your help,
> Darryl
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