[Hallicrafters] HT-37B Tube mystery

[Darryl Jones]

Thank you, 5V4 it is :)

I always run my tube gear through variacs about 105v......force of habit 
after smoking a Gonset transformer where the line voltage was in excess of 
120v. Actually, thats what made me check the wall outlet and run through 
variacs.

Darryl
----- 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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