[Hallicrafters] HT-37 initial test

[Jim Marshall]

The 32 and 37 use a 5R4 HV rectifier and a 5V4 LV rectifier.
Jim, k6oly


________________________________
 From: Whitebear1122 <whitebear1122 at comcast.net>
To: bill kipping <ke7kk at earthlink.net> 
Cc: hallicrafters at mailman.qth.net 
Sent: Friday, March 22, 2013 1:20 PM
Subject: Re: [Hallicrafters] HT-37 initial test
 
While I don't own an HT32 or 37, I would suggest that you first replace the hv capacitors.  They are likely bad or going bad.  Your unobtainium transformer will love you for that :)  I don't know what rectifier tubes the 37  uses, but if they are 866's, you might want to pull them out and replace with 3B28's.  The 866's are pretty to look at but can arc over.  I had a flash over in my Valiant at one time and put in the Xenon 3B28's.  Not as pretty but no flash over either.  

Solid stating the old rig topic will generate a lot of controversy from both camps.  If I were contemplating it, I would leave the tubes in and build a buck transformer and knock your 122 vac down to 110 vac.  I had a 32V3 and V2 that I just didn't solid state.  

Have fun with your cool transmitter!!  73, Scott WA9WFA
On Mar 22, 2013, at 2:27 PM, bill kipping <ke7kk at earthlink.net> wrote:

> Hello to the group, I have an HT-37 I bought 8 years ago from a honest fellow at a hamfest , said it worked well. Time to try it out. The power supply is unmodified an the transformer looks origanial. I plan to remove/isolate the 5V windings and replace the rectifier tubes with Weber Copper tops before bringing up on a variac. Anything else?  Tnx Bill KE7KK
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