[Hallicrafters] HT-32 to HT-37

[K4PRF, B. L. Pratt]

Lesson learned the hard way.  If you have one of these fine transmitters 
and if it is still using the 5V4 low voltage rectifier, your power 
transformer is in danger.  If I remember correctly the problem is caused 
by a cathode to plate short in the 5V4 which opens the high voltage 
winding in the PT.  These transformers are very hard to find and 
expensive if you can find one.  I purchased a beautiful HT-32A several 
years back knowing that the PT was bad.  I was able to order a 
replacement PT from the Peter Dahl Co.  Expensive but a perfect 
replacement and runs very cool.  I replaced that 5V4 with a 5R4 in this 
and my HT-37.  I am told that those 5V4s have killed many a transformer 
and some call it a "death tube."  You might while you are in there 
replace the selenium bias rectifier with a silicon rectifier.  There 
have been many articles dealing with these modifications on the HT-32s 
and HT-37s. 

Burt  K4PRF