[Boatanchors] HT-32

[David Harmon]

In the late 60's I found a like new HT-32B and I remember having some confusion regarding the meter adjustment.
In my opinion....from memory all these years later....the manual was confusing to me.
Anyway....I finally got it working correctly....with some effort.
I wish I still had it!!
Back then....I did not know about the transformer failures so I left the rig unmodified......these days....definitely do what Robert says.
I have used the CL-60 inrush limiter (and others) in several Johnson 500 transmitter rebuilds and the limiters work great.

73

David Harmon
K6XYZ
Sperry, OK


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Robert Nickels
Sent: Friday, May 24, 2019 9:43 AM
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] HT-32

On 5/24/2019 12:26 AM, RAY FRIESS wrote:
> I'm feeling a bit intimidated by my recently acquired HT32.

Ray, let me offer a suggestion that might avoid some real heartache.  
Follow the advice of my friend W8UT and solid-state the power supply 
right away.   Here are some details: http://www.boatanchors.org/HT37.htm

All the comments about HT-37 applies to the HT-32 as well.   The power 
transformer in these transmitters have a long history of failure, and 
converting to solid state rectifiers will allow you to disconnect the 5V 
rectifier filament windings completely (clip them at the socket) which 
will eliminate one of the common failure points - shorts from HV to 
filament windings.

I also suggest adding an inrush current limiter which will provide a 
"soft start" and further reduce stress on the transformer.   The 
Thermometrics line is now owned by Amphenol Advanced Sensors, and I 
can't be sure but I probably used the CL-60 which has a cold resistance 
of 10 ohms and can handle a steady-state current of 5 amps.  Mount it in 
open air as it will run warm to hot but it's designed to do so.

And of course replacing the filter caps with new ones will reduce the 
charging current that the transformer must supply.   Doing these things 
to protect the power transformer will give peace of mind - having lost 
two transformers this way,  I love *not* hearing that "thunk" when I 
turn on the power!

73, Bob W9RAN

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