[Hallicrafters] SR-150 problem

[Laurance Brungardt]

Hi Burt,
 
I've owned two SR-150's and the only things along those lines that I've had to deal with are:
 
Rig keys but no power out.
 
1. No high voltage to the plate circuit of the finals, caused by a plate short in one of the finals which takes out the safety resistor  R207 in the power supply (10ohm 1watt).
 
2. Relay K1 dirty, +95 volt bias switching not dropping to gnd. (easily spray cleaned with contact cleaner)
 
73's
Red - W5UW


Burt Pratt K4PRF <pratt at zebra.net> wrote:
I have a problem with my old SR-150 that I just cannot seem to solve. I 
am sure that I am just overlooking the obvious. The problem is no power 
out in CW or SSB on any band unless I unbalance the carrier. I have 
done all the resistance and voltage checks of all of the tube pins and 
they are for the most part right on. I have tried the rig with two 
other PS-150 power supplies. All of the tubes have been checked or 
replaced. The receiver is as hot as it can be. I did a complete 
alignment by the book and found everything very close to specks. All of 
the switches and relay contacts have been cleaned and checked. 

I have owned this transceiver since it was new and have worked the world 
with it. Do any of you SR-150 owners have an idea that I can try?

Burt Pratt K4PRF


pratt at zebra.net

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