[Hallicrafters] HALLICRAFTERS S-77

[John via Hallicrafters]

Hi Scott
 
You should really think about using an isolation transformer with this  
AC/DC set.  Sometimes, reversing the line cord will negate the hum problem.  Be 
sure to replace all caps, especially electrolytics in the audio section. I  
assume you have already changed the filter cap and have the new one(s) 
wired in  correctly.
Check for cold solder joints and good ground connections especially in the  
audio stages.
 
73 and let us know what you find.
 
John,  W4AWM
 
 
 
 
 
 
In a message dated 8/4/2014 2:49:00 P.M. Eastern Daylight Time,  
scott.cronin at feldmangetz.com writes:


GOOD  MORNING GROUP HAVE A TECHNICAL QUESTION
I HAVE CHANGED OUT THE CAPS AND IT  HAS MADE A VAST IMPROVEMENT
THERE IS ONE ISSUE THAT SEEMS TO REMAIN
WITH  THE VOLUMN CONTROL TURNED DOWN THERE IS A LOW VOLUMN HUM COMING
FROM THE  BUILT IN SPEAKER
ANY IDEA'S?

AND THERE WERE 2 CAPS WRONG IN THE  HAYSEED KIT
THERE IS A ,05 MF MISSING AS WELL  AND THEY GAVE ME  A  .0047 MF
AND THE CORRECT VALUE SHOULD HAVE BEEN .047

A  SIMPLE CORRECTION

MORE INTERESTED IN THE HUM

THANKS SCOTT  W4SO