[Hallicrafters] SX-25 Troubleshooting Help Needed

[Asif Khan'Nick']

Joe
You need to replace ALL the paper caps otherwise you'll end up LOSING the power transformer,filter choke and the audio output ! Check for all out of tolerance and open resistors.Check all the tubes .Otherwise you're not going anywhere !

Regards,
Nick






-----Original Message-----
From: Joe Connor <joeconnor53 at yahoo.com>
To: hallicrafters at mailman.qth.net <hallicrafters at mailman.qth.net>; boatanchors <boatanchors at mailman.qth.net>
Sent: Fri, Jun 24, 2011 5:43 pm
Subject: [Hallicrafters] SX-25 Troubleshooting Help Needed


I picked up a beat-up SX-25 today and need some help.

fter changing the 'lytics, the broadcast band (Band 1) plays beautifully. The 
et, however, is completely dead on all other bands. There isn't even static. 
here is no sound when I disconnect or conntect the antenna. Jiggling the 
andswitch does not help. I have plate and screen voltages on both the 1st and 
nd RF tubes (6SK7s). 

 did signal injection. On Band 2, I got an RF signal from a signal generator 
hrough the 2nd RF with some amplification. (Thanks God for tube extenders!). I 
ot an RF signal through the 1st RF with no amplification. Even the 
mplification I got on the 2nd RF was far less I got on Band 1 (BCB). On Band 3, 
 couldn't get any signal through either RF stage. 

he set is pretty original. There are signs of a few caps being replaced in the 
40s or '50s. The only modern cap is one orange drop used as a bypass cap. I'd 
ike to troubleshooting this systematically, rather than simply blindly replace 
aps and hope I hit the problem.

ny ideas or troubleshooting tips?

s always, thank you for your help.


                          Joe Connor
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