[Hallicrafters] SX-25 Troubleshooting Help Needed

[Carl]

Agree, its like sitting still and spinning the wheels on dry pavement, 
eventually something blows.

That set has some paper caps buried under the bandswitch that are a semi 
PITA to get at

Carl


----- Original Message ----- 
From: "Asif Khan'Nick'" <hallicraftersx28 at aol.com>
To: <Hallicrafters at mailman.qth.net>
Sent: Friday, June 24, 2011 8:57 PM
Subject: [Hallicrafters] SX-25 Troubleshooting Help Needed


>
> 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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