[Hallicrafters] SX-25 sn/H-104930

[Jim Marshall]

Wow! I had never heard of this... I say "any day nothing is learned is a wasted day"! So I have learned my tidbit of information for the day. I can see how this can work, and thank you for sharing.
J. Marshall, k6oly


________________________________
 From: Glen Zook <gzook at yahoo.com>
To: DJ <fourzulufive at yahoo.com>; "Hallicrafters at mailman.qth.net" <Hallicrafters at mailman.qth.net> 
Sent: Saturday, November 24, 2012 11:34 AM
Subject: Re: [Hallicrafters] SX-25 sn/H-104930
 
As for "C":  The two wires "wrapped" form what is called a "gimmick" capacitor which has a very low actual capacitance.  This type of capacitor was very common for coupling the BFO in receivers.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
From: DJ <fourzulufive at yahoo.com>
To: "Hallicrafters at mailman.qth.net" <Hallicrafters at mailman.qth.net> 
Sent: Saturday, November 24, 2012 12:43 PM
Subject: [Hallicrafters] SX-25 sn/H-104930

Hi all,


So after almost 5 years after acquiring an SX-25 and promptly putting it on a shelf to wait for that rainy day yesterday became that rainy day. I decided to start the overhaul with a full recapping of which I finished most of today.

Having "restored" an SX-16, S-22, SX-42, SX-62 and a few others I feel pretty confident I can handle this one too, but having said that all it really means is that I can follow direction and know a little bit about radios...

So my questions to any of you that have gone down the SX-25 road are now that it's on the "bench" are:

A. What are the standard improvements if any?
B. Is there any good reason why there is a 6AC7 AND several 6SG7 tubes being used instead of the 6SK7s?
C. There are two wrapped wires twisted together, but not joined between the set of pads for the OSCILLATOR and for the 2nd IF.  Is this normal?

There are a few other things, but I'll start with these.
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