[Hallicrafters] Hallicrafters SX-88

Tue Jul 21 05:27:16 EDT 2015

Jim,

There is a good recent report of a comprehensive Hallicrafters SX-88 restoration with follow-up performance test results by Jay Rusgrove; W1VD at:
http://www.w1vd.com/HallicraftersSX-88.html

Jay did measure the SX-88 50KC IF transformer "Q" and it's actually better than we anticipated at 230. The transformers Hallicrafters employed in other models using a 50KC 2nd IF system are not quite like these. Jay also swept the 50KC IF's after a complete electrical restoration and reports the curves do match the original engineering design. 

Regards, Greg Gore
WA1KBQ

-----Original Message-----
From: Jim Liles <hallicrafterssr2000 at k9axn.com>
To: hallicrafters <hallicrafters at mailman.qth.net>; Roy Morgan <k1lky68 at gmail.com>
Sent: Sun, Jul 19, 2015 7:50 pm
Subject: Re: [Hallicrafters] Hallicrafters SX-88

I would like to repeat an information request regarding the 50Kc I.F. system
used in the SX-88.  

-----Original Message----- 
From: Jim Liles 
Sent:
Thursday, July 16, 2015 7:21 PM 
To: hallicrafters at mailman.qth.net ; Roy Morgan

Subject: [Hallicrafters] Hallicrafters SX-88 

I have some questions regarding
the SX-88.  

First have you done a sweep analysis of the 50Kc I.F. system or do
you know of someone who has?  At this point it appears that nobody has taken the
time to sweep that system ---- anybody? 

Can anyone confirm that the 50Kc I.F.
charts in the book are correct?

Looking at the design I would expect the shape
factor for the system to be close to 2.2/1 which is very close to the crystal
filters of that time.  Is that a correct analysis?

Has anyone measured the Q of
the first, second , and fourth 50Kc transformer pairs as well as the third
pair?

More questions but sure would like to hear from those who have had one on
the bench.  That radio is probably the most enigmatic of the Hallicrafters
bunch.  Always wanted to put one through sea trials.

Would like to hear both
objective as well as subjective opinions and test results.  Sounds to be some
strong feelings regarding that radio’s performance.  Please for the moment put
the past aside and help me with this project.     

Kindest regards Jim K9AXN 

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