[Hammarlund] John R. Leary Mods

[Les Locklear]

Many, many modifications, not all of the receivers he rebuilt had the same 
ones either. Calibrators, 2nd mixer mods, product detector, audio, jacks for 
adding a digital display, chassis modifications, custom built avc circuit, 
voltage regulator tube(s), solid stating the power supply rectifier. He 
would usually build them to the customers specification. I've owned three, 
all were different. Documentation was very poor and mostly hand scribbled 
notes that didn't make a lot of sense to anybody but John. Unfortunately he 
has passed away, so nobody knows for sure exactly how many he built or what 
modifications they had. I do have a list, but it is incomplete.

Some of the modifications worked great, others not as well. One thing about 
the three I owned, they were all "hot" receivers.

The one I presently own is a black wrinkle faced SP-600 that works fabulous 
and is very stable.

YMMV.

Les Locklear
Gulfport, Ms.
DX'ing Since '57
http://www.hammarlund.info/



----- Original Message ----- 
From: "Thomas Clay" <tclay2539 at knology.net>
To: "hammarlund-request at mailman.qth.net" <hammarlund at mailman.qth.net>
Sent: Thursday, May 22, 2008 9:52 PM
Subject: [Hammarlund] John R. Leary Mods


> Does anyone know about the John R. Leary mods for the SP 600?Was it  just 
> a product detector circuit?
> Where can his mod info be found?
> Thanks
> Thomas
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