[Boatanchors] Anyone have Hammarlund HX-500 transformer mod?

[Al Parker]

Hi David,
    I'm pretty sure my manual has those pages in it.  They're not 
terrifically explicit, IIRC.  If they're all 8-1/2 x 11 pgs, I'll scan them 
& email to you, probably tomorrow AM.
    My HX-500 works great, I've had it on recently for the CX CW & fone, 
even had it on AM with good reports.  First time I'd tried AM, and didn't 
expect to hear guys say it sounded good.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

----- Original Message ----- 
From: "David" <texasroadrunner at comcast.net>
To: <boatanchors at mailman.qth.net>
Sent: Sunday, February 17, 2008 6:24 PM
Subject: [Boatanchors] Anyone have Hammarlund HX-500 transformer mod?


Somewhere, there's a Hammarlund HX-500 service bulletin/instruction addendum 
which describes the conversion of the powersupply from a pair of 12AX4s to a 
single 5RU4GYB and replacing adding a solid state rectifier for the bias.

After purchasing 3 HX-500 manuals from separate manual vendors (W7FG, 
Surplus Sales Nebraska, Radioreprints), I've got a collection redundant 
papers including service bulletins and notes, but all missing the important 
transformer/power supply "Improved Power Transformer Replacement" 
instructions.

It's my understanding that after 1 year from it's introduction, Hammralund 
decided to make this change.  Some were factory modified, and some that were 
already in the field could by a field kit and/or wing it on their own.

I'm interested in purchasing a copy of this mod, if someone has it or can 
refer me to a vendor who might.
Thank you in advance
-dave
W5OC
_______________________________________________