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

[David]

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