[Boatanchors] HRO-500 Data Sought

[WA5CAB at cs.com]

Carl and others,

Around (from dates in my database) mid 1993 someone I knew who at the time 
lived in MASS bought some or most or all of what was being hauled out of the 
National factory building.  I don't recall the details of why it was being hauled 
out at that time.  He re-sold most of the paper to me around 11/11/93.  As my 
specialty is and has been for nearly half a century military radio manuals, I 
didn't get much out of it that I actually wanted but didn't trash any of it.  
Over the ensuing years, I've sold some of the original equipment manuals, in 
some cases to include the final one which I don't normally do.  

On the HRO-500 specifically, I retained one Series 75 manual and one that has 
printed on the back cover Series 122 but that someone has written on the 
front cover Series 88.  The latter one I scanned a number of years ago and can 
print (I do have a stack of originals of the two foldouts Fig 50 and 51).  There 
is also a stack of original sales sheets (one sheet, front and rear).  And 
from one to a stack of the following, mostly undated:

ALTERNATE PROCEDURE FOR ALIGNING HRO-500 SYNTHESIZER.  5 pages.  I don't know 
what it's an alternated to.

Instructions for Disassembly and Reassembly of HRO-500 Main Tuning Dial and 
Ball Drive Mechanism.  3 pages.

INSTALLATION INSTRUCTIONS FOR TWO-SPEED HRO-500 PW DIAL.  2 pages

ADDENDA TO THE HRO-500 SERIES 88.  4 pages (these changes seem to be all 
incorporated in the Series 122/88 manual I have).

CSB 66-3 dtd June 9, 1966.  2 pages (apparently updates to earlier models 
including Series 75).  Signed by C. W. Huether.

ASB 65-1 dtd June 15, 1965.  7 pages.  Also has info for NCX-5, NCX-A and 
NCX-D.  Printed but not signed, Harvey Whitmore.

ASB 65-2 dtd September 22, 1965.  1 page.  Signed by Harvey Whitmore.

RECOMMENDED SPARE PARTS KIT FOR HRO-500.  2 pages.  

Finally, a 3-page copy of what appears to be a handdrawn and lettered 
checklist.  At the top of each page drawn in hollow letters is "HRO-500".  It begins 
with +12V, +11V, +10V, +8.5 AGC PNT, +7.5 BFO ENABLE...  That's down the left 
side of the page.  The right side of the page mostly seems to show what you 
should do or what you should read in order to put a check mark in the block.  I 
don't think it is complete.  The bottom of Page 3 ends with CHECK DIAL EVERY 
10 KC.  The right side says READ f @ J5 plus some details.



In a message dated 2/11/2009 12:49:27 PM Central Standard Time, 
km1h at jeremy.mv.com writes: 
> Id appreciate copies also, I believe I authored at least one of them.
> 
> My current 500 is a series 122 with LF-10, speaker and NIB rack mounts. 
> Sold a 75 series with all docs including production allignment procedure 
> around 88. Been wondering who has that alignment info stashed away.
> 
> Carl
> KM1H
> National Radio 1963-69
> Service Tech, Service Manager

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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