[Hammarlund] HQ-170 Query

[Kim Elmore]

I have an HQ-170 purchased new by my dad (W5JHJ SK 2007) in 1949. It has 
developed a problem, characterized by an incinerated resistor on a line 
coming off of pin 6 of V5 (third mixer). I no longer have the original 
manual and I cannot find a serial number ion it anywhere. I have seen 
(but no longer have) the original purchase receipt for it, dated May 
1959. I've determined that there are at least four different schematics 
for the receiver for various production upgrades. I'd like to ensure I'm 
looking at the right schematic, but without a serial number I'm a bit in 
the dark. It's in beautiful condition since he, and later I, took great 
care of it.

I'm not as familiar with the HQ-170 as I am with his WRL Globe Champion 
350, also purchased new by him in June 1959, and slo in superb 
condition. I've worked on the Champ a fair bit (now needing a LV 
transformer replacement) but aside for alignment and preventive 
maintenance/electrolytic capacitor replacements in the HQ-170, this is 
the first time I've had to get into it. How do I know which schematic is 
the correct one to use?

73,

Kim Elmore N5OP

P.S.: The HQ-170 is currently off of the bench so that I can address the 
Champ's LV transformer replacement.

-- 
Kim Elmore, Ph

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, UAS, N5OP, 2nd Class Radiotelegraph, GROL)

/“Listen, it's too big a world to be in competition with everybody else. 
The only guy I have to get better than is who I am right now.” – Col. 
Sherman T. Potter, 4077 M.A.S.H./