[Hammarlund] HQ-180 service bulletins and recommended mods

[Les Locklear]

The HQ-180A had the filament transformer that kept the oscillator and mixer filaments on. The HQ-180 doesn't.

Les

> To: hammarlund at mailman.qth.net
> From: jeff at podengo.com
> Date: Mon, 23 May 2016 22:19:26 -0400
> Subject: [Hammarlund] HQ-180 service bulletins and recommended mods
> 
> Hi All -
> 
> Just found a good HQ-180, and have it on the bench for its initial 
> walk-through.  The BAMA site has the manual for this particular one in 
> the "issue3" sub directory -- it looks somewhat different than the other 
> 180s I've seen.  I would say it's probably an older one, but I don't 
> know for sure.  The serial number is 631.
> 
> Previous owner put a toggle switch on the back that seems to control the 
> AC line. I haven't figured out why yet -- as it took me a minute or two 
> to figure out how to turn it on (it has a clock...  my other ones don't).
> 
> I plan on pairing it with the HX-500.  Here's the question to you 
> Hammarlund experts: any mods that ought to be done?  I've read that 
> people "convert them to the HQ-180A," but this seems more involved than 
> just putting some diodes in and upping the B+ dropping resistor from 2K 
> to 3K.
> 
> This one is pretty badly out of alignment, but the filter caps seem 
> good. After replacing a few tubes, it hears signals, but audio is poor 
> -- no recapping yet.  It also doesn't appear to have the secondary 
> filament transformer that lights the oscillator and mixer full time, so 
> I expect a bit of drift.  Can anyone offer any insight on this 
> particular edition of the 180?
> 
> Thanks!
> 
> Jeff
> WB3JIH
> 
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