[AMRadio] HRO-50

Larry WA9VRH wa9vrh at dishmail.net
Tue Nov 27 19:01:44 EST 2007

Hi Todd and all,

Bob W9RAN asked me to download the HRO-50-1 manual from BAMA and try to 
print it for him along with the schematic.

Well I did but the BAMA manual was scanned as JPG's and they are pretty 

I would like to see if someone has an HRO -50-1 manual that I could borrow 
to scan and provide to Bob and to BAMA that is in a more friendly format.

I will be happy to provide postage both ways and also a deposit on the 
manual if needed. I can also provide references to the work I have done on 
other equipment archives.


Larry WA9VRH

----- Original Message ----- 
From: "Todd, KA1KAQ" <ka1kaq at gmail.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Tuesday, November 27, 2007 4:17 PM
Subject: Re: [AMRadio] HRO-50

> On Nov 27, 2007 4:53 PM,  <ne1s at neandertech.com> wrote:
>> ----- Original Message -----
>> Subject: Re: [AMRadio] HRO-50
>> Date: Tue, November 27, 2007 15:48
>> From: "jeremy-ca" <km1h at jeremy.mv.com>
>> > We got plenty of all era HRO's in for service and a jig was not used. 
>> > Once
>> > you got the knack it was easy. The holes in the chassis are there for a
>> > reason.
>> >
>> Hi Carl!
>> Are you referring to the holes in the TOP of the chassis for the high-end
>> adjustments, or holes in tha back of the coil rack, under chassis, for 
>> the
>> low-end adjustments? Neither of my HROs (a 2.5V heater 1935 model, & and
>> HR0-7R) have the latter, so the coil racks need to be removed for the
>> bottom-end-of-range adjustments. I do understand certain models had them,
>> but mine don't :>(
> I'd like to learn more about this process at some point. I know you
> have some experience with the older HROs Larry, and Carl worked for
> National for a number of years, so he probably spits pinwheel dials. I
> figure between the two of you, I should be able to figure it out.
> The rig in question is a '47 HRO C utilizing the HRO 5RA1 receiver.
> I'm trying to put together a set of the 'bright faced' coils, or maybe
> just find the aluminum plates for the coils that came with the set
> (currently a mishmash of types).
> The thing was pretty numb initially. Tweaking a few of the coils
> ever-so-slightly helped, but there's a specific order to follow and I
> know I didn't do this (having no clue what the order is).
> All things being equal (good tubes, proper IF alignment), what is the
> best way to align the coils?
> ~ Todd,  KA1KAQ
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