[AMRadio] HRO-50

Todd, KA1KAQ ka1kaq at gmail.com
Tue Nov 27 17:17:56 EST 2007

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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