[Hallicrafters] DD-1 Audio amplifier |
Richard Knoppow
1oldlens1 at ix.netcom.com
Fri Feb 24 21:05:02 EST 2012
----- Original Message -----
From: "Lloyd Godsey" <kk7iz at cox.net>
To: "'Carl'" <km1h at jeremy.mv.com>; "'rbethman'"
<rbethman at comcast.net>; <hallicrafters at mailman.qth.net>
Sent: Friday, February 24, 2012 5:13 PM
Subject: Re: [Hallicrafters] DD-1 Audio amplifier
> Not to mention the Hammarlund AN/FRR-12
>
> Thanx
> Lloyd Godsey KK7IZ
> kk7iz at cox.net
> 480-620-7145
> http://www.lloydsdipsydumpster.com/
> http://antiqueradioarchives.com/
>
>
> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf
> Of Carl
> Sent: Friday, February 24, 2012 4:09 PM
> To: rbethman; hallicrafters at mailman.qth.net
> Subject: Re: [Hallicrafters] DD-1 Audio amplifier
>
> National had a diversity model of the NC-183 around 1947
> and Hallicrafters
> SX-28's were used during WW2.
>
> National also built big racks full of special diversity
> receivers under some
> FRR-nn contract.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "rbethman" <rbethman at comcast.net>
> To: <hallicrafters at mailman.qth.net>
> Sent: Friday, February 24, 2012 4:21 PM
> Subject: Re: [Hallicrafters] DD-1 Audio amplifier
>
>
>> Long before the SP-600-JX series, there was a Northern
>> Radio Diversity
>> version of the SP-600 J-11(No X), that was on a Navy '51
>> contract. It
>> required two receivers and also the Northern Radio LMO to
>> keep both
>> receivers in sync frequency wise.
>>
>> I've got one, I've seen a few others. One could select
>> either the
>> internal LO or the external LMO.
>>
>> Bob - N0DGN
Somewhere I've seen pictures of modified Super-Pro
receivers in double or triple diversity systems. Equipped
with means for an external LO. All the modifications are
fairly easy to do.
My BC-779 had been modified at some time for a crystal
oscillator. It had been removed when i got the receiver but
the holes for the knobs over the main tuning dial were still
there as was a hole in the top cover of the tuning unit just
over the main tuning capacitor for the LO. Very similar
arrangement to the SP-600-JX. Mine did not seem to have been
modified to bring out either the AVC, IF or detector so
perhaps it was simply a switchable fixed frequency receiver.
BTW, the Super-Pro has an interesting audio amp, a
Class-B or near it amp using triode connected 6F6 tubes and,
like the DD-1 with an interstage transformer. The audio
quality is very good.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com
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