[Hammarlund] Knobs

Wed Dec 14 14:04:44 EST 2011

Look on the back for markings and maybe you can relate to who made them.
Leeds Radio in NYC have some of the old types left.

I have a spinner knob that I am going to put on the 600 as it makes it
easier.  At 60 with retirement due to rheumatism and arthritis, it would be
a help.

Stan

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Subject: Hammarlund Digest, Vol 95, Issue 18

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Today's Topics:

   1. Re: Preselector suggestion? (Gary Pewitt)
   2. SP-600 Cabinet (Stanley Adams)
   3. Re: SP-600 Cabinet (Richard Knoppow)
   4. Re: Hammarlund radios (Richard Knoppow)

----------------------------------------------------------------------

Message: 1
Date: Tue, 13 Dec 2011 19:26:23 -0600
From: Gary Pewitt <garypewitt at centurytel.net>
Subject: Re: [Hammarlund] Preselector suggestion?
To: burnsguitar at yahoo.com
Cc: hammarlund at mailman.qth.net
Message-ID: <4EE7FB3F.6060907 at centurytel.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

MFJ has several of them.  Some are passive and some amplify the receive 
signal.  And some have a switched pass through for a TX.

On 12/13/2011 12:55 PM, Brian Burns wrote:
> Hello All,
>
> As part of answers to my previous postings, several people have mentioned
getting improved performance by adding a preselector. Any suggestions for
particular ones? I'm not a purist, so solid state is Ok by me too.
>
> Cheers,
>
> Brian  Once and future-K6UCD  ex-W5BRO
>
> See my website at :  www.lessonsinlutherie.com
>
> Craftsman Graphics
> 18000 George's Lane
> Fort Bragg, CA  95437
>
> Toll Free: 866-214-9472
>
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-- 
Gary Pewitt   N9ZSV
1500 French Prairie Rd
Booneville, AR  72927

------------------------------

Message: 2
Date: Tue, 13 Dec 2011 20:24:07 -0600
From: "Stanley Adams" <stanleybadams at yahoo.com>
Subject: [Hammarlund] SP-600 Cabinet
To: <hammarlund at mailman.qth.net>
Message-ID: <02e401ccba07$7618dca0$624a95e0$@com>
Content-Type: text/plain;	charset="us-ascii"

The original SP600 often would come in a black steel cabinet and there would
be air louvers on the side and top.  But no holes near the bottom or under
the chassis where the air could flow, my 600 JX works a lot better out of
the cabinet where it is cooler and the dial divisions for accuracy stay
within a half of division to one division on the top band, to me that is
awesome.  Each division represents 10 kc.

I wonder if I Greenlee punch out some holes for air to circulate in the
cabinet as I do not have room nor the desire for a rack.

Stan Adams
Memphis

------------------------------

Message: 3
Date: Tue, 13 Dec 2011 21:09:27 -0800
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
Subject: Re: [Hammarlund] SP-600 Cabinet
To: "Stanley Adams" <stanleybadams at yahoo.com>,
	<hammarlund at mailman.qth.net>
Message-ID: <5360793EBC9B4F74AD81D5BB48AE2E34 at VALUED20606295>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=original

----- Original Message ----- 
From: "Stanley Adams" <stanleybadams at yahoo.com>
To: <hammarlund at mailman.qth.net>
Sent: Tuesday, December 13, 2011 6:24 PM
Subject: [Hammarlund] SP-600 Cabinet

> The original SP600 often would come in a black steel 
> cabinet and there would
> be air louvers on the side and top.  But no holes near the 
> bottom or under
> the chassis where the air could flow, my 600 JX works a 
> lot better out of
> the cabinet where it is cooler and the dial divisions for 
> accuracy stay
> within a half of division to one division on the top band, 
> to me that is
> awesome.  Each division represents 10 kc.
>
> I wonder if I Greenlee punch out some holes for air to 
> circulate in the
> cabinet as I do not have room nor the desire for a rack.
>
>
> Stan Adams
> Memphis

    I've never seen an original SP-600 cabinet like that but 
earlier Super-Pros did come in standard desk cabinets. The 
original SP-600 cabinet is in a gray wrinkle finish a bit 
darker than the panel. These are extra-long cabinets; the 
SP-600 chassis is too long for a standard 14" deep rack 
cabinet. The original cabinets have square perforations on 
the sides and top and underneath along the sides of the 
chassis, they are very well ventillated. The older Super-Pro 
for rack mounting came with a wrap around chassis cover with 
no perforations at all in it. I think the idea was to 
provide shielding but the receivers run very hot in them. 
Perhaps they were meant to be ovens to help stabilize the 
frequency but the receivers ordered for cabinet mounting did 
not have them at all and were in ventillated desk cabinets. 
Same with the power supply. Rack mount SP-600 receivers came 
with a bottom cover, not supplied for the cabinet model, and 
with a single cover over the top of the chassis to prevent 
things from falling into it. This was just a flat sheet 
fastened at the four corners with a plastic gasket along the 
front. It did not close the sides at all. I have only once 
seen a receiver where this cover was not missing. The bottom 
cover may be important for shielding. Both are easy enough 
to make.
     BTW, there _were_ instrument cabinets made that will 
accomodate the depth of the SP-600. My JX-17 came in one. 
Its painted green and has no perforations and obviously came 
from something else.

--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com 

------------------------------

Message: 4
Date: Tue, 13 Dec 2011 21:24:46 -0800
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
Subject: Re: [Hammarlund] Hammarlund radios
To: <kk7iz at cox.net>,	<hammarlund at mailman.qth.net>,	<djed1 at aol.com>
Message-ID: <8BA7699FF64F4E7E85C639E64E701D3D at VALUED20606295>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=original

----- Original Message ----- 
From: <djed1 at aol.com>
To: <kk7iz at cox.net>; <hammarlund at mailman.qth.net>
Sent: Tuesday, December 13, 2011 3:41 PM
Subject: Re: [Hammarlund] Hammarlund radios

>
>
>
>
> SP-400X Was told the fancy knobs were special order. ????
>
>
> I think you got kidded. I spent a year searching for the 
> original tuning knobs.  But it's interesting that the 
> SP-400 has holes for a dust cover- most I've seen were in 
> a cabinet and had no dust cover holes (as the regular 
> SP-200s have). I've got two BC-779s, an A and a B; and a 
> nearly perfect SP-400.  I don't have any room for more.
> Ed  W2EMN
>
     The SP-400 knobs are similar to those used on the 
HQ-129-X. They are not quite like standard "chicken head" 
knobs. I suspect these and the tuning and bandwitch knobs 
may have been custom made for Hammarlund. The earlier 
version of the receiver used a bandswitch with a skirt that 
had the bands marked on it. The SP-400 has a long chicken 
head pointer knob with the bands marked on the panel. I 
never particularly liked this style of knob and always 
associated them with cheap equipment (although that's really 
not fair). The only reason I can think of for this change 
was lowering cost. Hammarlund must have known that the 
SP-400 was a transitional model. The earliest ad for the 
SP-600 I've seen appears in the 1948 edition of the _ARRL 
Radio Amateur's Handbook_. Its a drawing, not a photo. While 
its recognizable its evident from the description that a lot 
of re-design was done before the production receivers were 
released. However, it does have the big knobs. This same ad 
shows the HQ-129-X, appearantly the only receiver being 
offered at the time. The SP-400 is not shown and I suspect 
it was thought the SP-600 would supplant it sooner than 
happened. It would be interesting to know the inside story 
but a lot of companies had problems around this time from 
reconversion and severe post-war inflation.
    Hammarlund seems to have figured out that people like 
big knobs and introduced them on later models like the 
SP-600 and HQ-140. These were definitely custom made for 
Hammarlund.

--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com 

------------------------------

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