[Hammarlund] HQ140X questions

Wed Dec 13 15:32:23 EST 2023

Let's see if this attachment works...

If not let me know and I'll send a copy.

Les

----- Original Message -----
From: Les Locklear <leslocklear at hotmail.com>
To: Dan Martin <pitfit at comcast.net>, <ray2.s at btinternet.com>
Cc: <hammarlund at mailman.qth.net>
Sent: 12/13/2023 1:45:50 PM
Subject: Re: [Hammarlund] HQ140X questions
________________________________________________________________________________

> Regarding Hammarlund receiver serial numbers. The only way I am aware of is to 
> see the date code on the Crystal, the filter electrolytic can (if original) or,
> a stamp on the inside of the front panel.
>  
> I have owned several of the HQ-150 series, the serial numbers on them were: 
> B6035, B6440, B6084, 5096, B6597. One HQ-140-X 3988. I wasn't curious enough back in those days to either check or write down Crystal or Filter Cap dates. I have no clue why some serial numbers were preceded by a letter (B in these examples).
>  
> I'm not aware of any internal Hammarlund memos or records showing that serial numbers had a date code in them.
>  
> Having said that, many years ago the noted author, collector and antique radio 
> historian and collector Alan S. Douglas (a SK since 2015) collaborated on an 
> informal
> survey of The serial numbers of the Hammarlund SP-600 receivers. We came to the 
> conclusion that the suffix ((model) numbers had no bearing on the serial numbers
> which were sequential no matter if it was a JX-14 or JX-26 there are instances 
> of the earlier model numbers having a higher serial number than a JX-26 or JX-
> 39. The separate serial numbers stamped on the separate Military tags (usually 
> on the top L.H. upper corner of the front panel) corresponded to how many that 
> particular military contract number were built. Alan and I agreed that 
> contracts were filled simultaneously, so the model designations were hopelessly 
> scrambled. Alan noted
> the serial numbers are apparently "real" since they track very well with the 
> date codes on the electrolytic capacitors, and the bathtub capacitors located 
> along the rear panel of SP-600's.
>  
> The highest SP-600 serial number recorded ( I once owned it) was a JX-17 serial 
> number 20137. In Hammarlund's later years at the Mars Hill manufacturing plant
> The started used metallic foil labels on both the HQ and SP-600 receivers that 
> had an entirely different series of numbers. As an example a HQ-180A serial 
> number
> 30038202. Is there some sort of code as to build date? I have no idea.
>  
> However I do have a great deal of information regarding the build dates and the 
> model (suffix) numbers along with contract numbers and some differences (if 
> any) on the various models.
>  
> That information is available here: https://www.hammarlund.info/sp600.html  You 
> will notice that these were extrapolated from ECN (engineering change notes), 
> so dates are only approximate.
>  
>  
>  
>  
>  
> 
> ----- Original Message -----
> From: Dan Martin <pitfit at comcast.net>
> To: <ray2.s at btinternet.com>
> Cc: <hammarlund at mailman.qth.net>
> Sent: 12/13/2023 12:39:21 PM
> Subject: Re: [Hammarlund] HQ140X questions
> ________________________________________________________________________________
> 
>> Yep, this is a mod. A means to enter the path between the output of the mixer, 
>> pin 5, and the first IF can, Z1, which has as an internal component, T1. Pin 5 
>> has 200-plus VDC on it, by the way.
>> 
>> Hammarlund serial numbers are a mystery, at least to me. I have both an HQ-140 
>> and HQ-150, both identical but for the Q-multiplier in the 150. My 140 has a X-
>> XXXX stamped on the back where all characters are numbers. The 150 also has X-
>> XXXX stamped on the back but the first character is a letter. Go figure! Both 
>> were made in the same mid-late 50’s era and may have even been made 
>> concurrently for a short time, at least.
>> 
>> Both are fine single conversion receivers and among my favorites.
>> 
>> Dan
>> WB4GRA
>> 
>> Sent from my iPhone
>> 
>>> On Dec 13, 2023, at 12:45 PM, Ray G3XLG via Hammarlund 
>>> <hammarlund at mailman.qth.net> wrote:
>>> 
>>> ?Just had a look Richard, the centre pin of the strange chassis connector
>>> goes via a 56K resistor to pin 5 the anode of V3 the mixer.
>>> 
>>> A blue wire also on pin 5 goes up through the chassis to T1 between the
>>> mixer and the first 1st IF.
>>> 
>>> I think you are right it's a Ham mod, perhaps to feed a signal generator?
>>> 
>>> 73
>>> 
>>> Ray G3XLG
>>> 
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>> 
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> 
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> ** For Assistance: gharmon at idworld.net **
> 
> 
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