[Hammarlund] SP-600/Black Beauties/Transitional Piece?

[James Barrie]

For what it's worth, my HQ-170 ( sn 1542) has no bb's in it... all  
disks. There's a stamp, July 17, 1957, on the chassis
Jim
WA8SDF
On Mar 8, 2012, at 12:53 PM, James A. (Andy) Moorer wrote:

> Various sub-assemblies, like the cans and the terminal strips, were
> assembled separately and stocked separately (assuming Hammarlund used
> the common production techniques of the time). Some of the manuals,  
> like
> the Air Force ones, show these assemblies before they are installed in
> the radio. All the dangling leads stick straight out, ready for
> connection. There would have been a number of hybrids that used up the
> remaining stock of the various sub-assemblies - I would guess maybe as
> many as a hundred or so would have mixtures of ceramics and BBODs.
>
> -A
>
> -- 
> James A. (Andy) Moorer
> www.jamminpower.com
>
>
>
> On 3/8/2012 9:18 AM, Joe Connor wrote:
>> I'm currently working on an SP-600 JX-17 serial number 17,2XX.  
>> Under the chassis, it has all ceramic-disk caps that appear to be  
>> factory-installed. I breathed a sigh of relief because that will  
>> save me a lot of work. According to the literature, Hammarlund  
>> converted to ceramic disks at around serial number 17,5xx. I  
>> figured I had lucked out.
>>
>> As I went into the IF cans to make sure the resistors were within  
>> spec, I was surprised to find that both 455khz IF cans had black  
>> beauties. They were, of course, leaking badly. The 3,955khz IF can  
>> had ceramic disks. I opened the T-9 can and looked into the RF deck  
>> with a flashlight and saw all ceramic disks. It was strange that  
>> only these two IF can had black beauties. Maybe Hammarlund was  
>> simply using parts that it had on hand?
>>
>> The morale of the story seems to be this: even if you have a set  
>> that appears to have all original ceramic disks, it's a good idea  
>> to peak into the hidden areas to make sure that a black beauty or  
>> two aren't lurking about.
>>
>>
>>                                    Joe Connor
>> _
>
>
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