From: Garey Barrell 
Subject: Re: [drakelist] T-4XB Tyco Filters


John -

I knew Tyco sounded familar to me.   Aside from the T-R 
relay that is!

I have a T-4XB with blue "C-F Networks - div of Tyco" 
filters and a 17k serial number.  So that puts it right 
about in the middle of the run.  A later B has "Network 
Sciences" silver filters and a 19k serial number, or pretty 
near the end of "B" production.

Guessing earlier units had "C-F Networks" filters before 
Tyco bought them out.  (Like they did Potter & Brumfield and 
a hundred or so other companies.!)

73, Garey - K4OAH
Atlanta

John wrote:

> Hi Garey,
> 
> Thanks for the tip!  I don't know the serial number of the rig the Tyco
> filters came out of, but I'll see if I can obtain it.  I purchased the
> filters for a T-4XB that isn't acting like it should right now.
> 
> 73,
> 
> John W0DC
> 
> ----- Original Message -----
> From: "Garey Barrell" 
> 
> 
>>John -
>>
>>I don't know the answer to your specific question, but you
>>might compare your unit serial numbers to the Serial Number
>>Registry at:
>>
>>http://www89405.temp.w1.com/DrakeSerialDatabase.htm>
>>
>>You should be able to place them in the production.
>>
>>73, Garey - K4OAH
>>Atlanta
>>
>>John wrote:
>>
>>>Anyone have an idea when Drake used USB and LSB crystal filters
> 
> manufactured
> 
>>>by Tyco in the T-4XB transmitter (early/mid/late production)?  (The two
>>>T-4XB's I've owned up to this point have used CF International filters)
>>>
>>>Thanks,
>>>
>>>John
>>>
>>
> 
> 

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