[Kenwood] TS-520/TS-520S Neutralization

Sat, 24 Apr 2004 09:48:54 -0600

I'll go with what Glen Zook taught.   I've used the W version in mine 
for two years at full throttle without any problems.

Clif Holland wrote:

>The TS520's were designed for the S2001A tube. The direct replacement for
>the S2001A is the 6146B. Nuff said.
>
>Clif Holland, KA5IPF
>AVVid
>Authorized Kenwood and Icom Service Center
>816 W Shady Grove Rd
>Irving, TX 75060
>
>www.avvid.com
>
>1-800-214-5779
>972-870-0630 (local)
>
>
>----- Original Message ----- 
>From: "Ray Friess" <[email protected]>
>To: "Larry, K4WLS" <[email protected]>
>Cc: "Donald E. "Buck" Stiles" <[email protected]>; <[email protected]>
>Sent: Saturday, April 24, 2004 9:31 AM
>Subject: Re: [Kenwood] TS-520/TS-520S Neutralization
>
>
>  
>
>>I got my information and 6146 tutorial from Glen Zook K9STH, who is an
>>acknowledged expert
>>on 6146 tubes and their successors.  He has answered the question about
>>using 6146W tubes
>>many times....   I have used them in one of my ts 520 rigs for a couple
>>years now without any
>>problems at all.  When the original tubes in my second ts 520 go, I will
>>replace them with W's
>>as well.   I have 100 of the tubes........   all brand new.
>>Here's his web site and here's a portion of what he said just recently...
>>
>>http://home.comcast.net/~k9sth
>>http://home.comcast.net/~zcomco
>>
>>Unless you want some pretty "hairy" experience with
>>neutralization (and they may or may not neutralize) do
>>
>>not use 6146B tubes or any 6146W tubes with a "code
>>date" later than 1964 (which are basically the same
>>tube as the 6146B).  Sometimes the 6146B works in
>>equipment that was originally designed for the
>>6146/6146A/8298 series, but using the 6146B/8298A
>>often results in all sorts of problems.
>>
>>
>>
>>Larry, K4WLS wrote:
>>
>>    
>>
>>>6146W's are NOT a direct replacement for 6146B's. The
>>>6146W's are the miltary version of the 6148B. Nice thing
>>>about the 6146W is they are built to Mil Specs and are more
>>>rugged than the 6146B. They were originally conceived to
>>>run in the old military VHF equipment. Big problem, the plate
>>>dissipation power of the 6146W is only 75W compared to
>>>90W for a 6146, 5146A, and 6146B.
>>>
>>>The 6146B has a plate dissipation power of 90W, so two
>>>of them in parallel can be run at 180W input on CW.
>>>
>>>The 6146W only has a plate dissipation power of 75W, so
>>>two of the can be run in parallel for 150W input on CW. If
>>>you are running 6146W's better lower the Drive Level on
>>>CW or the Mic Gain on SSB. Otherwise you are risking
>>>lowering the life of the tubes, failure of a tube, and associated
>>>damage to other components in the finals, especially the
>>>sreen grid resistors.
>>>
>>>Plate Dissipation Power (Power Input per Tube) = 1/2 Ip
>>>(total plate current - actually cathode current minus screen
>>>current) X (plate voltage or key down HV on meter). This is assuming both
>>>tubes are perfectly matched and are conducting the same amount of
>>>      
>>>
>current.
>  
>
>>>Unless you have a matched pair of finals (which you should always run in
>>>parallel power amps), most
>>>likely one tune is conducting more than the other. All the more
>>>reason to stay away from 6146W's.
>>>
>>>If you have 6146W's in your rig, tune up on CW and advance
>>>Drive Level to 225 mA (180W input with key down HV of 800V).
>>>Hold key down one or two seconds and watch Ip start
>>>dropping. Hold key down longer and listen the the crackling
>>>as the plates start getting very hot as the plate dissipation
>>>power is being exceeded. If rig covers were off, and final
>>>cage removed, hold key down a bit longer and watch the plates
>>>start glowing cherry red as the crackling due to heat gets more
>>>intense.
>>>
>>>If your key down HV is more than 800V, do Ip = Key Down HV/
>>>180W to get the Ip to advance the Drive Level to, to try this little
>>>test on 6146W's.
>>>
>>>If you use 6146W, they only good for 150W input - you should
>>>always run a matched pair of 6146B's in your Kenwood tube
>>>rigs for best performance.
>>>
>>>Also, you most certainly can use a 6146 or 6146A as a
>>>replacement for a 6146B in all TS-520 thru TS-830S as
>>>long as the tubes are good.
>>>
>>>You guys need a good Transmitting Tube Manual such as that
>>>put of by RCA or GE, EIMAC - they are still in print.
>>>
>>>Larry,  K4WLS
>>>
>>>From: "Ray Friess" <[email protected]>
>>>Subject: Re: [Kenwood] TS-520/TS-520S Neutralization
>>>
>>>
>>>Don:
>>>I also have a ts 520 .... two of them in fact.  I recently retubed the
>>>finals in one of them using
>>>6146W tubes and have had no trouble with neutralization once done.
>>>The 6146B is the American version of the finals that come with the
>>>Kenwood, and you can use
>>>6146 W in place of 6146B, but NOT for a 6146 or 6146A...
>>>Ray wa7itz
>>>
>>>
>>>Donald E. "Buck" Stiles wrote:
>>>
>>>
>>>
>>>      
>>>
>>>>Kenwood listees,
>>>>
>>>>I needed replace the tubes and my TS-520.  I have a 6146W tubes
>>>>        
>>>>
>available,
>  
>
>>>>however, I am concerned that I will not be able to neutralize these
>>>>        
>>>>
>tubes.
>  
>
>>>>The normal tubes are the 6146/6146A variety.  Has anyone had experience
>>>>neutralizing the 6146W in the TS-520/TS-520S?
>>>>
>>>>Any suggestions appreciated.
>>>>
>>>>73 de N8CSP k
>>>>
>>>>
>>>>- - -
>>>>
>>>>Your moderator for this list is:
>>>>Larry Wilson KE1HZ [email protected]
>>>>
>>>>_______________________________________________
>>>>Kenwood mailing list
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>>>>http://mailman.qth.net/mailman/listinfo/kenwood
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>- - -
>>>
>>>Your moderator for this list is:
>>>Larry Wilson KE1HZ [email protected]
>>>
>>>_______________________________________________
>>>Kenwood mailing list
>>>[email protected]
>>>http://mailman.qth.net/mailman/listinfo/kenwood
>>>
>>>
>>>
>>>
>>>
>>>
>>>      
>>>
>>- - -
>>
>>Your moderator for this list is:
>>Larry Wilson KE1HZ [email protected]
>>
>>_______________________________________________
>>Kenwood mailing list
>>[email protected]
>>http://mailman.qth.net/mailman/listinfo/kenwood
>>
>>    
>>
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