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Author Topic: 6146 In place of 6JB6 in Drake T4X  (Read 14558 times)
WA4JQS
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Posts: 279




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« Reply #15 on: February 18, 2018, 06:34:56 PM »

YES Sweep tubes will last a good while as long as one remembers to dip the plate and get them tuned as soon as possible. i had a gt 500 and later  3 of the GT 550A units they were great radios other then the audio was a bit too high on the curve and tuning L5 if i recall fixed that problem. really liked the watt meter 4 kw with 5 postion ant switch. regret selling them now. a lot of them ended up on CB over the years and got burnt up because of lack of knowledge on how to tune a radio. think i still have a DC supply for the  550A in the shop somewhere.
73 Tony WA4JQS
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KM1H
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Posts: 5253




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« Reply #16 on: February 25, 2018, 09:05:22 AM »

That was a great conversion article, kicked all the myths and no actual experience comments into the trash where they belong.

Makes me almost wish I still had my pair of T4XC's which were used heavily in CW and SSB contests and the 6JB6's didnt last past 6 months and often less. With a muffin fan over the tube cage it extended to 18 months or so but tubes were cheap then, even matched pairs from Drake.

Carl
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N3AJB
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Posts: 60




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« Reply #17 on: March 09, 2018, 05:21:05 AM »

Best substitute for a 6146 is the 6293. Check out the specs, nearly identical and much more "rugged".

Jon
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G3RZP
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Posts: 1271




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« Reply #18 on: March 10, 2018, 04:10:01 AM »

The data sheet I looked (RCA at http://frank.pocnet.net/sheets/079/6/6293.pdf) lists plate dissipation as 10 watts average CCS: the 6146 family is 20 watts CCS and the 6146B is 27 watts CCS.

So where's the increased in 'ruggedness'?
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W7WQ
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Posts: 330




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« Reply #19 on: March 23, 2018, 05:27:38 PM »

It's doable and many videos/articles on how to do but I tell ya what.......I have LOTS of Drake gear and many are running the original finals.  Operate them properly and you don't have to worry about it.
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WA4JQS
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Posts: 279




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« Reply #20 on: March 23, 2018, 05:56:42 PM »

i have installed fan kits in my tr4cw/rit my B line and my C line. have 4 spare tubes now. since i have over a dozen new 6146A's i was just wondering.
thanks 73 Tony WA4JQS
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WQ7T
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Posts: 2




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« Reply #21 on: March 02, 2019, 07:37:01 PM »

Many, many years ago I replaced the two 6JB6 11 pin sockets out to 8 pin sockets that fit the exsisting holes in my T4XB in order to plug 6146B tubes in instead.   Things were tight trying to get all the leads and components from the old 11 pin sockets onto the 8 pin sockets.  In the end it all fit!    I checked the bias for linear operation of the 6146B’s, adjusted it up and down and ended up right back in the same place where it was set for the 6JB6’s.  In the end this turned out to be simply a physical conversion and way worth it.   The 6146B’s were so much more rugged and I was extremely pleased that the effort turned out so successful.  If I ever get another T4X, T4XB, or T4XC. I won’t hesistate to do this again.  I am considering trying this, if I can get things to fit in a TR4X one of these days as well!   
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WQ7T
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« Reply #22 on: March 03, 2019, 07:57:38 AM »

I meant a TR4C, not a “TR4X”  that I would like to convert the 3 6JB6 tubes to 6146B’s. I have one to restore and think that would be a nice upgrade! 
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G3RZP
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Posts: 1271




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« Reply #23 on: March 03, 2019, 02:46:29 PM »

How easy is it to get matched of three 6JB6s? If it is difficult, that seems to me a good argument for changing....
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WA4JQS
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Posts: 279




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« Reply #24 on: March 12, 2019, 04:48:38 PM »

Next thing is for someone to do it and photo the entire project with step by step details.. Or do one and put out a YT video
 and start an upgrade shop.. 73 Tony WA4JQS
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