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MYSTERY TUBE




 
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KB5MD
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« on: March 02, 2018, 07:33:03 PM »

I am beginning restoration on a Hallicrafters HT33A linear amp and have found that the original tube (PL-172) and socket have been replaced by the one shown in
the picture.  There are no markings on the tube and it is a little smaller than the original.  Anyone have any ideas?


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w8khk
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This ham got his ticket the old fashioned way.


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« Reply #1 on: March 02, 2018, 07:36:00 PM »

I also restored an HT-33A.  PL172 from Penta was  good tube.

Yours looks a lot like an Eimac 4CX1000A.

https://frank.pocnet.net/sheets/140/8/8168.pdf

http://www.cpii.com/docs/datasheets/213/4CX1000A.pdf
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Rick / W8KHK  ex WB2HKX, WB4GNR
w4bfs
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« Reply #2 on: March 03, 2018, 04:33:05 AM »

measure the filament voltage to see .... be careful of differences in the 4cx1000 family (A or B)
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Beefus

O would some power the gift give us
to see ourselves as others see us.
It would from many blunders free us.         Robert Burns
KD6VXI
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Making AM GREAT Again!


« Reply #3 on: March 03, 2018, 11:54:14 AM »

Definitely looks 4cx1Kish  ....  I have two variants here, one Eimac and one English Valve Co.  Although slightly different cosmetically, same physically, give or take.

--Shane
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WBear2GCR
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Brrrr- it's cold in the shack! Fire up the BIG RIG


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« Reply #4 on: March 04, 2018, 04:18:40 PM »


I think if I owned that linear, I'd get one of those nice Ruskie ceramic tubes & sockets, buy a spare and
transplant it in!:D

                      _-_-
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_-_- bear WB2GCR                   http://www.bearlabs.com
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