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Tube I.D.




 
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k7mdo
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« on: March 04, 2019, 09:25:24 PM »

Somehow, out west, a couple of large tubes have migrated.  None of my books list this tube...  Y-448

A plate cap and 5 pins underneath...  have you seen them used anywhere and what are they?

Thanks, Tom, 73
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Steve - K4HX
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« Reply #1 on: March 04, 2019, 09:51:13 PM »

Apparently some sort of strapping 4-1000.

http://n6jv.com/museum/y448.html
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Joe Connor
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« Reply #2 on: March 04, 2019, 09:51:41 PM »

Tom, it's not much, but here's what I found:

https://www.eham.net/ehamforum/smf/index.php?topic=17423.0;wap2
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K1JJ
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"Let's go sailing, Tommy!" - Yaz


« Reply #3 on: March 04, 2019, 10:02:35 PM »

Yep, it's a very strapping 4-1000A.


The fil is 30A and is normally 21A.  Plus, if it is equivalent to a 4PR-1000A as stated, then the tube has been "blueprinted" and the element tolerances are near perfect.


The extra fil emission and 4PR specs tell me this is probably a tube designed for extreme pulse service. It will still function FB in any other service too.


This is a nice find and a very FB tube if it's in good shape.


T
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KF7WWW
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« Reply #4 on: March 05, 2019, 08:28:50 AM »

Tom

As stated they are a variant of the 4pr-1000. I have one in my collection. I have at least 1 of every 4-1000 variant ever made.

Also, If those tubes are surplus to your needs. I may be interested in them.

73's

Sam
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