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Title: Tube I.D. Post by: k7mdo 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 Title: Re: Tube I.D. Post by: Steve - K4HX on March 04, 2019, 09:51:13 PM Apparently some sort of strapping 4-1000.
http://n6jv.com/museum/y448.html Title: Re: Tube I.D. Post by: Joe Connor 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 (https://www.eham.net/ehamforum/smf/index.php?topic=17423.0;wap2) Title: Re: Tube I.D. Post by: K1JJ 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 Title: Re: Tube I.D. Post by: KF7WWW on March 05, 2019, 08:28:50 AM Tom AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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 |