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Old Yesterday, 08:57 AM   #1
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Join Date: Jan 2006
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Default strange Tungsram tube

Hi,
While looking through my collection, I found a tube with no marking other than "Tungsram h5" on it.
The tube has loktal pinout and looks like a kenotron to me.
Anyone has any idea about this tube?
Regards,
Duong
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Old Yesterday, 09:43 AM   #2
davorin is online now davorin  Croatia
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AZ21 !
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Old Yesterday, 10:05 AM   #3
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Made in March 1959 but I don't recognize it. Can you clean the glass or detrmine the type, Pentode, Tetrode etc?
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Old Yesterday, 10:44 AM   #4
davorin is online now davorin  Croatia
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100% tube is AZ21 !
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Old Yesterday, 11:31 AM   #5
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davorin is right, the tube is obviously a rectifier.
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Old Yesterday, 01:15 PM   #6
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Hi,
My tube looks exactly the same as Davorin's.
I've googled AZ21 and indeed this is my tube.
Now I wonder what "h5" means, since there's nothing printed on the tube except what showed on the photo.
Thanks a lot,
Duong
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Old Yesterday, 01:17 PM   #7
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h5 is the date code for March 1959.
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Old Yesterday, 01:39 PM   #8
kevinkr is offline kevinkr  United States
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Just thought I would mention that Kenotron is an uncommon/obsolete usage in English these days, it's origins are back in the 1920s somewhere. The widely understood term would be "rectifier." The first time I ran across it here some years ago I had to look it up.
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Old Yesterday, 05:08 PM   #9
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Yes, in western documents those tubes are usually called rectifier, however i'm a bit more familiar with "kenotron" because I used to read Russian documents where they're called "кенотрон" which is the same as kenotron when you translate character by chracyer from Cyrillic
Also, it's really interesting that my AZ21 and Davorin's have exactly the same datecode "h5"as well.
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