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strange Tungsram tube
strange Tungsram tube
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Old 21st October 2014, 08:57 AM   #1
hoangduongo is offline hoangduongo
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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 21st October 2014, 09:43 AM   #2
davorin is offline davorin  Croatia
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AZ21 !
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Old 21st October 2014, 10:05 AM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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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 21st October 2014, 10:44 AM   #4
davorin is offline davorin  Croatia
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100% tube is AZ21 !
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Old 21st October 2014, 11:31 AM   #5
Vincent77 is offline Vincent77  Europe
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davorin is right, the tube is obviously a rectifier.
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Old 21st October 2014, 01:15 PM   #6
hoangduongo is offline hoangduongo
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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 21st October 2014, 01:17 PM   #7
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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h5 is the date code for March 1959.
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Old 21st October 2014, 01:39 PM   #8
kevinkr is offline kevinkr  United States
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strange Tungsram tube
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 21st October 2014, 05:08 PM   #9
hoangduongo is offline hoangduongo
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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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