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 Post subject: ID this tube...octal triode
PostPosted: Aug Sat 14, 2021 8:43 pm 
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Joined: Mar Sun 25, 2018 3:00 am
Posts: 136
Location: Berryville, VA
The markings on this tube have faded where they are illegible. Has separate plate and grid caps, single triode. Plates resemble that found in a 6J5 or 6SN7. Probably not useful for much but just curious as to what it is.


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 Post subject: Re: ID this tube...octal triode
PostPosted: Aug Sat 14, 2021 8:53 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3942
Location: Boston, Massachusetts
Looks like a transmitter tube.

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 Post subject: Re: ID this tube...octal triode
PostPosted: Aug Sat 14, 2021 9:43 pm 
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Joined: Jan Sat 12, 2008 12:25 am
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Location: Kingwood, Texas
Looks like a 2C22.

Darrell


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 Post subject: Re: ID this tube...octal triode
PostPosted: Aug Sat 14, 2021 9:56 pm 
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Joined: Mar Sun 25, 2018 3:00 am
Posts: 136
Location: Berryville, VA
Think that's it. Equivalent to a 7193 and I think I can barely make out a 7 on the side of the glass.

Looks like some of the audiophile guys like to sub it for a 6J5 for a more interesting looking tube. I'll have to rig up a 2nd top cap lead to test it on my Hickok.


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 Post subject: Re: ID this tube...octal triode
PostPosted: Aug Sun 15, 2021 12:33 pm 
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Location: Sunbury, Ohio 43074
Looks like an R2D2 to me .... :mrgreen:

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 Post subject: Re: ID this tube...octal triode
PostPosted: Aug Sun 15, 2021 7:34 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1485
Location: Orlando, FL, USA
The 2C22/7193 is equivalent to the 6J5GT or 1/2 a 6SN7GT. Connections at the top lower interelectrode capacitances and allow for transmitter use.

Jim Cross


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 Post subject: Re: ID this tube...octal triode
PostPosted: Aug Tue 17, 2021 6:41 pm 
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Joined: Oct Sun 18, 2015 2:49 am
Posts: 410
Location: San Angelo, TX
I read in an old radio magazine that tubes could be dipped in ammonia to raise the numbers. Anybody tried that? Denis


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 Post subject: Re: ID this tube...octal triode
PostPosted: Aug Sat 21, 2021 4:20 pm 
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Joined: Jan Fri 17, 2014 7:26 am
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Location: In the village, 19115
Those are also known as "rabbit ear tubes". I wonder why? :D

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