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 Post subject: is there a sub for a 12SJ7?
PostPosted: Mar Mon 05, 2018 10:56 pm 
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Joined: Feb Sat 28, 2015 10:50 pm
Posts: 461
Location: Decatur Alabama
I have a ton of tubes but not one 12SJ7. Is there anything close I can sub? It is used as an R.F. amp tube in a Mantola 6 tuber. Thanks!
Doc


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 Post subject: Re: is there a sub for a 12SJ7?
PostPosted: Mar Mon 05, 2018 11:56 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 36878
Location: Livermore, CA
Hi Doc

12SH7 would be a replacement for 12SJ7. You could use 12SK7 or 12SG7 since the tube is being used as an RF amplifier.

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Norm


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 Post subject: Re: is there a sub for a 12SJ7?
PostPosted: Mar Tue 06, 2018 12:22 am 
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Joined: Feb Sat 28, 2015 10:50 pm
Posts: 461
Location: Decatur Alabama
Great! I have plenty of 12SK7 and 12SG7 tubes.


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 Post subject: Re: is there a sub for a 12SJ7?
PostPosted: Mar Tue 06, 2018 12:47 am 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 7889
Location: Long Island
The 12SJ7 has no exact substitutes. The other tubes that have been mentioned will work well enough to play the radio on local stations but you may find problems with gain and/or gain control. No harm will be done trying in any case. 12SH7 is the closest match, 12SK7 is the next best, and 12SG7 is a distant match.

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"Hell, there are no rules here--we're trying to accomplish something!"

Thomas A. Edison


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 Post subject: Re: is there a sub for a 12SJ7?
PostPosted: Mar Tue 06, 2018 3:49 am 
Member

Joined: Feb Sat 28, 2015 10:50 pm
Posts: 461
Location: Decatur Alabama
Well, the radio has more problems than mismatched tubes. It just has constant static. I have a feeling I have a bad I.F. transformer. New e caps and paper/wax caps, fresh tubes. Oh well. Thanks for all the help on the tube subs though.


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 Post subject: Re: is there a sub for a 12SJ7?
PostPosted: Mar Wed 07, 2018 12:21 pm 
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Joined: Nov Mon 02, 2009 7:01 am
Posts: 2982
Location: Lincoln City, OR
Greetings to Doc and the Forum:

A quick check of my tube supplier bookmarks revealed 3 vendors who have the tube at prices ranging from $3 to $5. They don't appear to be especially rare or expensive.

Regards,

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Jim T.
KB6GM


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