7199 tube used for?

BassGreaser · #1 09-03-2011, 01:09 PM

I have a Sylvania (USA) 7199 tube.. it looks like a preamp type of tube, but where in a pre is it used? Also could it be used where a 12AX7 is used for gain?

Mr. Foxen · #2 09-03-2011, 01:11 PM

Sure that is the right number/are there letters first? Not finding anything here: The National Valve Museum - Search Page

Wouldn't assume it is equivalent to any pre valves,t here were a ton of valve with different pinouts that can short your amp and such.

**B-string** · #3 09-03-2011, 01:28 PM

Very sought after HiFi preamp tube.

BassmanPaul · #4 09-03-2011, 01:35 PM

Quote:

Originally Posted by BassGreaser

I have a Sylvania (USA) 7199 tube.. it looks like a preamp type of tube, but where in a pre is it used? Also could it be used where a 12AX7 is used for gain?

it's a triode-pentode and is in no way exchangeable for any of the 12A-7 series of twin triodes.

BassGreaser · #5 09-03-2011, 01:39 PM

Quote:

Originally Posted by BassmanPaul

it's a triode-pentode and is in no way exchangeable for any of the 12A-7 series of twin triodes.

damn.. now what should I do with this tube?

BassmanPaul · #6 09-03-2011, 01:43 PM

Put it up on Ebay and ask $15 if you know the tube is good. $5 as an "as is" item.

BassGreaser · #7 09-03-2011, 01:47 PM

yeah it's good. It came out of my Ampeg B25B I had after I got it completely retubed and capped. The tech gave it back to me and said it's was still good to use

BassmanPaul · #8 09-03-2011, 02:03 PM

Then keep it as a spare. You never know when you might just need one.

beans-on-toast · #9 09-03-2011, 04:22 PM

Ampeg used the 7199 as a phase inverter in the B25B and B-18 bass amps with the 7027A power tubes.