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Post new topic 7199 to 6U8 Adapter
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Author Topic:  7199 to 6U8 Adapter
Randy Owens


From:
West Central Indiana, USA
Post Posted 23 Apr 2017 2:22 am     Reply with quote

I know this is a stretch but I know that a lot of us like to use vintage gear. My Ampeg G-15 uses a 7199 tube which is no longer in production. They're out there but most that I have seen are $50+. There is an adapter that plugs into the socket that changes the pinout of the tube so that you can use a 6U8 tube which is supposed to be electrically identical and about $10. The tube and adapter can be purchased together for about $25. According to my tube tester, my 7199 is still good for now but all tubes are perishable!

The other option would be to rewire the tube socket as a more permanent modification. The mod is simple but I haven't verified it with another source. (proceed at your own risk):

Step 1. Remove wire from pin 2 and relocate it to pin 6
Step 2. Remove wire from pin 6 and relocate it to pin 7
Step 3. Remove wire from pin 7 and relocate it to pin 2

I guess I'd like to know if any of you have tried the socket adapter and a 6U8 tube. Would you do the socket rewire and call it good...noting the change on the tube chart? Obviously a NOS 7199 would be the correct way to do it but the supply is finite. A NOS tube could outlive me though. I believe the one that is in it is the original tube from 1965.

This amp is a great old survivor that sounds outstanding. I'd like to keep it around a good long time. I replaced the filter caps and and have installed a 3 wire power cord in the name of safety.
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Mullen RP, Walker S/S, Lexicon MX-300, Walker cabs w/vintage D130s, Session 400, Stage One pedal, Bars from BJS and Hillman

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Cartwright Thompson


Post Posted 23 Apr 2017 3:11 am     Reply with quote

If I were you, I'd just avoid the hassle of modifying the amp and bite the bullet and shell out for a n.o.s tube. Like you said, it will most likely outlast you.
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Michael Butler


From:
California, USA
Post Posted 23 Apr 2017 9:52 am     Reply with quote

the hifi/audio people use the 6u8/a or 6gh8a with the adapter quite often. $25 for the adapter and tube is not a bad price for a backup system. it appears that the 6gh8a is more highly thought of. here is a link to amplified parts/tubesandmore/antique electronics as to their products.

https://www.amplifiedparts.com/search/node/6gh8a

and, a link to tubedepot who use the 6u8/a.

https://tubedepot.com/t/tubes/preamp-tubes/7199

and, a link to a google search about the 6u8a vs. 6gh8a

https://www.google.com/search?q=6u8a+vs+6gh8a&ie=utf-8&oe=utf-8

play music!
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Randy Owens


From:
West Central Indiana, USA
Post Posted 23 Apr 2017 10:32 am     Reply with quote

Yes indeed. I've been to various links pertaining to the conversion and adapters. Some do prefer the 6GH8A and some prefer the 6U8A. The interesting thing is that people seem to prefer either of those tubes to the original 7199! I'm going to see what I can dig up on the 6GH8A conversion. If it's the same as the 6U8, I'd have an additional option using an adapter. If it's not, it's no big deal. Both tubes and their adapters are cheap enough to experiment with.
_________________
Mullen RP, Walker S/S, Lexicon MX-300, Walker cabs w/vintage D130s, Session 400, Stage One pedal, Bars from BJS and Hillman

"Don't worry about things that don't matter.."
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