ampage
Tube Amps / Music Electronics		 For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

 

7199 substitute


 :
9/24/1997 9:00 PM
marc
 7199 substitute
Has anyone tried a 6GH8 as a sub for a 7199? If you have, are/were there any problems? I've got a chassis froma Kay bass amp, a weak 7199 and a bunch of 6GH8's I'd like to try if it's worth the rewire...TIA for any comments
  
9/25/1997 3:39 AM
Ken Lewellen
I haven't used a 6GH8 but I have used a 6AN8A. Not much to do there, other than rewiring the socket. Let us know how your swap works out if you do it.  
Ken Lewellen
  
9/25/1997 6:08 AM
R.G.
The hifi community uses 6AN8, 6GH8, and 6U8 as subs for the 7199. All different pinouts but all seem to work. Switching to one of the alternates from a 7199 is common for the technically adept amp hacker on old Dynaco amps. Go ahead.
  
9/25/1997 9:02 AM
Steve M.
Marc,  
 
I've done this mod to my Dyna ST-70, FWIW. I got a Sound Values replacement board for my Dyna that is designed to use the 6GH8A instead of the 7199. It works great. From what I understand, the only differences between the two tubes are the pinout, and the 7199 has a twisted filament to reduce hum. Other than that I believe that they are electrically identical.  
 
Hope this helps  
 
Steve
  
9/25/1997 9:14 AM
James
I tried this mod on an old Dynaco and IMO the 7199 sounds "bloomier". I went back to the 7199. I may have had a bad NOS 6AN8A but I doubt it.  
James
  

  Page 1 of 1