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Amperex Bugle Boy 6BL8/EFC80............

67.189.12.91

In Reply to: RE: Best 7199 Substitution posted by Bubbasweet on July 03, 2011 at 17:01:59

...not well known and cheap. Same pinout as 6U8/6GH8 etc. They probably measure like crap, but I don't listen to a scope; I'm still using an amp to power my speakers for the moment.
And to stir the pot a bit more, sonically I prefer the triode/sharp cutoff pentode tubes to an all triode front end. Maybe I prefer the greater distortion, or the spectra of that distortion, or the demons have completely taken over my brain.
And to answer your earlier question, while 6U8, 6BL8 and 6GH8 can be subbed for one another without issue, the tubes are actually a bit different in their electrical characteristics which will result in different subjective sounds.

Edits: 07/06/11

Follow Ups:

RE: Amperex Bugle Boy 6BL8/EFC80............ - GP49 20:54:57 07/09/11 (4)
Minor nitpick: the alternate designation for the 6BL8 is *ECF80*

It was used by Dynaco, not in an amplifier, but in the FMX-3 multiplex adapter and the FM-3 tuner.

GP49
- Thanks for the correction. A common tube in Scott and Stromberg-Carlson integrateds as well. nt - viridian 12:35:14 07/12/11 (3)
  nt
  - RE: Thanks for the correction. A common tube in Scott and Stromberg-Carlson integrateds as well. nt - Bubba 20:58:25 07/13/11 (2)
    I broke down and bought 2 Jan Philips USA 7199s. 5 Modern Mullard 12ax7s and I also bought a 6 pack of NOS GE 6ea8..
    
    I was looking close at the 6ea8 compared to the Jan 7199. The are very close. Almost identical in construction. So what does the big supposed tonal difference come from?
    - RE: Thanks for the correction. A common tube in Scott and Stromberg-Carlson integrateds as well. nt - GP49 07:18:22 07/14/11 (1)
      I don't have direct knowledge of exactly what is different, but much of what determines how a tube functions is invisible without destroying the tube and taking the guts apart: how the grid is wound and spaced, both between its own windings and from the cathode and plate. The way audiophiles identify tubes by ribs and ridges and stuff on their plates is only that...a means of identification. The plates actually have far less to do with how a tube functions than the grid.
      Can you tell by a non-destructive look that a cross-section of an EL34's grid windings are a different shape from those in a 6550 or KT88? Didn't think so. And that's a much bigger tube than a nine-pin miniature like a 7199 or 6EA8.
      
      GP49
      
      Edits: 07/14/11
      - RE: Thanks for the correction. A common tube in Scott and Stromberg-Carlson integrateds as well. nt - Bubba 21:10:57 08/21/11 (0)
        
        In Reply to: RE: Thanks for the correction. A common tube in Scott and Stromberg-Carlson integrateds as well. nt posted by GP49 on July 14, 2011 at 07:18:22
        
        I tried the subs and they sound fine to me..

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