Posted by ck (A) on June 24, 2004 at 01:19:58

Can I substitute the existing 6AC7 metal tube on my Laurel IIX with the various 6sj7, 6sg7 or even the red 5693?

If yes, what sonic difference would I be expecting?

And I notice there are the GT (glass tube) version of the above tubes and the metal case version. ARe they all compatible?

Like to hear..

ck

• No - Chris O 13:23:23 06/24/04 (2)
  In Reply to: use 6sj7 or 6sg7 on Laurel IIX? posted by ck on June 24, 2004 at 01:19:58:

  This circuit was designed for the 6AC7 and using a very different tube like the 6SJ7/5693 will degrade the performace considerably. This tube as relatively little impact on the sound of the amp if it is functioning properly, it is just serving as a type of current source. A transistor can sound just as good in this circuit.
  
  
  

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  • What about 6SK7's or 6SD7GT's ) - Cpwill 08:54:35 06/25/04 (1)
    In Reply to: No posted by Chris O on June 24, 2004 at 13:23:23:

    I believe the Nostalgia Air site shows these as direct subs. Just wondering. The 6SD7GT's are cool looking tubes.
    
    

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    • I would be a bit careful - Chris O 10:38:10 06/25/04 (0)
      In Reply to: What about 6SK7's or 6SD7GT's ) posted by Cpwill on June 25, 2004 at 08:54:35:

      That site does not contain the tube parameters. I have a tube substitution handbook that shows the 6CA7 as a sub for the 6AC7. It just shows that some published substitutions are wrong.

      Same pin out is a bit different then the same electrical characteristics. Now, if it proves out that the tube is an electrical sub, I am all for cooler looking tubes than the rather homely 6AC7.
      
      

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