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Posted by Capt. Z (A) on June 30, 2009 at 19:34:02

In Reply to: RE: EL34 comparisons posted by Michael Samra on June 30, 2009 at 16:13:57

I bought some JJ KT77 from Mike over a year ago and so far had no negative issues with them.

Recently I got some re-issued GL KT77. They now have about 100 hours on them and so I did a brief comparisson between both.

GL KT 77 have full and warm mids, less highs than the JJ
JJ KT77 are lean in comparsisson to the GL and have more highs

Well, at the moment I am using one JJ and one GL KT77 in each channel, since my amp runs in PP.

Sounds pretty good so far. Combines the fuller mids and extended highs.

• RE: EL34 comparisons - plavcan 13:29:29 07/01/09 (1)
  In Reply to: RE: EL34 comparisons posted by Capt. Z on June 30, 2009 at 19:34:02

  Pardon my ignorance, but what's PP?
  
  Is a GL/JJ combo something that might work in an ST-70?
  
  Thanks
  

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  • RE: EL34 comparisons - Capt. Z 14:55:03 07/01/09 (0)
    In Reply to: RE: EL34 comparisons posted by plavcan on July 01, 2009 at 13:29:29

    PP stands for Push Pull, in contrast to SET - Single ended triode.
    
    The JJ/GL only works if you can adjust the bias individually for each tube, since they have different bias points (according to my biasing aid in my amp)
    

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• RE: EL34 comparisons - Michael Samra 19:58:29 06/30/09 (2)
  In Reply to: RE: EL34 comparisons posted by Capt. Z on June 30, 2009 at 19:34:02

  Capt
  Thats about what I found exactly.Its hard to pick a winner because they both do different things well.
  If the power supply waveform isn't pretty,neither is the sound in most cases.
  
  

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  • RE: EL34 comparisons - bkrop 19:43:21 07/03/09 (1)
    In Reply to: RE: EL34 comparisons posted by Michael Samra on June 30, 2009 at 19:58:29

    Have you tried any 6l6 or other power tubes in your scott 240's?
    I have a rebuilt pair and was told I could try some other power tubes and have never gotten around to it.
    

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    • RE: EL34 comparisons - Michael Samra 21:47:18 07/04/09 (0)
      In Reply to: RE: EL34 comparisons posted by bkrop on July 03, 2009 at 19:43:21

      bkrop
      I havent in the scotts because I would have to raise the neg bias voltage to run 6L6gcs..I have tried others in the leak SI-50 which takes EL34/kT66s/5881s and 6L6gcs of course and in the last three just stomp the EL34s into the dirt.
      If the power supply waveform isn't pretty,neither is the sound in most cases.
      
      

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