What's your favorite phase inverter 12AX7 tube and why?

Discussion in 'Amps and Cabs' started by clay49, Dec 31, 2011.

  1. clay49

    clay49 Silver Supporting Member

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    List the amp and power section of the amp, and tell us what PI you use, and what effect that tube gives to your sound....
     
  2. Joe Porto

    Joe Porto Member

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    One with matched triodes. Much more important than brand IMO. Gain factor is important too. Find a dealer that matches and rates gain level of each triode.
     
  3. clay49

    clay49 Silver Supporting Member

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    next....
     
  4. Norjef

    Norjef Member

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    I keep hearing that long plates make the best PIs.
    Anyone use JJ803, Yugo, LPS, current schtuff?

    Oh yeah, Happy New Year too !!!

    PS - MANY self-appointed and real tube-gurus "say" matched PIs are "snake-oil" as too much of related circuits and components are not matched anywhoooo.
    me ? - "I Know Nutting !!" (Schultz)
     
    Last edited: Dec 31, 2011
  5. falconer

    falconer Member

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  6. HandOfTheHost

    HandOfTheHost Member

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    I've tried 12ax7's in the pi position and ended up going back to a lower gain 12au7, less noise and tighter sounding overall.
     
  7. clay49

    clay49 Silver Supporting Member

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    Really...12AU7...that's a lot lower. I've got an old 50's Sylvania 12AU7 that I'll have to chunk into my Soldano and see what it does....
     
  8. sublimeaudio

    sublimeaudio Silver Supporting Member

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    I've had excellent results with the Sovtek 12AX7LPS. I'm not usually a big fan of Sovtek tubes, but this one is great.
     
  9. AD_

    AD_ Member

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    I recently went through all my tubes trying to find which combination of gain stage and phase inverter tubes sounded the best to me. I have a tone king metropolitan, and the guitars I have make me try to find something that goes well with their tone. I don't want to say I need a 'subdued' top end, maybe not as detailed. I like the sound of a Mullard in v1, but it is very detailed. If I have a very detailed tube in the phase inverter, it tends to be way too bright and ice-picky. I have a RCA long/black plate 12ax7 in the PI slot now, and it seems to be a happy medium between too detailed and too dark. The phase inverter tube plays a huge part in how this tone king sounds. Another mullard in the PI is the worst, to me. Tungsrams, which are very detailed, are also bad sounding with a detailed v1. Raytheon long/black plates sound very punchy and strong, but not quite what I was looking for. A Raytheon/Amperex 12ax7 in the phase inverter sounds a bit dark, but could work if I didn't like the RCA better.
     
  10. elsicodelico

    elsicodelico Member

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    I have a, Laney gh-50, JJ kt77 power tubes with a sovtek 12ax7 lps in the p.i.
    Works for me
     
  11. Onioner

    Onioner Member

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    Depends on the amp, but one thing i've learned is that matched triodes not only isn't necessary, it may be outright undesirable.
     
  12. neville5000

    neville5000 Supporting Member

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    After listening to multiple NOS and new production tubes this is the one I settled on. The Tung Sol RI is good in the PI slot also. FWIW I run NOS in every other position, but my ears can't detect a big enough change to cause me to switch.
     
  13. riffmeister

    riffmeister Gold Supporting Member

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    whatever sounds good with the rest of the amp. :)

    usually a Philips 12AT7......
     
  14. Coldacre

    Coldacre Member

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    I like GE for NOS or Gold Lion current for PI
     
  15. Joegalaxy

    Joegalaxy Member

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    I spent some time trying out different ones in my Roccaforte C30 and ended up with a smooth long plate Telefunken in the PI. That's with Bugle Boys in the V1 and V2. It's all about trial and error with your particular amp.
     
  16. aynirar27

    aynirar27 supports his member with silver Silver Supporting Member

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    any luck with a EH in the phase inverter? full sounding tubes and IMO the very opposite of detailed. They do seem to go bad awful quickly though. I had a good sound going in a Roccaforte 50 watt I had. It had a real ripping top end and a mullard in V1 and EH in the PI smoothed it out a bit.
     
  17. ChorusCrackpot

    ChorusCrackpot Member

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    What phase inverter valves would you recommend for older Marshall JCM 800s, particularly the single channel 50 watt versions?
     
  18. riff1006

    riff1006 Supporting Member

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    Mullard CV4024 in both my SF Fenders.
     
  19. HandOfTheHost

    HandOfTheHost Member

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    Actually I misspoke, I'd tried a few different tubes in the pi slot and went back to the original 12at7.
     
  20. clay49

    clay49 Silver Supporting Member

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    Guys, this is turning into a very informative and helpful thread...thanks for the varied responses...keep 'em coming!
     

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