Tubes Asylum

• Re: What to replace 7189 tubes with? - Laudanum 13:02:08 01/26/04 (7)
  In Reply to: What to replace 7189 tubes with? posted by HiFiBuff on January 26, 2004 at 11:46:11:

  You may get different recommendations from different sources but the only "true" 7189 replacement in current/recent production is the Sovtek EL84M or Russian equivalent 6n14n-eb or ev (with the "n" actuallly being a pi sign). BUT .... The JJ EL84, regular Sovtek EL84 and the Ei EL84 are all said to work fine although life will be limited compared to the NOS 7189's. My Scott tech has informed me that all 3 of the above regular EL84's work fine and I believe that Ned of Triode Electronics also states the same on his website.
  
  

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  • Re: What to replace 7189 tubes with? - Timbo in Oz 13:31:18 01/26/04 (3)
    In Reply to: Re: What to replace 7189 tubes with? posted by Laudanum on January 26, 2004 at 13:02:08:

    IME and IMO the Sovtek M's are worth it.

    they sound fine, and I'm quite picky.

    Tim
    Timbo in Oz
    The Skyptical Mensurer and Audio Scrounger
    Peace
    
    

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    • Re: What to replace 7189 tubes with? - jeanluc.b@tele2.fr 21:08:35 01/30/04 (0)
      In Reply to: Re: What to replace 7189 tubes with? posted by Timbo in Oz on January 26, 2004 at 13:31:18:

      7320 or E84L RTC FRANCE last product upgrade all EL84 or 7189 made before...see datasheets....hard to find but if.....
      
      

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    • Re: What to replace 7189 tubes with? - steven oda 07:58:18 01/27/04 (1)
      In Reply to: Re: What to replace 7189 tubes with? posted by Timbo in Oz on January 26, 2004 at 13:31:18:

      HFB,

      Try the 1970's Reflector-made (not Sovtek labeled) 6pi14pi-EB. "EB" makes this tube mil spec. Tough, lasts long, and has pretty nice aggressive tone.

      Nice price, too.
      
      

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      • Re: What to replace 7189 tubes with? - HiFiBuff 08:20:21 01/27/04 (0)
        In Reply to: Re: What to replace 7189 tubes with? posted by steven oda on January 27, 2004 at 07:58:18:

        Yeah, Sounds like the 6pi14pi-eb is the way to go.
        Thanks,
        -Dave
        
        

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  • Re: What to replace 7189 tubes with? - Jimmy 13:30:28 01/26/04 (2)
    In Reply to: Re: What to replace 7189 tubes with? posted by Laudanum on January 26, 2004 at 13:02:08:

    I experienced success with EI Gold Elite EL84 in a Fisher SA-100 providing 410 volts on the plate. Bias was set at -13.5 volts. These tubes sound good for new stock.
    
    

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    • 410 volts B+?? Re: What to replace 7189 tubes with? - wlee 17:49:49 01/26/04 (1)
      In Reply to: Re: What to replace 7189 tubes with? posted by Jimmy on January 26, 2004 at 13:30:28:

      How long will the tube life last, this is fixed bias so it must be almost full 410 v cathode to anode...? I have a pair of Beard M70 that used 360 volts and tube will probably last only 1 yr. I am thinking of adding a choke to extend tube life/reduce B+....
      
      

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      • Re: 410 volts B+?? Re: What to replace 7189 tubes with? - Jimmy 20:28:53 01/26/04 (0)
        In Reply to: 410 volts B+?? Re: What to replace 7189 tubes with? posted by wlee on January 26, 2004 at 17:49:49:

        The voltage is definately high. Tube life also depends upon the plate current. The -13.5 volts is higher bias than the standard -11 volts at 300 volts plate. I did not own the SA-100 long enough to know the tube life. The amp was originally bias at -10 volts or way too 'hot' for long tube life.
        
        

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