7591 7868 are these tubes similar ??

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by ES330, Apr 2, 2005.


  1. ES330

    ES330 Supporting Member

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    7591 7868 are these tubes similar ??
     
  2. Blue Strat

    Blue Strat Member

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    Yes to 7591 = Octal, but the 7868 is larger than an EL84 (same diameter as an octal tube) but with a 9 pin base.
     
  3. 57special

    57special Member

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    Yes, but he asked about 7591's, not 7581's. I DO know that they were both used in the same models of certain 60's Ampeg. i.e. a Reverborocket or SB12 Portaflex. I think the pin outs are different, and that the 7591 is a more robust tube (can deliver more power when maxed out) than a 7868.
     
  4. Blue Strat

    Blue Strat Member

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    7581 was a typo on Tele's and my part. We both meant 7591 and the information stands as stated.
     

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