Tubes Asylum

• There aren't any obvious 9-pin substitutes - andy evans 03:03:08 04/05/24 (2)
  In Reply to: RE: Type 37 and type 76 posted by 6bq5 on April 03, 2024 at 16:11:45

  The 9 pin tubes came in at the same time as feedback in PP amps and so tended to be higher gain, like 20 or more. Not suitable for a low gain low Rp triode for a line stage. Same with the octals, except for 6P5GT with a gain of 14 like the 76. Plus 6AH4 and 1626. So there's just the pentodes/tetrodes in triode like the 6V6, 6F6, 6G6.
  
  Early tubes are just fine with me. Some of the best ever made.
  

  ---

  • RE: There aren't any obvious 9-pin substitutes - 6bq5 10:50:10 04/05/24 (1)
    In Reply to: RE: There aren't any obvious 9-pin substitutes posted by andy evans on April 05, 2024 at 03:03:08

    I may have miss-typed -
    I did not mean to imply that 9 pins are better, or could substitute for your type 37 or 76 tubes-
    Merely trying to say that there were not as many makers of fire bottles that made 37s and 76s, or 26s etc. as there were/are for the 12AX7, or 6550 types-
    
    There is an aspect of some of the older tubes were made with more attention to detail, and for shorter production runs on given forms, so the constancy of early runs to later runs is higher than that of the tooling that moved from one factory to another and continued to run well after the original maker would have re-built the tooling.
    Happy Listening
    
    

    ---

    • Ah - thanks! (nt) - andy evans 16:22:15 04/05/24 (0)
      In Reply to: RE: There aren't any obvious 9-pin substitutes posted by 6bq5 on April 05, 2024 at 10:50:10

      .
      
      

      ---

Post a Followup:

This post is made possible by the generous support of people like you and our sponsors:

Kimber Kable

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---