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Thread: 5879 preamp tube

  1. #1
    Junior Member
    Join Date
    Nov 2008

    5879 preamp tube

    I realize this tube is a pentode, if memory serves me correctly, so does that mean other pentode-type preamp tubes will work as substitutes? I just bought about 2,500 NOS tubes of various types, but unfortunately there were no 5879s there. I did manage to get a bunch of classic 12AX7s, 12AT7s and 12AU7s, but nothing of the 5879 variety.

    I have a filmosound amplifier that takes a 5879. What are some examples of acceptable substitutes? Any help is much appreciated. Thanks!

  2. #2
    Join Date
    Sep 2006
    This site lists the EF86 as similar but not identical. It may be necessary to make some changes to the socket or even the components surrounding the tube:

  3. #3
    Old Timer
    Join Date
    May 2006
    Cornelius, Oregon
    It is 5879 or bust, unless you want to change the socket and the circuit around it to voice it for another tube. The EF86 has a lot more gain than the 5879 and is more imcrophonic. There are tons of great quality NOS 5879's around for good prices still.


  4. #4
    Lifetime Member Enzo's Avatar
    Join Date
    May 2006
    Lansing, Michigan, USA
    AES has them for $8-9 each

  5. #5
    Junior Member
    Join Date
    Nov 2008
    I know they're out there, and what I'll most likely do is stock up on them, but I'm left to wonder why they wouldn't have used a triode like anything in the 12AX7/12AT7/12AU7 family instead of the 5879. I don't hear anything more special about the 5879 than the 12AX7 or any of its other similar family of tubes.

  6. #6
    Senior Member Regis's Avatar
    Join Date
    May 2006
    My Kay 720 uses 5879's, every one I've tried has been microphonic as hell.

  7. #7
    Senior Member
    Join Date
    Dec 2007
    I've got 5 NOS 5879 tubes in front of me. Two RCA and three GE. Would you care to trade? I'm looking for NOS 12AY7 tubes.

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