Ever seen a Mullard GZ34 without a hole in the key?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by conundrum, Jul 31, 2008.

  1. conundrum

    conundrum Member

    Messages:
    695
    Joined:
    Sep 5, 2005
    :confused:
    I've got a GZ34 with barely visible factory code of X31 B9D, but there is no hole in the guide pin, and the font dosen't look like the usual Philips font. Plates look like metal base GZ34's.
    Any expert opinions?
     
  2. V846

    V846 Member

    Messages:
    322
    Joined:
    Dec 22, 2003
    Location:
    Enfield, CT
    early Mullard GZ don't necessarily have the hole in the pin, got a picture and how many if any serrations in the plates and does it have a fat base ?
    I forgot to ask does it have "double D" getters? one thing threw me is the X31, sure that isn't f31
     
    Last edited: Jul 31, 2008
  3. nitehawk55

    nitehawk55 Member

    Messages:
    2,815
    Joined:
    Jun 13, 2007
    That's a 1959 built in Brussels Belgium by Philips who owned Mullard . The X or L code ( L= Sittard Holland ) did not have holes in the centering pin and the plates did not have notches like the ones built at the Blackburn British plant which began around 1960-61 ?
    Nothing wrong with the X and L GZ34 and in my opinion are probably as good or even better . X code would likely have the same build as the early metal base which were made from 1954 to 57 and the plastic base began in 1958 .
    If any of my info is wrong please correct me :)
     
  4. conundrum

    conundrum Member

    Messages:
    695
    Joined:
    Sep 5, 2005
    Sorry about that, yes F31 instead of X. Got EL34's on my mind obviously.
    No serrations, double halo getters.
     
    Last edited: Jul 31, 2008
  5. conundrum

    conundrum Member

    Messages:
    695
    Joined:
    Sep 5, 2005
    Well, I'm not infalliable on the topic, but I believe the codes mean,

    Blackburn factory, 1959, April
     
  6. nitehawk55

    nitehawk55 Member

    Messages:
    2,815
    Joined:
    Jun 13, 2007

    Whoops....:jo
    You're right , I put the X in the wrong place . Early Blackburn was in around 58-59 . Won't have the hole in the pin but should have 4 notches in the plates and the fat base .
     

Share This Page