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LA-2A Tubes

Discussion in 'Pro Audio Equipment' started by audiokid, Sep 13, 2012.

  1. audiokid

    audiokid Chris Staff Resource Member

    Mar 20, 2000
    Prince George, BC
    Home Page:
    I have two band new UA LA-2A . As an expensive whim, I bought two sets of GE LP 12AX7 pair + RCA 12BH7 , that were new and matched. I switched the stock tubes out for these.

    Was there a difference?
    I used a Neumann M 149 into an SPL Premium mic pre ( RACK PACK) series (to die for) which conveniently has two outputs (image) same source split (a killer parallel setup) . I was able to do a good comparison accurately between one LA2A with stock tubes and one LA2A with the GE LP.

    At first I felt the stock tubes sounded close. After a few minutes zoning in on things, I started hearing how these tubes have a silkier high with a more pleasing mid and fuller lows.
    The stock LA2A sounded just a bit edgy compared. Not quite as hifi.
    Don't get me wrong though, if I hadn't switched these out, I'd still be in love and should and when these new tubes die, both my stocks LA2A's are to die for. I have backups tubes now but oo la la... these new tubes are staying!

    Comparing both LA-2A's after both sets installed, sound so close I trust they were matched very well. Thank you Christian from ProAudioTubes. You were extremely helpful and very interesting! I will be calling you for more tubes.

    I'm happy to report, tubes do make a difference and these GE long-plate 12AX7 on the output with the RCA 12BH7 sound great! They are also very quiet and not even broken in.

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