Okay to use 1 6V6 GT and 1 6V6 GTA in my Clark Beaufort Tweed Deluxe?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by SonexReducer, Apr 24, 2015.

  1. SonexReducer

    SonexReducer Member

    Messages:
    366
    Joined:
    May 18, 2013
    Would it be okay to use a 6V6 GT and a 6V6 GTA in my Clark Beaufort Special Tweed Deluxe?

    Thanks.
     
  2. The Dirty Tube

    The Dirty Tube Member

    Messages:
    1,639
    Joined:
    Aug 14, 2012
    Location:
    A Child's Garden of Glass
    Yep.

    The GTA is technically slightly up-rated, but the operations and functionality are identical to standard 6V6 tubes and it's perfectly fine to mix and match GT and GTA tubes as needed.

    What's more important is that the tubes are fairly matched for conductance, but this applies to all power tube applications.
     
  3. SonexReducer

    SonexReducer Member

    Messages:
    366
    Joined:
    May 18, 2013
    Thanks Dirty,

    I just tested the tube, and with the gta and gt, it's got more of a "snappy" sound, but i'm sure it has to do with it being a different tube and not the gta thing. Anyways, I like it.

    Whats the deal with these old hammond tubes, seem to sound pretty good to me.
     
  4. drbob1

    drbob1 Silver Supporting Member

    Messages:
    22,143
    Joined:
    Aug 9, 2004
    Most Hammond tubes weren't pushed very hard, so used test pretty good and sound pretty good.
     
  5. SonexReducer

    SonexReducer Member

    Messages:
    366
    Joined:
    May 18, 2013
    Thanks Dr Bob.

    Your friend...
     
  6. jcs

    jcs Member

    Messages:
    7,473
    Joined:
    Sep 15, 2002
    Location:
    on a hill
    Matched somewhat close for current draw is at least or more important than mutual conductance.......

    ALWAYS check current draw at idle.
     
  7. drbob1

    drbob1 Silver Supporting Member

    Messages:
    22,143
    Joined:
    Aug 9, 2004
    I'd argue that I can live without matching for current draw, while I might get more hum, I also tend to get nice, second order harmonics. What I can't live with is a tube red-plating, and with new tubes the only way to prevent that is to test the bias at idle in your amp. Get some kind of bias testing system and check to see how much you're dissipating! I'm using the Weber Bias Rite, which is a pretty good solution with the voltage option.
     

Share This Page