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    Tube Cage with Tall Tubes

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    bigmm79

    Posts : 23
    Join date : 2010-09-15

    Tube Cage with Tall Tubes

    Post by bigmm79 on Sun Oct 10, 2010 9:32 pm

    I've seen some discussion here regarding the ability to use a tube cage with a tall GZ33 rectifier but I've never seen a conclusion as to whether it will fit or not. Can somebody with a tube cage measure the clearance? Looks like the GZ33 is about 5" base to top. Thanks!

    Sal

    Posts : 223
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    Re: Tube Cage with Tall Tubes

    Post by Sal on Mon Oct 11, 2010 2:53 pm

    I'll check tonight when I get home from work. Are we talking about the ST-70?

    Sal

    bigmm79

    Posts : 23
    Join date : 2010-09-15

    Re: Tube Cage with Tall Tubes

    Post by bigmm79 on Mon Oct 11, 2010 3:18 pm

    Thanks Sal. Yes ST70.

    Bob Latino
    Admin

    Posts : 2374
    Join date : 2008-11-26
    Location : Massachusetts

    Re: Tube Cage with Tall Tubes

    Post by Bob Latino on Tue Oct 12, 2010 6:12 pm

    Hi,

    That Mullard GZ33 won't fit under the tube cage. If you run an ST-70 with the taller GZ33 (CV5745) then you will have to play the amp with the cage off ..

    Bob

    baddog1946

    Posts : 304
    Join date : 2010-02-03
    Location : Costa Rica

    Re: Tube Cage with Tall Tubes

    Post by baddog1946 on Tue Oct 12, 2010 7:06 pm

    Hi:
    Those KT-120's also measure out to be right at 12 cm. (5")tall.
    Baddog1946

    Bob Latino
    Admin

    Posts : 2374
    Join date : 2008-11-26
    Location : Massachusetts

    Re: Tube Cage with Tall Tubes

    Post by Bob Latino on Tue Oct 12, 2010 7:17 pm

    baddog1946 wrote:Hi:
    Those KT-120's also measure out to be right at 12 cm. (5")tall.
    Baddog1946

    Hi Baddog,

    You know, I just measured a KT120 and it measured out at about 4 5/8" tall. A KT120 will probably fit under the cage although I have not tried it ? When that cage is all the way down you have *about* 4 3/4 - 4 7/8 inches of clearance under the cage. The GZ33 definitely won't fit under there but I think a Tung-Sol KT120 will.

    If anyone is running a KT120 Tung-Sol (which is a pretty tall tube also) on an ST-120 let me know if it will fit under the cage? I *think* it will. If I have time tomorrow I will try a KT120 under the tube cage and double check that the cage doesn't bang on to the top of the the KT120.

    Bob

    baddog1946

    Posts : 304
    Join date : 2010-02-03
    Location : Costa Rica

    Re: Tube Cage with Tall Tubes

    Post by baddog1946 on Tue Oct 12, 2010 9:29 pm

    Hi Bob:
    I just tried it and it seems like it does actually fit with a thin hair to spare (I would say about 1/8" on my amp) but IMHO it is still too close for comfort.
    The metal of the cage could act like a heat sink to overheat the tube with such close proximity Those 120's throw a lot of heat.
    I will not use the cover when they are in use. Better safe than sorry.
    Baddog1946

    Sal

    Posts : 223
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    Re: Tube Cage with Tall Tubes

    Post by Sal on Thu Oct 14, 2010 10:22 pm

    I must apologize, I totally forgot about measuring the height of the cage, on a ST-70 the maximum internal height you have is 4 1/2 inches as the octal tube socket is raised a little on the chassis.

    Sal

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