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Genz-Benz GBE500H tube replacement?

Discussion in 'Amps and Cabs [BG]' started by Dkerwood, Jun 7, 2017.

  1. Dkerwood


    Aug 5, 2005
    Hey, guys, my bass player just picked up a used GBE500H and SWR Henry the 8x8 cab for his stage rig. We think that the tube in the preamp might be shot, but the user's manual doesn't say anything about how to replace it. Any resources you guys have found on this? Thanks in advance!
  2. Unless I'm missing something...
    Pull out old tube. Push in new one?
    The pins should be keyed so it only goes in one way.
  3. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Why does he think it's "shot"? The tube should easily last 20+ years unless it happens to be defective. Wearing out is unlikely.
    wave rider and Old Garage-Bander like this.
  4. It's like picture tubes in old TV's.
    Everyone always though every problem meant needing a new picture tube.
    It's the only part in a TV they knew about.
  5. Primary

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