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• RE: What would cause filament to burn out on My 300B tubes - JayD 14:27:50 07/15/22 (2)
  In Reply to: RE: What would cause filament to burn out on My 300B tubes posted by Paul Joppa on July 14, 2022 at 21:01:22

  Don't have the circuit diagram handy but it is a Welborne DRD (direct reactance drive) based on Jack Elliano schematic.
  

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  • RE: What would cause filament to burn out on My 300B tubes - Paul Joppa 17:18:33 07/15/22 (1)
    In Reply to: RE: What would cause filament to burn out on My 300B tubes posted by JayD on July 15, 2022 at 14:27:50

    Google turned up the kit manual, which shows a 6.3v winding into a rectifier bridge and CLC filter. Hard to see any way for that to produce more than a normal voltage unless maybe the filament choke is shorted. If your power line voltage is high, you might see a small increase in voltage.
    
    It's probably worthwhile to measure the filament voltage on both monoblocs.
    

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    • RE: What would cause filament to burn out on My 300B tubes - JayD 10:25:11 07/17/22 (0)
      In Reply to: RE: What would cause filament to burn out on My 300B tubes posted by Paul Joppa on July 15, 2022 at 17:18:33

      Thanks for the input
      

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