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1979 Bandmaster Reverb question

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by johnnyguitar, Sep 3, 2005.

  1. Sep 3, 2005 #1
    johnnyguitar

    johnnyguitar Long in the tooth Silver Supporting Member

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    My 1979 Bandmaster Reverb has 2 adjustments in the back one is hum balance and the other is output tubes matching...can someone explain these to me..and there is no internal pot to bias amp could one of these be this bias adjustment??..thanks in advance
     
    johnnyguitar, Sep 3, 2005
    johnnyguitar, Sep 3, 2005
    #1
  2. Sep 4, 2005 #2
    loverocker

    loverocker Member

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    I think I remember reading that there the bias adjustment was one of the differences in the blackface-silverface development. If so, you can find details on changing it on any of the online Vibroclone guides (how to convert a sf BMR to a bf VibroVerb).
     
    loverocker, Sep 4, 2005
    loverocker, Sep 4, 2005
    #2
  3. Sep 20, 2005 #3
    Jef

    Jef Member

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    The BMR's with those controls are probably the late 70s ultralinear 70 watt versions. They are not easily blackfaced because of the different power supply (SS rectifier, higher voltages) and UL output section.

    Those amps are pretty good amps in their own right. They're not going to sound as organic as a BF or early SF, but if you like a tight, responsive, loud and clean tube amp, they're the ticket.

    Jef
     
    Jef, Sep 20, 2005
    Jef, Sep 20, 2005
    #3
  4. Sep 20, 2005 #4
    Blue Strat

    Blue Strat Member

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    The balance pot can be rewired to be a "true bias" pot by a tech. This is highly recommended.

    All you'll need then is a bias probe similar to a Bias Rite www.webervst.com and you'll be all set. No scopes or signal generators required.
     
    Blue Strat, Sep 20, 2005
    Blue Strat, Sep 20, 2005
    #4

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