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Oliver B120 mystery.

Discussion in 'Amps and Cabs [BG]' started by firebottles, Jun 11, 2007.

  1. firebottles


    Jun 11, 2007
    Hello All,

    I'm curious about the metal cylinder (about the size of a 6L6) protruding from my B120's chassis. Is this a rectifier? If so, what type of tubes do these beasts use for rectification?

    Or perhaps...this metal cylinder is NOT a sheath for a vacuum tube...

    Can anybody advise?

  2. svtb15

    svtb15 Inactive

    Mar 22, 2004
    Austin,TX - McKinney,TX - NY,NY, - Nashville,TN
    I play it all. Whatever works for the gig. Q+
    I am going to ttake astab in the dark since i have not seen one of those in years.. but i believe it is a capcitor.. for the power supply filter
  3. LarryR


    Feb 2, 2003
    Los Angeles

    If you're talking about Jess Oliver's design, ask him directly at


    I own one of his heads. Very Ampeg'ish. I like it.
  4. Wesley R

    Wesley R Gold Supporting Member

    is my avatar for a reason. His designs have provided me with decades of enjoyment and income.

    Best of Luck,
    Wesley R.
  5. i'm sure it's a multi-stage filter capacitor.

    it's a few electrolytic capacitors built into a metal container used in the power supply to filter out hum.
  6. firebottles


    Jun 11, 2007
    Ahhh...gotcha. Thank you all for your information!
  7. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

    Jan 16, 2021

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