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DSL5c - The Ultimate Lo-Power Amp

Discussion in 'Marshall Amps' started by Micky, Dec 9, 2013.

  1. wiibur

    wiibur New Member

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    Mitchell Pearrow likes this.
  2. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

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    :cheers:
    :welcome:
    To the forum
    Sorry I am of no help here with your question, but be patient others here should be able to help you.


    Mitch
     
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  3. Tubemaniac

    Tubemaniac New Member

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    who knows where i can find BIAS calculator or tables for 12BH7 please? thank you!
     
  4. fitz288

    fitz288 Well-Known Yinzer Silver Supporting Member

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  5. Tubemaniac

    Tubemaniac New Member

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    Thank you!
     
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  6. Tubemaniac

    Tubemaniac New Member

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    All right, i won't kill myself as i have a bit of experience messing around with electrics, but never tried to adjust the tube amp bias myself. I saw the videos with DSL40C and the guy was connecting the black lead from the multimeter to the middle of the bias testing point and the red to each of the sides to test each power tube.

    In case of DSL5C there's still 3 pins on the bias test point but only one power tube. So I guess i still connect the black lead to the middle and then the red one to which side?
    And if i want to read the voltage of the tube then i connect the black lead to ground (chassis) and the red one to the 3rd pin? Where do you count the 3rd pin from? Most sources say its clockwise but depending on the tube i saw some people saying it can be anti clockwise? Definitely not enough info on 12bh7. Is it this one?? Thank you very much in advance for your help!
     

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  7. Micky

    Micky Well-Known Member VIP Member

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    Both outer test pins are tied together, so connect to either one to measure bias.

    Use your meter to find pin 3. It will read over 400VDC.
     
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  8. Tubemaniac

    Tubemaniac New Member

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    Thank you very much!
    Loved the amp stock, love it even more now with a Celestion G12h30 Anniversary, and love the amount of useful info in this thread.
    Time to roll some tubes now
     
  9. Micky

    Micky Well-Known Member VIP Member

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    I have rolled a lot of tubes thru my 5c, but in the end as far as tubes go, I left it pretty much stock. I do like a Ruby hi-gain in V1, but that coupled with a Vet-30 (12") and I am very happy. It is incredibly loud for indoor use, and as of late I use it as a power amp feeding it with my '57 Fender Champ. The Champ sits right on top of the 5c, and it is the perfect platform for testing everything from pedals to pickups.

    OH - remember that the bias numbers are multiplied by 10...
     
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