'62 Fender Concert Help

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by slider313, May 13, 2006.


  1. slider313

    slider313 Silver Supporting Member

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    I'm restoring an early '62 Fender Concert and need to totem pole 2/100uf@350v w/220k 1 watt resistors in place of the original 20@600v caps.Anyone with a diagram on placement and does the ground on the first cap just get moved to the second ground eyelet? Also, can anyone recommend someone in the NY,NJ,CT, area to recover the cabinet? Thanks.
     
  2. slider313

    slider313 Silver Supporting Member

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    Any help would be appreciated.
     
  3. brad347

    brad347 Member

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    recovering in brown tolex is hard. The currently available materials are a bad match color and pattern-wise. This guy does good work though his wait time is long...

    http://www.vintage-amp.com/

    Don't know about the caps.

    I have a super from '61, nothing beats the brown fender phase-shifting tremolo/vibrato. Good luck on the amp.
     
  4. tonezoneonline

    tonezoneonline Member

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    I don't know what you mean by"totem pole".Series to obtain a higher voltage?
    I've worked on several Brown Concerts and used 20@500VDC Atoms without any problems.They are readily available and fit fine.
     
  5. brad347

    brad347 Member

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    totem pole I believe means 2 caps in series with a 220k resistor across... doubles voltage but halves capacitance.
     
  6. slider313

    slider313 Silver Supporting Member

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    The totem pole means series with two 220k resistors. The 20's @ 500v will fit fine, but it's real close on the voltage. A set of Phillips 6L6WgB's are the hottest tubes I have and they;re running 31ma and 485v on the plates. When switching from standby to play I'm sure it's over 500v for a few seconds. Not good for a 500v cap.
     
  7. maxwedge

    maxwedge Member

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    Like this>>>
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    Negitive wire to the 1st cap and positive to the 2nd. The 220k resisters are under the caps. Tie the + and - together at the back side.
    This is when I was recapping my 61 Bandmaster.:)
     
  8. tonezoneonline

    tonezoneonline Member

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    Two caps in series doubles the voltage and halves the capacitance.The 220k resistors are bleed resistors and have nothing to do with it.When speaking electronics why can't we use electronics language?
    Not trying to be a dick just a peeve of mine.There is enough confusion on the internet.I have a Brown Concert here that came from the factory with 6 - 20uf@500VDC caps and 1- 30uf@500VDC cap on the filter board.They made it 40 some years OK but you are correct.It's close.
     
  9. donnyjaguar

    donnyjaguar Member

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    I've seen amplifiers that use the 5U4 rectifier wantonly exceed capacitor and plate voltage maxima for a second or more during warm up.
     
  10. slider313

    slider313 Silver Supporting Member

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    Thanks Maxwedge and everyone else for their help.
     
  11. Mr. dB

    Mr. dB Member

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    The 220K resistors are a voltage divider, to ensure that the voltage drop across each series cap is the same.
     

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