Adding a pilot light (power light) to a amp running off of line power?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by samdjr74, Feb 17, 2006.

  1. samdjr74

    samdjr74 Supporting Member

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    Hi All,
    I'm almost done with my amp project and I want to add a pilot light to the top of the chassis but when I tried to do this the lamp would come on but the amp didn't have enough power to run. As soon as I took the light out of the loop the amp worked fine. I don't need the light but I figured it would be a nice addition. I took the main lead coming from the power switch cut it and put the light right passed the switch. Am I doing something wrong or is this impossible to do, the amp is a 1957 LECTROLAB R200B.
    Thanks,
    Sam
     
  2. Dave C

    Dave C Gold Supporting Member

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    Sounds like you put the lamp in series which won't work very well, put it in parallel. Better yet get a low voltage fixture that uses a #47 bulb and tie to the 6.3 volt heater circuit.
    Dave C
     
  3. samdjr74

    samdjr74 Supporting Member

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    Hi Dave,

    Thanks for the info, I'll try to parallel and see what happens.

    Thanks,
    Sam
     
  4. VintageJon

    VintageJon Member

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    Sam- is this a 35W4/50C5/12AU6 tube compliment?
    If so, it's a series-filament unit and a CM47 won't work!

    You could probably get away with a neon pilot lamp...

    In addition it likely doesn't have a power transformer so you REALLY need to install an isolation transformer in it.

    Be Careful,
    Jon
     
  5. samdjr74

    samdjr74 Supporting Member

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    Hi Jon,

    The tube arrangment is 50L6, 35Z5 and two 12BF6's. I think the problem is I wired the lamp in series not parallel. It does hav an isolation transformer along with an output transfomer and the bulb is a neon 120VAC.

    Thanks,
    Sam
     
  6. VintageJon

    VintageJon Member

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    Sam, You're OK then, wire it in parallel.

    May The Tone Be With You,
    Jon
     
  7. samdjr74

    samdjr74 Supporting Member

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