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Discussion in 'Amateur Radio Amplifiers' started by WA4ALA, Sep 14, 2015.

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  1. WA4ALA

    WA4ALA Premium Subscriber QRZ Page

    I hate to keep bothering this forum with questions concerning my ongoing efforts on the 2100B but I have nowhere else to go, having googled and checked all available documentation concerning how to replace a burned out pilot light for the operation switch on my 2100B.

    I can see that the light is housed in the switch but that is the extent of my information concerning this problem and I am reluctant to start taking this unit apart without a bit more information concerning the how and why of bulb replacement.

    Any and all help will be gratefully appreciated,


    Michael - WA4ALA
  2. W9GB

    W9GB Ham Member QRZ Page

    Fox-Tango is the base for Yaesu information, such as Yaesu "FL" amplifiers: Amplifier Evolution.htm

    That pilot light scheme was used by Yaesu-Musen back in 1960s.

    Front cover removed.

    Yaesu FL-2100B --- TURN to Page 15 (Parts List)

    The Incadescent Lamps (PL, Pilot Lamp) are PL1 and PL2 : 14 Volts, 30 mA
    Bulb Size? Likely T-1 (3mm)

    Alltronics LP-23 is a T-1 bulb


    Last edited: Sep 14, 2015
  3. WA4ALA

    WA4ALA Premium Subscriber QRZ Page

    Many thanks for all your help.
  4. G3YRO

    G3YRO Ham Member QRZ Page

    You can just use an ordinary 12V miniature bayonet bulb as used in cars - any motor accessory shop should have one (all car bulbs are designed to work at 14V)
  5. VE7GPG

    VE7GPG Ham Member QRZ Page

    A diode, a resistor, and a 12V led works just fine and won't burn out again
  6. G3YRO

    G3YRO Ham Member QRZ Page

    It's YEARS since I've worked on an FL2100 . . . but I'm pretty sure you can just replace the bulb from underneath (ie you don't have to take the front panel off or anything)

    Yes but a bulb plugs straight in and will last another 30 years!

    (Must confess I HATE LEDs used in cars for lighting!)
  7. VE7GPG

    VE7GPG Ham Member QRZ Page

    True - but finding the correct size to fit the holder may be a problem - either way it's a quick fix !!
  8. K7DNA

    K7DNA Ham Member QRZ Page

    Late reply but might be useful. I've replaced the lamps in my FL-2100B with these Eiko #7646 bulbs. Same specs & size. Tinned the leads and used small shrink tubing. Works FB.
    Steve k7dna

    Attached Files:

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