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Yaesu FL-2100b with slight hum

Discussion in 'Amateur Radio Amplifiers' started by W4MJR, Jan 22, 2019.

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  1. N8FVJ

    N8FVJ Ham Member QRZ Page

    I have isolated transformers using rubber washers in-between the transformer and chassis. I assume the transformer laminations are tight. I have also tightened up the transformer screws on transformers with loose laminations and applied some lacquer to the laminations after tightening.
     
  2. F8BDX

    F8BDX Ham Member QRZ Page

    Hello
    me too the Transformer vibrates.
    I will look at this
     
  3. G3YRO

    G3YRO Ham Member QRZ Page

    Never had this hum vibration problem myself . . . but I would try tightening the bolts that go through the transformer.

    Also - I would not recommend modifying the bias circuit - the circuit in this amp never goes wrong . . . whereas the modified circuit used in the FL2100Z version fails all the time !

    Same goes for the Relay - it goes on forever . . . and not a problem unless you want to work break-in CW. And also don't change the anode stoppers.

    Roger G3YRO
     
  4. F8BDX

    F8BDX Ham Member QRZ Page

    the FL-2100 is ok.
    the problem was mechanical (fan)
    and the screws of the Transformer.
    73
     
  5. F8BDX

    F8BDX Ham Member QRZ Page

    73 Roger
    Jose
     

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