Yaesu FL-2100f problem

Discussion in 'Amateur Radio Amplifiers' started by KB0UOA, Jun 27, 2015.

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  1. KB0UOA

    KB0UOA XML Subscriber QRZ Page

    Im having a problem with my fl-2100f. The tubes are in transmit mode all the time. They get hot real fast. The amp goes into standby except for the tubes. An ideas?
     
  2. WW3QB

    WW3QB Ham Member QRZ Page

    Are you saying there is constant plate current? If yes, the bias may need adjusting. Are Svetlana brand 572B tubes installed?
     
    Last edited: Jun 27, 2015
  3. KB0UOA

    KB0UOA XML Subscriber QRZ Page

    Yes, It has constant plate current. It has [FONT=arial, sans-serif]Centurion tubes. Is there a adjustment for bias?or just different resistors?[/FONT]
     
  4. WW3QB

    WW3QB Ham Member QRZ Page

    I assume you mean Cetron tubes. There is a large variable resistor (it is not a potentiometer) on the underside. But I fear you may have a bias circuit problem.
    Edit: Looking at the schematic the most likely failure is the bias electrolytic capacitor.
     
    Last edited: Jun 27, 2015
  5. KB0UOA

    KB0UOA XML Subscriber QRZ Page

    Ok, Thanks
     
  6. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    Or the relay contacts that place the resistor in line on standby and short it out for operating.
     
  7. WW3QB

    WW3QB Ham Member QRZ Page

    What are you using to key the amp?
     
  8. KB0UOA

    KB0UOA XML Subscriber QRZ Page

    Yaesu ft-101f
     

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