[Amps] Drake L4B

[Gary Smith]

Oops!!!! I meant 750 watts, not that other delightful figure.
73,
Gary... wa6fgi
  ----- Original Message ----- 
  From: Gary Smith 
  To: R at contesting.com;Measures ; Keith Dutson 
  Cc: amps at contesting.com 
  Sent: Saturday, July 16, 2005 2:31 PM
  Subject: Re: [Amps] Drake L4B


  Are both tubes working? Sounds like one of the jugs is soft or has gone south.  With 65-75 watts of drive the figures should be in the 7500 watt area
  73,
  Gary... wa6fgi
    ----- Original Message ----- 
    From: R at contesting.com;Measures 
    To: Keith Dutson 
    Cc: amps at contesting.com 
    Sent: Friday, July 15, 2005 1:07 PM
    Subject: Re: [Amps] Drake L4B



    On Jul 15, 2005, at 12:43 PM, Keith Dutson wrote:

    > Hi, am new to this list.
    >
    > I recently acquired a Drake L4B.  The previous owner said the amp had 
    > been
    > "refreshed" several years ago but not used for more than 2 years.  A 
    > friend
    > who has all Drake equipment looked it over and gave thumbs up to 
    > condition
    > of the unit.  The bandpass and power switches are tight and smooth.  
    > The fan
    > is quiet and in perfect shape.  The power supply has been rebuilt using
    > modern caps and solid state diodes.  Voltage output has not been 
    > measured.
    > Output in CW/Tune is about 540 watts as measured by an Alpha 4510 
    > wattmeter.
    > This seems low.  What should I look for?

    Input SWR of > 1.4:1 typically reduces the power delivered by a 
    solid-state exciter.  If the AØ anode / plate current is under 700mA, 
    not enough drive is arriving at the cathodes of the 3-500Zs.
    >
    > Thanks in advance for your advice.
    >
    > 73, Keith NM5G
    >
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    >



    Rich Measures, 805.386.3734, AG6K, www.somis.org

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