[Amps] Drake L4B

[R@contesting.com]

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