Oops!!!! I meant 750 watts, not that other delightful figure.
73,
Gary... wa6fgi
----- Original Message -----
From: Gary Smith
To: R@contesting.com;Measures ; Keith Dutson
Cc: amps@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@contesting.com;Measures
To: Keith Dutson
Cc: amps@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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