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Re: [Amps] Drake L7 issue

To: <amps@contesting.com>
Subject: Re: [Amps] Drake L7 issue
From: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 26 Sep 2014 21:42:12 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
"The L7 schematic http://www.qsl.net/ea4bb/EA4BB/Old_Radios_files/L7.pdf
shows the connection to be two lines only (2 lines and ground).  The
120V fans are connected across one of two primaries of the filament
transformer but there is *no* connection to Neutral and the only ground
connection is the chassis of the power supply (and via the power supply
cable to the RF chassis)."

By 1979, I thought all amp manufacturers knew not to use ground as a current-carrying conductor. Same issue with the Alpha 70/77 series and some Henry amps. The fix for the Alpha 70/77 is to use a 4-wire cord and cut one jumper on the male Cinch-Jones power connector. It doesn’t even require getting into the amp. To correctly convert the L7 may take a bit more work, but it looks manageable. Or, live with it knowing that limitation.

Paul, W9AC


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