[Amps] Drake L7 issue

[Joe Subich, W4TV]

> To correctly convert the L7 may take a bit more work, but it looks
> manageable. Or, live with it knowing that limitation.

The L7 has no neutral connection and the ground is not current carrying.
The ground connection on the L7 power connection is equivalent to the
"safety ground" on a 115V circuit as there is no connection to the
transformer primary "center tap".

73,

    ... Joe, W4TV


On 2014-09-26 9:42 PM, Paul Christensen wrote:
>> "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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