[Amps] Drake L7 issue

[Joe Subich, W4TV]

> I don't know the L7, so I don't know if it uses 120V for anything
> (like a fan), but the proper connection of 240V is two hots and a
> ground, NOT neutral.

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).

73,

    ... Joe, W4TV


On 2014-09-26 6:18 PM, Jim Brown wrote:
> On Fri,9/26/2014 3:08 PM, Jim Thomson wrote:
>> ##  You are probably feeding 120 vac into the 220 vac input of the
>> amp.   Check your new 220 vac run.  Sounds like you have a hot +
>> neutral  reversed at one end of the new run.
>
> Yes, or something similar.  Make sure that you feeding the amp with the
> two sides of 240 V, NOT between hot and neutral or hot and ground.
>
> I don't know the L7, so I don't know if it uses 120V for anything (like
> a fan), but the proper connection of 240V is two hots and a ground, NOT
> neutral.  Neutral should be connected ONLY if there's a 4th wire in the
> amp cable for that 120V fan.
>
> 73, Jim K9YC
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