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Ralph Mowery Ralph Mowery is offline
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Default Odd wiring in tube ampmschematics

In article ,
says...

For a 3 wire power system (with grounded chassis) that is incorrect as
you suspect.

For a two wire power then it is correct to have the switch on one side
of the line and the fuse on the other as you don't know (unless the plug
is polarized) which side is hot when plugged in.



I am getting into this late.

When replacing the line cord on an older 2 wire cord ( no ground) with a
3 wire grounded cord, which is the perferred method ? Go from the hot
wire to the switch or the fuse first, then to the other and transfromer
, back to neutral ? Of course the grounded pin on the plug goes to the
chassis and the 120 VAC is isolated from the chassis by the transformer.

Several of us were discussing this the other day, but none of us knew
for sure which should come first, switch or fuse in the 3 wire 120 vac
equipment.


It did seem that in the older ARRL Handbook the 2 wire cords had the
fuse on one side and the switch on the other side of the transformer.