[Boatanchors] TV-7D/U Line cord (was TV-7D/U line adjust rheostat)

[Rick Poole]

At 01:55 PM 12/31/2011, Gary Schafer wrote:

 >>>>>
>You may be able to use the other end of the pot if it has the third unused
>terminal. Sometimes one end opens up and you can still use it by connecting
>to the other end and center. Of course it will work backwards but it may get
>you going.
<<<<<

Isn't it amazing how great minds think alike?  :-)

That's what I'm doing, temporarily at least.  I found an Ohmite 
RHS250E on Mouser, which seems like it will just barely fit, and is 
25 watts which is about what the old one was (200 ohms at 0.35 
amps).  It's 250 ohms vs 200 ohms but that should be fine.  Clearly 
25 watts is marginal at best but so far I can not find a higher power 
rated rheostat that will fit in the available space.  So I'll wire 
the current one backwards until the new one gets here.

Haven't done that or tried plugging the tester in yet, because I have 
one other question...

With the original line cord, one side goes to the on/off switch and 
the other side goes to the rheostat and "fuse" bulb.  Seems rather 
odd to me that the "hot" side doesn't go to all three 
devices.  Anyway, the original line cord wire is so contaminated that 
it will no longer take solder, so I am replacing the power cord with 
a three wire cord, with the green wire being grounded to one of the 
mounting screws of X112.

My question is, is there a preference to which of the other two (hot 
and neutral) I should connect to the power switch, and which to the 
rheostat / fuse bulb?  Resistance is infinity between either side and 
the front panel, so I'm assuming it doesn't especially matter, but 
there may be something I didn't think of.

I'm thinking of an issue I had with my DX-100, where a previous owner 
had replaced the two-wire line cord with a three-wire cord and then 
fused the neutral side instead of the hot side, and I found out about 
that the hard way :-(.  Seems rather, shall we say, counterintuitive 
that either the fuse bulb or the on/off switch should be in the neutral side.

Rick WA1RKT