[sdiy] Tube amplifier question

[harrybissell]

The old "hot chassis" TV circuit is not appropriate for an application where
cables will leave the enclosure...

Even IF you could count on the plug polarity, you cannot count on the wiring
of
any building being correct.

I have been 'blasted' by many older guitar amps that used such designs... I no

longer allow them in my sight ;^P

And hey Juergen, what's up with this sudden interest in the "dark side"  ???
<bfg>

H^) harry   (who realizes that our diy folks really CAN play with hot chassis
and not
kill themselves...on most days  :^)

jhaible at debitel.net wrote:

> > Japanese Power source is 100V. and it doesn't have grand line. it's just
> > unbalance transfer. so we always get trouble, in this case.
>
> In Germany, we also have an unbalanced power, 230V. (Actually that's part
> of a 3-phase system, so there is symmetry of another kind in there).
> The problem is that all our plugs are completely symmetrical, so we have
> a 50% chance of getting the hot wire and 50% of getting the cold wire.
> Fortunately, we have a separate protection GND - this is where a
> metal enclosure will be connected. But of the two power lines, we never
> know.
>
> JH.
>
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