[ARC5] Progress on Auzzie AT5-AR8 Set

[Neil]

> One curious thing:  The filaments are strung to either
> be wired for 24V or 12V, DC or AC.  When 
> running them 12V, the manual calls for power pin
> 1 to be A+ and to tie pins 3 and 4 together for A-.
> These A- leads get "earthed" in the external power
> supply.  However- in my set, if you connect it this way,
> the chassis becomes +12 volts to "Earth," and if you
> ground pins 3-4, you have a short.  I don't know why yet.
> I simply reversed the wires, using 3-4 as A+ and 1 as A-.
> This worked fine and there's no electrical reason not to
> connect it thus.  It's actually OK with me, because I had
> to do exactly the same thing with the AT5 transmitter,
> but for other reasons.

Possibly related to the fact that British & Commonwealth
vehicles of the period and for several decades after were
positive-ground systems.

73 de Neil ZL1ANM