speaker connected to No 19 set

[Robert Bergeron]

Interesting second paragraph . What does it mean ?

[Chris Suslowicz]

Originally Posted by Robert Bergeron

Interesting second paragraph . What does it mean ?

It means they used the intercom amplifier to drive the loudspeaker once they were set-up in position. (More power available than from the 'A' set audio output stage.)

You should be able to drive that at a reasonable level from the 'A' set, just use about a 70 ohm resistor in series with one of the loudspeaker terminals and connect it to the 'phones' output in a droplead or the terminal block in the control unit. Add more series resistance if too loud, reduce if not loud enough, but 70 should be enough to keep the 'A' set safe from overload.

I'll give it some more thought later. (There may be diagrams!)

Chris.

[Bruce MacMillan]

apparently it was something that was done but not an official mod.

[Chris Suslowicz]

That may well be the origin of Control Unit 190.

UK War Office saying "Nothing official exists, local bodges only." and Canada thinking "OK, there's a need for this, let's do it properly".



Chris.