Friend of mine still has a couple I believe. I'll get him to check the numbers on them (it's been a long while ago, and I can't remember any more). I'll also see if I can get a coupla piccies of them. The amps in question fed a radio relay network around large areas of the town. They were located in the cellar of a house in the centre of town. Above them on the ground floor, was our workshop, which was always lovely and warm in the winter :-)
On the first floor, above that, was the control room. The radio receivers were located there, and a large patchboard, where the distribution lines were routed, using the big old three pin Bulgin plugs and sockets. There was also a desk console, with an array of meters, which measured 'load'. They were actually measuring audio current going out on the lines.
We used to have fun on a slow Saturday afternoon, when there was no no bosses about, by waiting for an important set of sports results, and then either pulling the plug on a whole area, or switching in the spare receiver, which we had pre-tuned to an offshore pirate radio station. Then wait for the phone to start ringing off the hook down in the office, where some poor part time lady would be located to take any service calls ... :-))
Arfa