I have an Eight Ball (1977) head with a transformer/rectifier combo that are working. I'd like to move this into a Stern Trident to replace a rusted 16B-3 and broken rectifier. I can always repair the Eight Ball down the road, I prefer Trident as a machine so I'd rather get that one back up and running. Are these inter-changable? They seem to be, just wanted to make sure before I made a poor assumption.