06-11-2021, 11:52 AM
Hello all,
I've just started restoration on a RCA 5QR73PX (Graetz 4R-216 in disguise) that has a pair of electrostatic tweeters that don't seem to work; no sound from either. I'm looking at replacing them with regular paper cone tweeters. What I need is a plan on rewiring to the output transformer (diagram below). I'm thinking that the separate secondary can be disconnected from the B+ and used for driving the tweeters and a crossover. Otherwise, they can be connected to the main speaker through a 3 mfd crossover.
I've just started restoration on a RCA 5QR73PX (Graetz 4R-216 in disguise) that has a pair of electrostatic tweeters that don't seem to work; no sound from either. I'm looking at replacing them with regular paper cone tweeters. What I need is a plan on rewiring to the output transformer (diagram below). I'm thinking that the separate secondary can be disconnected from the B+ and used for driving the tweeters and a crossover. Otherwise, they can be connected to the main speaker through a 3 mfd crossover.
