I have a CA-1000 which I'm looking at as I type. I bought this new in 1976 and listened to it until a few years ago when I got a new set-up. Yup, I still have the original box and manual. Only thing it needs is to go through it and clean the pots and switches, kinda noisy. Purchased a pair of NS500's, which are bass reflex, at the same time. Still have those too but the foam speaker surounds surrendered.
The class A switch gave me a more refined sound but if I remember correctly the manual warns not to listen at high levels or for long periods of time in class A mode because of heat build-up. Not sure what you mean by sound breaking up. Could it be a dirty pot or switch or is it directly linked to going to class A mode? Mine doesn't have a DC/Normal switch so I'm not sure what this is for.
The class A switch gave me a more refined sound but if I remember correctly the manual warns not to listen at high levels or for long periods of time in class A mode because of heat build-up. Not sure what you mean by sound breaking up. Could it be a dirty pot or switch or is it directly linked to going to class A mode? Mine doesn't have a DC/Normal switch so I'm not sure what this is for.