Wow, that is tragic.
I have two extra CS1 tubes should you need one. Oliver had sent me a couple when we were trying to suss out a problem that I was having.
Turned out to be the head basket (which I have the original still), two little pices of wire in the head basket never got soldered. I kept hearing a slight distortion when anyone would sing into the mic. Sent the whole thing back to Oliver 3 times, he could not hear it. Finally on the third time he has his wife listen, she couldn't hear it either... until Oliver went to take the mic off the stand. Then she heard it. If you take the head basket and shake it, it sounds like a little maraca...
It's funny/ironic but I just went through a situation with several parallels. My 250-ish mic started weird clipping behavior. I was doing a SAG (union) date with a hard time cutoff and a revolving door of soloists. A particularly powerful female singer was hitting notes that were initially clean but, as she sustained and vibrato'ed the notes would start to clip and scoop down in level (visually obvious in the waveform). Thank God for iZotope RX DeClip because I was able to save it with some creative surgery. Anyway, what seems like the problem turned out to be was that the screw that attaches the capsule mounting post to the basket's deck plate had worked its way loose and--not unlike a maraca--when I gently shook the mic back and forth I could feel the capsule assembly flopping around in there. Since I needed to use the mic again a day or two later, I did the surgery required to securely reattach the mounting post: not for the faint-hearted or fumble-fingered person. And having been cautioned that the super high impedance parts of the mic's circuit in the capsule area are very sensitive to contamination, I throughly washed my hands, then washed them again twice with isopropyl alcohol. To be safe, I auditioned around 5 NOS tubes I had been collecting over the years (GE ***** 6072's, NOT AC701's!) and replaced the tube as well. This reminded me again that each of these tubes has its own sonic personality and I kept basic notes about the sonic personalities for future reference. Anyway, the mic may now sound better than it ever has, or at least better than it has in a while--I did vocals all day again the other day and loved it.
I posted all this in case it might help someone else sort out a problem. Now 'back to your regularly-scheduled broadcast'. rader ranch, good luck with your CS-1.