7 pin (both ends) Tube condenser mic Cable?

Hi, Strat. What's going on with the cable you have? Maybe you could repair it. Are you able to pull back the connector housing and see what's connected to what?
 
Semi related... I got a brand new "pro" quality patch cable recently that shorted out within a few months. I pulled back the housing and the bare copper strands were all mashed up and jamming onto the totally WRONG parts of the connector. Fruuuug! I was going to just snip back the cable, restrip the wires and solder it again but I was actually able to slide a a couple little strips of electrical tape in there to stop it from shorting out.
 
Anyway... if the cable run, or at least a section of it is still good (which can be tested if you have a meter) you could just write down what wire connects to what pin and resolder the bugger. I used to have to do this with a proprietry speaker cable for my old bass cabinet every time it got hosed.
 
Of course you'll want to be super careful because a mistake may destroy the mic.
 
And yes... there is likely a special wiring config that if not used could send juice somewhere it should not go and end in tears.

I wouldn't take a chance with a substitution unless a replacement becomes unavailable. There may be  a standard out there, but that doesn't mean that your mic follows it. In addition to the standard condenser mic connections, there could be wires that handle pattern switching and voltages for the tube, if it's in the mic body.
 
If you can't get a proper replacement, get one that has a compatible pin configuration and have a tech make sure that both cables really do have identical connections. You might be able to do it yourself with a multi meter or continuity checker.