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7404 and 5691 tube available or substitute?

Hi all.
I have a set of cary slm 70m monoblocks. I don't need them yet, but I was browsing out of curiosity. These amps use a 7404 and a 5691 tube. It seems there are none on the market. Is there a substitute available for these or am I in for trouble when these tubes quit.
Thanks for any help
skipper320

Showing 1 response by skipper320

skipper320 OP
89 posts
 
Thanks for the help. I feel pretty dumb on this one. apparently the 7404 is the production date in this tube. It is an RCA and looks like its from the 70's. I have been told that this tube is actually an OC3 voltage regulator tube. Does that sound correct?
Thanks
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