I also have never read a reasonable explanation as to why the early grey riser versions bettered the later silver risers. Doing a search on the Tubes Asylum, I read that some have said that the early versions had a .028 diameter frame grid. Who knows if this was the main difference. I have recently put the question up on the tube asylum asking why and how regarding the differences, so maybe someone will give a good explanation. We'll see.
Siemens CCa: Gray and Silver riser differences
Has anyone heard both the silver and grey riser CCas. I understand that the only difference is the grey electrostatic coating on the earlier (mid 60s and earlier)shields. There is also the later 70s version with the wire getter support and it may be interesting to note how these sound as well.
Thanks,
Anacrusis
Thanks,
Anacrusis