[Amps] pink ceramics

[John T. M. Lyles]

Pink ceramic was high in magnesium content I believe. It came from 
the Frenchtown ceramic factory, and was used by RCA for many years on 
their expensive Cermelox tetrodes and other big tubes (up to $100K in 
value). Purple/pink hue came in some Russian tubes from their own 
similar source. The US source has dried up, and now alumina ceramics 
come from others like Coors, Wesgo, Kyocera. We don't know of any 
advantage over the pink except it was 'pretty' and unique. I have a 
gold plated 8501 tetrode on my shelf at work, with violet ceramic, 
from RCA/Burle Industries.

73
john
K5PRO

Ian, G3SEK said
>While we're on the subject, it is a total myth that pink ceramic means
>BeO.