Search Results for: Amplifier tubes
this had a surprisingly recent date of on the packaging. original advertisments for these devices tiny p cell, " high, western electric a ( " high), unknown, sylvania /pala g ke cintel gs osram cm , baird va , cintel gs , valvo av ( " high). advertisment for photometer tube containing photocell and amplifier
valve in the same envelope. selenium photo-resistive cell, with box photomultipliers highly sensitive light detecting devices, used for specialist applications like spectrometry and high-performance image scanners (although semiconductor devices have now replaced them) two fairly modern tubes, rca a...
http://www.electricstuff.co.uk/Photocell.html