9558B

2-inch diameter, lime soda glass top window photomultiplier. S-20 type semi-transparent photocatode, with sensitivity extending from red to blue; 11 venetian-blind dynodes coated with CsSb. Extended temperature range. Intended for flame spectrophotometry and for applications in astronomy. 19 pin, B19A, glass base.
EMI/US, North Hollywood, CA, USA, known manufacturer.