info about EMI PMT ?

Dear all,

I am looking for some information (spectral response, gain, operating
voltage, ...) about a PMT presumably manufactured in pre-google times. On
the tube it says:

EMI
Type 955808
S/No 21091

Thanks for reading,
Kay

--
Kay-Obbe Voss
GSI / MF
Planckstrasse1
D-64291 Darmstadt