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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
These days anything not found with 10 minutes of Internet searching counts as a respectable challenge! Any chance your label once said S-20 or S-25? I found this Image with a curve for "Super S2", but on closer inspection it appears to be "Super S2 5".
from
Good luck! What spectral range are you interested in?
Searching for "S2 photocathode" produces a few results and a description. - "S2 photocathode with larger spectral response. (from 180 to 900 nm), but reduced efficiency, being only 5% at its maximum." (larger and reduced being relative to another detector). The S response combines the photocathode and the window response so presumably your device has a quartz window.
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
S2 tubes were manufactured by various makers I did use one from Thorn EMI many years ago and 200nm to 900nm is correct as we used it on a spectrometer for looking at stars. We also cooled the PMT to -50 degrees celsius to minimise noise
Registered Member #1517
Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
NICE!
This is awesome stuff. I've pinged JEDEC for the archived publication. It wasn't scanned in 1997, hence not being listed on their site. They're looking into it tomorrow. I knew you guys would have something.
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PMT S-curves
