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Hamamatsu makes several tubes with extended red response and they
are side window tubes just like the R928 so they should fit in the
BD PMT sockets. The tubes are R1477 and a new one R3896. Actually
the R928 is listed as an extended red responding tube (beyond 800nm)
but the 1477 and 3896 are better still. You can specifically request
high sensitivity tubes (essentially hand selected) at the expense
of slightly higher dark current. Generally flow instruments have
high ambient light levels such that dark current is not a problem.
Hamamatsu - 201/469-6640
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