Beckman DB-G Grating Spectrophotometer teardown

Beckman DB-G Grating Spectrophotometer, Cat NO. 1403.

Links: Grating Spectrophotometer DB GT (1961), University of Queensland Physics Museum

Bulbs:
E 871 (3 leads, HID, for UV)
GE 2331 (visible, 5.9V, 4.66A, 25W)

photomultiplier RCA IP28A, 69-04 (Anode supply: 1250V. Voltage between dynode No9 and anode: 250V. D-C anode current: 2.5ma. Ambient temperature: 75 Deg C. Package: 1-5/16″ D x overall length 3-11/16″ long. Seated height 3-1/8″ long. base: 11 pin plug-in with socket and 30″ cable. Note: Specification sheet available. Maybe replaced with 931A, average anode characteristics are the same.)

Photomultiplier board:
Vacuum tubes:
5654
12BH7A

Main board:
Adams and Westlake Mercury Wetted Contact Relay – MWSL-15093-1B
Vacuum tubes (all filaments lighted):
12BH7a
6973
6EM5
6AX5
85A2/0G3
12AX7

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