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Battel Engineering, Inc.
10020 North 58th Street
Scottsdale, AZ  85253
office: (480) 991-9747
fax: (480) 991-9748
email: bateng@earthlink.net

85. Vacuum Tube X-Ray Source Modulator

Low Voltage pentodes such as the 1S4 are useful for simulating x-ray tube loads that use low voltage filaments. The tubes can be matched and operated in parallel to drive VMI opto-couplers similar to the ones discussed in the previous picture. The feedback voltage to the tube grid modulates the load current in the same way that the control voltage controls the x-ray tube current. An interesting fact from this test setup is that the 1S4 tubes were new in the box with dates from 1949 to 1952. They all operated to specification when tested for use in the simulator.

 

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Image Steve Battel, Battel Engineering, Inc. All rights reserved.