Designed to function as a red radiation detector in relay or measurement applications. New old stock * No longer available for export. MFR: Continental Electric, RCA SKU: 918
Designed to function as a red and infrared radiation detector in relay or measurement applications. New old stock * No longer available for export MFR: CBS SKU: 919
Designed to function as a red and infrared radiation detector in sound reproduction applications New old stock * No longer available for export MFR: RCA, CBS, Westinghouse SKU: 920
Designed to function as a photodetector tube in relay systems where very high light sensitivity is needed. New old stock * No longer available for export. MFR: RCA SKU: 931A-RCA
Designed to function as a red and infrared radiation detector in sound reproduction applications New old stock * No longer available for export MFR: CBS SKU: 1P31-CBS
Designed to function as a red and infrared radiation detector in sound reproduction applications New old stock * No longer available for export MFR: CBS SKU: 1P33-CBS