ID:
2403
Maker's Name:
Philips
Where made:
Holland
Dimensions:
1.7 × 1.7 × 6.5 cm
This Special Quality (SQ) valve was probably used in a long-tail pair or flip-flop configuration in an analogue computer.
SQ valves were made to have a variety of specifications:
Long life, typically 10,000 hours
Reliability
No cathode interface generation
Usable in standby mode with no Anode current
Proof against vibration
Suited to use in computers, audio amplifiers, telephone line amplifiers, industrial environment
Most SQ valves were made in one factory in Holland. Also made in the Eastern Bloc in E Germany, Hungary, Russia
