I have a pair of 9 pin valves, small round chrome getter on a copper post,14mm grey plates, copper wire to the pins. I believe they are American 12AX7 possibly RCA no markings other than ARBI. the full stop is also etched in to the glass, the ARBI. letters fascinate me can anyone confirm that valves used in the American space program were marked ARBI. as I believe I read years ago or is there a different explanation please.
ARBl has "offices " in Wilmington DE 19808 this type of business address is also used by others is to keep secret their real operating address and if you look at some of the clients like Dassult Falcon and others its obvious its a low profile company by choice .
NASA would be one connection where secrecy is paramount and their contract would stipulate that .-
2711 Centerville Road, Suite 400 Wilmington, DE 19808 - Bizapedia
NASA would be one connection where secrecy is paramount and their contract would stipulate that .-
2711 Centerville Road, Suite 400 Wilmington, DE 19808 - Bizapedia
I have just found out they are a military/space tube, quite by accident I found reference to Analog Radar Broadcast L-Band ie ARBL not ARBI full stop1960's Raytheon USA Official NASA Contractor probably ARBL CODED JRP-12AX7; L-Band primary surveillance radar is the world's most flexible, modern and cost-effective solution for ATC needs. The device offered easy expandability and could be adapted to handle high, medium or low traffic volumes for enroute, approach/departure, and extended terminal airspace coverage.
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