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Valve/Tube etched ARBI. | diyAudio
https://www.diyaudio.com/community/threads/valve-tube-etched-arbi.362559/
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.
RAYTHEON ARBL 12AX7 ECC83 TIGHT MATCH PAIR …
https://reverb.com/item/50348322-raytheon-arbl-12ax7-ecc83-tight-match-pair-short-plate-halo-getter-test-nos-minty-vintage-1963
BRENT JESSEE RECORDING HOMEPAGE
https://www.audiotubes.com/
BRENT JESSEE RECORDING & SUPPLY, INC. 1590 West Algonquin Road #111 Hoffman Estates, IL 60192 Voice Phone 847-496-4546, Monday-Friday 8AM to 4PM USA Central Time
Antique Radio Forums • View topic - 12AX7/A & Tube Etching ID
https://www.antiqueradios.com/forums/viewtopic.php?t=212966
“ARBL” in light white font near the top of the tube. Manufacture/date code is P280C 64-33 (The “280” = Raytheon manufacturer code), so the tube was made in ’64 during heyday of US tube manufacturing. Nicely balanced tube testing strong as nominal new: tested at 100% of nominal new on both triodes.
Tube/Valve etched ARBI.- Vinyl Engine
https://www.vinylengine.com/turntable_forum/viewtopic.php?t=120858
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Endocrinology Laboratory Shipping Information
http://csu-cvmbs.colostate.edu/academics/bms/ARBL/Pages/endocrine-lab-shipping-info.aspx
Endocrinology Laboratory ARBL/Foothills Campus Colorado State University Fort Collins, CO 80523-1683
【Fighting Board】PS4+ Audio Fighting Board …
https://www.youtube.com/watch?v=j7U_arbl9nw
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