Revision as of 23:55, 10 October 2021 by Peter(talk | contribs)(Created page with "{{Vacuum Tube |Type=Tetrode |Number=7587 |EuroNumber= |Part_nos=154-0207-00 |Description=tetrode |Used_in=581;585;581A;585A; |Designers= }} used in the 580 series. =...")