Created page with "Several tube-era Tektronix oscilloscopes such as the 549, 581 and 585 contain a circuit that delays turn-on of the main high voltage supplies until the tubes are w..."
(Created page with "Several tube-era Tektronix oscilloscopes such as the 549, 581 and 585 contain a circuit that delays turn-on of the main high voltage supplies until the tubes are w...")