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The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] | The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] | ||
that takes a [[Letter-series_and_1-series_plug-ins|letter-series | that takes a [[Letter-series_and_1-series_plug-ins|letter-series | ||
or 1-series vertical plug-in]] | or 1-series vertical plug-in]] that was [[introduced in 1966]] and discontinued after 1973. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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The 549 power supply uses a [[delay relay|6N030 delay relay (P/N 148-0021-00)]] to control a relay that switches supply voltages on only after the tubes are warmed up. On power up, only heater voltage is applied to the tubes. After a delay of up to 60 seconds, the thermal delay relay activates the main relay (driven from unregulated +170 V). This also cuts out the delay relay, which can cool down and will be ready to delay again even after a quick interrupt in power input. | The 549 power supply uses a [[delay relay|6N030 delay relay (P/N 148-0021-00)]] to control a relay that switches supply voltages on only after the tubes are warmed up. On power up, only heater voltage is applied to the tubes. After a delay of up to 60 seconds, the thermal delay relay activates the main relay (driven from unregulated +170 V). This also cuts out the delay relay, which can cool down and will be ready to delay again even after a quick interrupt in power input. | ||
The 549 has a 65°C/150°F [[thermal cutoff]]. | |||
==Links== | ==Links== | ||