549: Difference between revisions

549 (view source)

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 The −12.4 V regulator is transistor-based.
-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 +100 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.
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