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549: Difference between revisions
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added delay tube Part No
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The -12.4V rail is all transistor regulator. | The -12.4V rail is all transistor regulator. | ||
A thermal delay tube which controls a relay is used to delay the plate voltages to the Tubes till they are warmed up. On power up, only heater voltage is applied to the tubes, which also drives the thermal delay tube. After a time delay of up to 60 seconds, the thermal delay tube activates the relay, powering all outputs ON. Unregulated +100V is used to drive this relay. | A thermal delay tube - Tek Part 148-0021-00 or 6N030 - which controls a relay is used to delay the plate voltages to the Tubes till they are warmed up. On power up, only heater voltage is applied to the tubes, which also drives the thermal delay tube. After a time delay of up to 60 seconds, the thermal delay tube activates the relay, powering all outputs ON. Unregulated +100V is used to drive this relay. | ||
The circuit is designed such that Thermal delay tube cut itself off the circuit once it turns the relay and outputs on, but holding the relay on. | The circuit is designed such that Thermal delay tube cut itself off the circuit once it turns the relay and outputs on, but holding the relay on. | ||