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585: Difference between revisions
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Several improvements were published for the 585 circuitry, including the enhanced trigger circuit. | Several improvements were published for the 585 circuitry, including the enhanced trigger circuit. | ||
If all of those changes are applied to a 585, it is essentially a 585A. | If all of those changes are applied to a 585, it is essentially a 585A. | ||
===Power Supply=== | |||
The 585 power supply is similar to other Tek scopes of the era such as the [[549]]. A linear regulator with a [[5651]] reference tube, a [[12AX7]]/[[6AU6]] error amplifier and three parallel [[12B4]] series pass tubes produces −150 V. This is the only adjustable rail, all other regulated voltages are referenced to it. The +100 V and +350 V regulators use half a [[6080]] each as the pass element, the +225 V two. In the +500 V path, a [[12B4]] performs this function. The unregulated +325 V input to the 225 V supply is used to supply the HV oscillator, a [[6AU5]]. | |||
A transistor-based regulator supplies a +12.6 V heater voltage to the plug-in. | |||
A [[delay relay|6N045 delay relay]] controls a multi-contact relay to switch supply voltages on only after the tubes are warmed up. When the main relay engages, the delay relay is cut out so it will be ready to delay again even after a quick interrupt in power input. | |||
The 585 has a [[thermal cutoff]]. | |||
===Semiconductors=== | ===Semiconductors=== | ||