547: Difference between revisions

connector to the CRT vertical deflection plates. There is one tube in the vertical signal path,

vertical signal path when certain relatively modern plug-ins are used, such as the [[1A1]], [[1A2]], [[1A4]], and [[1A5]].

Those plug-ins have a small hole to the left of the plug-in to mainframe connector, so they can be fully inserted without pressing the spoiler switch.

The 547's power supply provides regulated outputs of −150 V, +100 V, +225 V, +350 V, as well as a +325 V unregulated output for CRT HV section.

Multiple secondary windings feeds diodes for rectification for different voltages, using both center-tap and bridge configurations. The regulator section uses no transistors, only tubes.

There are multiple 6.3 V secondary outputs for heaters, some elevated to different voltage levels based on the section/tube that is supplied, in order to keep the heater-to-cathode voltage level within limits.

As is common in many Tektronix scopes, all regulated voltages are referred to the negative regulated rail (−150 V in this case) by fixed low-tolerance dividers.

Most other power supply sections in the 547 replicate the same basic design, except slight changes in tubes used: the +225 V and +100 V regulators employ a [[6080]] as the pass element, and +350 uses a [[6CW5]].  

The plate voltage delay circuit is similar to that found in many may other Tek scopes of the same era. A [[6N030T|6N030T delay tube (P/N 148-0021-00)]] controls a relay that switches plate supply voltages on only after the tubes are warmed up.