547: Difference between revisions

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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.
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. Both center-tap and bridge configuration is used. Its a all Tube design for the regulation. There are multiple 6.3V secondary outputs for heaters, many elevated to different voltage levels based on the section/tube its used for to keep the Heater-Cathode voltage level within limits.
Multiple secondary windings feeds diodes for rectification for different voltages. Both center-tap and bridge configuration is used. Its a all Tube design for the regulation. There are multiple 6.3V secondary outputs for heaters, many elevated to different voltage levels based on the section/tube its used for to keep the Heater-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. Only the −150 V voltage is trimmed, its reference is a [[OG3]] VR tube. A [[12AX7]] is used as the comparator, two [[6CW5]] in parallel are used as series pass tubes. A [[6AU6]] is used as an error amplifier.
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. Only the −150 V voltage is trimmed, its reference is a [[OG3]] VR tube. A [[12AX7]] is used as the comparator, two [[6CW5]] in parallel are used as series pass tubes. A [[6AU6]] is used as an error amplifier. Most other stages replicate the same design, except slight changes in tubes used − the +225 V and +100 V regulators employ a [[6080]] as the pass element, +350 uses a [[6CW5]].
 
Most other stages replicate the same design, except slight changes in tubes used − the , +225 V and +100 V regulators employ a [[6080]] as the pass element, +350 uses a [[6CW5]] - and reference for them is the -150V
 


The plate voltage delay circuit is as like in may other Teks, uses  a 6N030 delay tube (P/N 148-0021-00)  to control a relay that switches plate supply voltages on only after the tubes are warmed up. Heater voltage is directly applied to tubes on Power on.  
The plate voltage delay circuit is as like in may other Teks, uses  a 6N030 delay tube (P/N 148-0021-00)  to control a relay that switches plate supply voltages on only after the tubes are warmed up. Heater voltage is directly applied to tubes on Power on.  


==Links==
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