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547: Difference between revisions
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There is a 170 nanosecond [[delay line]] between the first and second gain stages. | There is a 170 nanosecond [[delay line]] between the first and second gain stages. | ||
===Power Supply === | |||
Power Supply | |||
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. | |||
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 - 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. | |||
==Links== | ==Links== | ||