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== CRT Circuit == | == CRT Circuit == | ||
The CRT circuit in the 555 | The CRT circuit in the 555 is really two separate modules. | ||
It is split between two internal metal enclosures, each one containing a high voltage transformer and associated tubes. | |||
The lower beam HV power supply is based on transformer T901 and produces: | |||
* CRT anode voltage: +8650V | * CRT anode voltage: +8650V | ||
* lower beam CRT cathode voltage: -1350V | * lower beam CRT cathode voltage: -1350V | ||
* lower beam CRT control grid (blanking) voltage: floating, -1500V | * lower beam CRT control grid (blanking) voltage: floating, -1500V | ||
The | The upper beam HV power supply is based on T801 and produces: | ||
* upper beam CRT cathode voltage: -1350V | * upper beam CRT cathode voltage: -1350V | ||
* upper beam CRT control grid (blanking) voltage: floating, -1500V | * upper beam CRT control grid (blanking) voltage: floating, -1500V | ||
Rectification is performed by a total of six [[5642]] rectifier tubes. | |||
Each of the two HV power supplies is independently regulated using | |||
a two-stage common-cathode amplifier based on a [[12AU7]] dual triode. | |||
The oscillator tube is a [[6CZ5]] power pentode. | |||
==Pictures== | ==Pictures== | ||