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502: Difference between revisions
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==Internals== | ==Internals== | ||
The −150 V supply uses a [[5651]] voltage reference tube as its reference. | |||
The 6.2 V<sub>DC</sub> heater supply for the tubes in the first stage differential amplifier is transistor-regulated. | |||
This heater supply uses the −150 V supply as its reference. | This heater supply uses the −150 V supply as its reference. | ||
There is no post-deflection acceleration. The CRT cathode voltage is −2.9 kV. | |||
The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer [[120-114]]). | The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer [[120-114]]). | ||
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This improvement allows slight differences in horizontal CRT sensitivity between | This improvement allows slight differences in horizontal CRT sensitivity between | ||
the two beams to be cancelled out in step 8 of the calibration procedure. | the two beams to be cancelled out in step 8 of the calibration procedure. | ||
Later 502A models have a solid state (plus [[nuvistor]]) input stage, | |||
a [[6DJ8]] as the deflection amplifier, and transistors as amplifiers and emitter followers (only in the newest version). | |||
The 502 has a 123 °F (50.5 °C) [[thermal cutoff]] switch. | The 502 has a 123 °F (50.5 °C) [[thermal cutoff]] switch. | ||