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The '''Tektronix Type 503''' is a low-cost, low-bandwidth monolithic oscilloscope [[introduced in 1960]] | The '''Tektronix Type 503''' is a low-cost, low-bandwidth monolithic oscilloscope [[introduced in 1960]] specializing in X-Y mode but also containing a sweep circuit. It features differential signal inputs. | ||
specializing in X-Y mode but also containing a sweep circuit. It features differential signal inputs. | |||
There is a similar sister model, the [[504]], with single-ended inputs. A rack-mount version, the ''RM503'', | There is a similar sister model, the [[504]], with single-ended inputs. A rack-mount version, the ''RM503'', | ||
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It is basically a tube-based (secondary) switch-mode power supply (SMPS). | It is basically a tube-based (secondary) switch-mode power supply (SMPS). | ||
A [[6DQ6]] power pentode, V620, feeds switched primary current to transformer T620. | A [[6DQ6]] power pentode, V620, feeds switched primary current to transformer T620. | ||
The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate efficiently with | The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate efficiently with much lower core mass than would be required for a transformer operating at mains frequency. | ||
much lower core mass than would be required for a transformer operating at mains frequency. | |||
==Pictures== | ==Pictures== | ||