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==Internals== | ==Internals== | ||
The vertical amplifier in the 7704A uses the [[155-0077-00]] hybrid. | The vertical amplifier in the 7704A uses the [[155-0077-00]] hybrid. | ||
In the 7704A, the [[7000 series readout system|readout board]] is located behind a back panel carrying two [[LEMO S-series connector]]s for probe power. This placement was intended to allow easy retrofitting of a readout board into an Option 01 instrument, however, the readout board is not a plug-in card − several cables have to be attached to the board. | |||
The 7704A SMPS uses a custom Tek chip ([[155-0067-02]]) to implement the control functions. Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. Early 7704As use a diac in the starter circuit. Later 7704As use a unijunction transistor in the starter circuit. | The 7704A SMPS uses a custom Tek chip ([[155-0067-02]]) to implement the control functions. Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. Early 7704As use a diac in the starter circuit. Later 7704As use a unijunction transistor in the starter circuit. | ||