434: Difference between revisions

434 (view source)

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 that is on a separate small board.  The input amplifier contains a JFET source-follower buffer
 that uses a [[2N5911|2N5911A]] (Tektronix part number 151-1032-00) biased with a drain current of 12.5 mA
-and Vgs of -0.26 V.  The input amplifier has unity gain, high input impedance, and an output impedance of
+and V<sub>gs</sub> of –0.26 V.  The input amplifier has unity gain, high input impedance, and an output impedance of
 about 120 Ω.  The input amplifier drives a Tek-made differential amplifier chip, part number [[155-0050-01]].
 The original instrument design utilized an all-discrete switching power supply, making this an incredibly light portable scope.
 Unfortunately, this power supply was extremely difficult to troubleshoot when it went belly-up.
-At serial number B500000 and later, the design of the supply was simplified
+At serial number B500000 and later, the design of the supply was simplified to use the same basic circuitry as found in the [[7704A]] using a [[155-0067-02|Tek-manufactured controller chip]].
-to use the same basic circuitry as found in the [[7704A]] using a Tek-manufactured controller chip.
 ==Repair Issues==