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Thursday, September 9, 2021

CONTINUITY: Hewlett-Packard 150A Oscilloscope Restoration: Part 3

With basic functionality restored, the focus turns to the inoperable second channel, a mystery thermistor, dodgy tubes, leaky capacitors, calibration, and the eternal confusion of RMS and peak-to-peak AC voltages. The behaviour of vacuum tube direct coupled and balanced amplifiers can be subtle, and even the slightest change can be puzzling.

Posted at September 9, 2021 11:14