February 25, 2026 - Tested this unit - the output was low because the unit output is 500 ohms and my little speaker is 8 ohms. Also ordered a 3W 120V lamp for the oscillator circuit - no continuity on lamp in unit. I'll be testing the tubes next and already plan to replace the paper capacitor(s).
February 19, 2026 - Purchased this as a futire project - waiting fo it to arrive. These were HP's second audio generator and was guilt in the learly 1940's.
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