07-28-2017, 05:57 AM
Loud buzzing persists, even after changes per the Philco bulletin. A portable transistor radio also picks up this buzz when placed near the vibrator assembly. O'scope shows a clean DC level and voltmeter measures around +125vdc, so this appears to be RF noise. I ordered some correct buffer capacitors, as the Z5U tolerance is unsuitable. But I don't believe this cap is the root cause. Any other suggestions to quiet this thing down? The radio seems to be working fine otherwise.
