06-06-2025, 08:47 AM
MrFixr
The chassis, if there is no ground pin in the AC plug, due to the Y-caps from L/N to the chassis, is at 60VAC relative to the L or N, or Earth.
If there is a leakage from L/N to B+, this could result in some AC measured during warm-up until the tubes start conducting and present some load to lower the AC component on B+.
This is a far-fetched theory, of course.
And it could be refuted by temporarily removing the filter caps from the circuit and re-measuring.
The chassis, if there is no ground pin in the AC plug, due to the Y-caps from L/N to the chassis, is at 60VAC relative to the L or N, or Earth.
If there is a leakage from L/N to B+, this could result in some AC measured during warm-up until the tubes start conducting and present some load to lower the AC component on B+.
This is a far-fetched theory, of course.
And it could be refuted by temporarily removing the filter caps from the circuit and re-measuring.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
