bitrex wrote:

----------------


Phil Allison wrote:

** The only way to explain your results is that there is a low impedance path between the plates of the tube - maybe just after the coupling caps.

So not faulty components, a PCB issue.

Cleaning the area with a good PCB solvent is a sensible first step.





Fixed, cause was crudded up/flaky solder joints on the interconnect
cable header coming from the tube board to the solid state section.



** I guess that is the nearest thing to "thanks" I'm gonna get ....


...... Phil