E55L Parafeed Spud Design - Your Thoughts

[euro21]

thermal runaway and high grid current of these frame-grid pentodes.

If you use CCS load, the runaway is impossible.

 

[v4lve lover]

you are correct, It took a while do get exactly what you mean through my system. But indeed, if grid current causes the tube to try to conduct more it will have the effect of lowering the voltage over the tube and hence dissipation.

 

[L0rdGwyn]

If you use CCS load, the runaway is impossible.

Good point. Ever try fixed bias in your E55L experiments?

 

[euro21]

I my -ad hoc- measuring set I usually use fixed bias and CCS load.