02-09-2021, 12:17 AM
(01-09-2021, 09:33 PM)Amie Wrote: I would agree that the rod pentodes seem a lower noise option to wound grid types.
I'm getting to think that, too.
The screen-grid current in the rod pentodes is a small fraction of anode current, well under 1/10, which contrasts with a traditional, helical-grid pentode where screen-grid current is often around 1/6 of the total current.
That being so, partition noise can be expected to be rather smaller in the rod pentode.
I do have an intention to try building a magnetic pick-up preamplifier and equaliser using rod pentodes, but that'll have to wait another day!
