I have read on a few forums that predating the introduction of the 6as7 (radiomuseum says '35 but the oldest schematic I've found is '38) that many other large, low mu triodes were used as pass tubes or regulators, including the 300b. However I have never seen any of these schematics. Does anyone happen to have one to share? Does anyone have any interesting tid-bits on the development of dedicated regulator tubes?
...and what's the oldest HV DC tube regulated circuit that you're aware of? When did those designs pop up? Were other triodes used multi-purposefully for that role before the 300b? I'd imagine tubes like the 45 would work fairly well. Not that I would use one that way... just, curious...
I just can't seem to successfully search for such a thing, since the internet is so densely populated with hits for any search including "300b."
...and what's the oldest HV DC tube regulated circuit that you're aware of? When did those designs pop up? Were other triodes used multi-purposefully for that role before the 300b? I'd imagine tubes like the 45 would work fairly well. Not that I would use one that way... just, curious...
I just can't seem to successfully search for such a thing, since the internet is so densely populated with hits for any search including "300b."
