How much plate current are the 300B's being run at? How much current on the front end tube.
I went to our website (www.magnequest.com) but the SETH there is the 2A3 version---
our 04-002 chokes can be airgapped for 100 mils, 150 mils, and 200 mils.
Advantage of 150 mil choke (all other things equal) is that you would get 150% more L--- which makes for better power supply filtering (again, all other things equal).
MSL
Builder of MagneQuest™ & Peerless™ transformers since 1989
