I know the title is vague. I didn’t know what to call it. I’ve been trying to figure out how to find the appropriate specs for some lesser used tubes like the EF80 to be able to use in push pull designs. I know Rob Robinette has figured out that a 22k5 primary works well for a (2) EF80 setup but how does one come to that conclusion? When I research that tube, I can only find very basic specs like internal resistance and limiting values for plate voltage and dissipation. On most power pentode datasheets, you find ‘equivalent resistance plate to plate’ which helps you pick a transformer for your design. I realize the EF80 was designed to be an RF amplifier and as such, not intended for push pull amplifiers. Rob has proven that they can be used for that purpose though. I just don’t know how he came up with the proper impedance ratio, etc. Is there another way to compute this from such limited data?
Thanks,
-Aaron
Thanks,
-Aaron