John said: "Now, there may be something that I have not seen that has tubes for output and yet no tuning on the final and that requires a specific load resistance for Z match as does the SS equipment."
Jim Says, "Check out the Central Electronics 100V / 200V 100 watt transmitter with a pair of 6550's or the Central Electronics 600L linear amplifier with a grid driven 813. These are no tune tube circuits that work very well so long as the load is near 50 ohms resistive. These were way ahead of their time like standard front disc brakes on the Studebaker. Both companies disappeared in the 1960's too. Regards, Jim WD5JKO
