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RE: The 300b is one of the most linear amplifying devices ever invented

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Hi Eli,

"Slice and dice as much as you like, a SRPP is a stack of a common cathode under a cathode follower."

I re-read Broskie's article (referenced below) and I still come away with SRPP being a push-pull circuit where the upper triode sources current into the load, and alternately, the lower triode sinks current from the load. I understand it provides more or less balanced drive strength, depending on the circuit and load.

Inserting a choke, presumably between the lower triode's anode and the load connection at the upper triode's cathode, prevents the lower triode from driving the load, effectively turning it into a common cathode amplifier driving a cathode follower with common DC bias. It no longer operates in push-pull. Isn't that essentially a mu-follower?


kevinkr:
"I've done this with 6SN7/7N7 where an MQ EXO-001 choke provided the inductance (100H, 900 ohm DCR) This ends up working very much like a mu-follower without the additional caps and resistors being required..."

In the mu-follower, load current only flows in the top triode (the CF section).

Michael



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