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Re: schematics for 6C33 single ended OTL?

217.208.161.78

The output impedance of a cathode follower is approximately Rp/1+u. A 6C33C with u of ~2.3 then gives 80/3.3 ~ 24 ohm so 2 in parallell give ~12 ohm.

Note that the plate resitance and Gm varies with current so 80ohm is only valid for currents around 500mA, for higher currents Gm increases and Rp decrease. I run 6C33C at peak currents of 2.5A and at this current Rp is substantially lower, about 40ohms.

Regards Hans

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