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OTL2014 develop at begin of 2014
The main characteristics are:
This design is inspired to these design:
The purpose is always to drive the final valves with two drivers with equal reference ground to configure both final valves as cathode follower.
If we compare this circuit with the Futterman here the advantage is to have a driver that amplifies but here the disadvantage is the necessity to require a large value capacitor on the signal path (see C7 = 47uF).
In this case, I did not built this amplifier from scratch,
I modified an existing one with some limits and problems.
It use the 6336A output tubes but also the 6c33c-b coudl be used without problems.
The following version is less perfect but it obtain the same result.
The output capacitor protect the loudspeakers but to eliminate a little bump on switch-on and switch-off use a loudspeaker protection with delay.