⭕ BOB CARVER DYNACO MARK VI TUBE AMP, KT-120 OUTPUT TUBES, FULLY REDESIGNED


Ive had this amplifier for a long time, and it is almost new. No more than 30 minutes of listening, until now. Ive completely redesigned and rebuilt it.


I have extensively redesigned this Dyna amplifier using everything I know.

I raised it from a poor and simple split load driver driving 8417 output tubes, to a high voltage system driving a dual pair of modern KT120s.

What I did I will outline here. After I outline all the changes and redesigns, Ill explain the purpose of each and every change made.

I changed the output stage from the Devil begotten ultra-linear configuration to pure pentode operation. (Stu Hegemans expression).

I increased the power supply energy storage five-fold.

I changed the output tubes to the Tung-Sol KT120s.

I modified the screen - grid circuit with a current limiter.

I substantially changed the open - loop feedback compensation.

I changed the time constant of the output tube grid dive such that the volt-time product impressed on the control grid of the output stage is ALWAYS lower than the saturation limit associated with the output transformer.

I modified the feedback in order to increase the performance when driving a loudspeaker, especially when used with a high resolution loudspeaker. It was here I voiced it to yield a large soundstage, and with pinpoint imaging inside that soundstage.