New complementary V-FET amp: Best from the past ?

[mos57]

Hi everybody,
in the last months i have developed a 50 watt class AB power amp with the employment of complementary Sony V-Fet 2SK82 2SJ28. The input and driver circuit was thought to employ also low voltage power supply. Another my will was to configure the output stage to have also voltage gain, so the result was a topology similar to trans-nova.
Input stage is a folded cascode, driver stage is configured as a simply bjt follower to add up the complementary signals for the power stage. The little caps in the circuit not are much necessary, but in audio test with my friends, seems better with it in.
In reality i have prepared 2 main driver circuit: one with all j fet cascode and another with jfet-bjt cascode.
Distortion measurement tell me that the best was version B (all jfet), but in audio test my friends prefer version A (jfet-bjt). This last has a faster and cheerful sound with more mid-bass and the sound seems more out of speakers.
Version B is preferred if it's necessary to put in evidence especially the high or if you prefer a more relaxed sound.

Francesco.

[housing]

How do they sound? Do you have any pictures showing the amps? I'm curious.

[mos57]

Originally Posted by housing

How do they sound? Do you have any pictures showing the amps? I'm curious.

Hi, at this time i have realized only a prototype.
Here the photos. Sorry, Data of photo machine isn't current time.

Francesco.

[mos57]

Hi people.

I have released a new other version of this amp.

You can see the figure also in my website:AMPLIMOS one stage amplifiers, amplificatori audio monostadio

There are others good schematics.

Francesco

[housing]

It looks great! Is there a substantial amp built or just a single channel prototype?

[mos57]

It is currently only a prototype channel.
In the past, prompt I have made the PCB, but now I devote more time to optimize the schema and components employed, helping with listening sessions, before making the printed circuit boards.

If there is sufficient demand (GB?), I can achieve and provide the amplifers PCB (ver. A, B or C) with all components and also completed with power Vfets.

Francesco