Dx hybrid amplifier will be produced soon

As requested - distortion profile from simulator. I likes it 🙂
 

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Sorry to disappoint you folks....i am moved by curiosity

And now a days i am curious about digital amplifiers.

I hope curiosity to tubes comes next.

Also i do appreciate to create stuff myself... when you point me some schematic if loose a lot of energy.😱

It is alike to stay in a bar, or restaurant...and then you are open to flirt...then someone say...

- Can you see that girl over there?.... i do think she is nice...i do think she is pretty.... i do think i gonna be happy with here...so...you go to flirt with her😱.

My young age was plenty of tubes all around...TVs, audio equipment...all them had tubes. one of my first amplifier was tube... also Radio Frequency transmitters...the first stuff i have repaired was a tube control to elevators...not that curiosity to tubes now a days..but this is cyclic and i am sick for electronics...the passion may return one day.

My Class D is strange...and this drives me on.... sounds good and sounds bad at same time... bass you listen depending where you are.... it is powerful and it is weak... it looks too much strange... and waveform we can go shaping it...this is interesting to see the effects...have something that is driving my curiosity...for sure i do think Class AB is much better in sonics.... and that explains why this was around since the sixties (or before) and never really took off.

regards,

Carlos
 

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. . . had you tested or build such amp...

Not as posted, I'm building a 6922 hybrid with latfet output. The circuit on post #52 is meant to preserve authentic DX output stage but needs tweaks for output offset adjustment and probably a DC servo. I actually hope that expert folks at TGM lab will proceed with the DX authorized hybrid development. It is very difficult to find a good FET for input nowadays. I think triodes are still plentiful enough as an alternative for a continuing development of good sounding amplifier.

. . . T4 might be replaced by a BJT (higher transconductance and not static sensitive)

Yes, as you already know, Rod Coleman successfully used 2N5401 and MPSA92 in the "Shunt Cascode Power Valve Driver" and the "does the 3A5 have the stones to drive a 2A3?" thread. But base current related distortion will tend to dominate total distortion as discussed in "My folded-cascode VAS linearity investigation" thread. One solution is to use high gain transistor, but another is to use FETs.

. . . Put a capacitor across R22, the quality of the voltage at the gate/base of T4 is very important, it needs to be as clean as possible as any noise here will be heard.

Yes, the quality of the psu is very important, a very clean HV supply is a definite must. However, if power is not clean enough, a cap across R22 will exacerbate hum problem because input of T4 is referenced to V+.

The attached circuit is what i am playing with, in no way finalized. I am still tweaking the PSU. Any comments, suggestions, and other alternatives are welcome. However, since the circuit is in no way resembles a DX Amp, this is OT. I hope Carlos does not take this as an offense.
 

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