What point are you trying to make?

That an inductor-loaded class-A amplifier is a viable circuit.

This circuit has nothing to do with the original one under discussion?

The original circuit was meant to be an inductor-loaded class-A amp, presumably derived from Nelson Pass's "Zen" series, with a few errors introduced.

 

That an inductor-loaded class-A amplifier is a viable circuit.


The original circuit was meant to be an inductor-loaded class-A amp, presumably derived from Nelson Pass's "Zen" series, with a few errors introduced.

Thanks for the clarification. You have definitely shown an inductor loaded class A amplifier is viable.

 

Thanks for the clarification. You have definitely shown an inductor loaded class A amplifier is viable.

I might even build one. I've got some large chokes of somewhere near the right value (from thyristor battery chargers).

 

How about just making it into a Bridge-Amp,
and eliminating all that Bias through the Speaker ?

Any one who thinks they need a Class-A Amp deserves what ever they get.
But I guess they're required if You want real "Musicality" and "Sound-Stage".
.
.
.

 

But I guess they're required if You want real "Musicality" and "Sound-Stage".

and real heat output!

How about just making it into a Bridge-Amp,
and eliminating all that Bias through the Speaker ?

That would require two chokes, and capacitors are cheaper than chokes.

 

T

You found a useless audio power amplifier circuit.
The coils cut high audio frequencies.

I changed its transistor and base resistor value for a higher output power.
I simulated it to show that the output power is 1.8W with severe distortion.
The speaker and transistor each heat with 4.5W all the time even when not playing sounds.
The DC in the speaker causes its cone to be pulled over to one side causing more distortion.
The input impedance is less than only 2 ohms.

Thank you

SPICE simulations don't mean anything for those people to whom Baranek's law applies!
I got my facts wrong - the silver bullet kills a werewolf, not a vampire. View attachment 246461View attachment 246462

Here's what you can do if you add a handful of small signal transistors. (If you insist that a handful means five then the BCV61 is a dual.) MY version of Spice doesn't have the 2SC5200 so I substituted an MJL3281A.
Spice predicts 0.02% for the distortion, mainly 2nd harmonic.
0.3Ω is the DC resistance of the choke. The bias sets about 500mV across the choke resistance to give a standing current of 1.8A.

Thank you.