Influence of the delay amplifiers for listening characteristics

[Federmann]

Here is one of my old *experiments*. I find this particular design kind of funny...

The amp would perform very, very well at 100KHz if the LTP had enough current drive for C1.

- keantoken

Perfect post.

Graf is too small for accurate analysis.

It is seen that the output phase is over 10 °, a large shape distortion, the difference between positive and negative half wave, the difference between boarding and descending edge. Lots of local feedback, charging and discharging capacitors the not same current, so lateral tilt. Some of the PNP transistors is too slow because of the wide upper and lower narrow.

I could go, what you can read ...

 

[Troton]

Thank you for your constructive contribution.

Both amps look very similar. But I see a big difference, HQQF gives 1kW, but amp5z only 250W. Judge for yourself which is better.

Btw F., what is the purpose of your asking for any simulated or measured data ("I ask all who can disclose any amplifier. Measured or simulated.") when all you say is that "judge for yourself" above ???
Not to mention your output power comparision which has nothing to do with the thread topic ?
Please let Danhard share your wisdom

 

[Federmann]

to danhard

As I wrote HQQF has twice the output voltage, similar Vdif, larger margin of profit, probably through a worse choice of components will HQQF in its entirety less distortion.

 

[keantoken]

So we want an amp that has less than 5.7 degrees phase shift at 100KHz, and no nonlinearity at that point?

- keantoken

 

[Federmann]

So we want an amp that has less than 5.7 degrees phase shift at 100KHz, and no nonlinearity at that point?

- keantoken

If you admit Vdif approximately 20mV, then yes. Lissaoujuss shapes, many of the design can help.

 

[danhard]

Federmann, simulated HQQF pulse response is
http://volny.cz/danhard/HQQF_pulse.gif
Agree with your results?

 

[Federmann]

When the amplifier in saturation, it is evident his return, how it behaves, how to deal with limitations. Lissajouss tell all need to learn to read.

 

[Federmann]

Federmann, simulated HQQF pulse response is
http://volny.cz/danhard/HQQF_pulse.gif
Agree with your results?

Comparison with amp5z?? Right or wrong, the result is comparable?

 

[danhard]

When the amplifier in saturation, it is evident his return, how it behaves, how to deal with limitations. Lissajouss tell all need to learn to read.

So this could be seen from the picture, but I was just stupid and do not see it ?

 

[Federmann]

So this could be seen from the picture, but I was just stupid and do not see it ?

It is necessary to increase the input voltage. Depth of saturation may vary, also created an interesting picture of how the amplifier from saturation awake.

 

[keantoken]

How about this... Phase shift is 1.3@100KHz. I threw together this one with drive and BW in mind... If the load ever drops below 1 ohm, god help those Toshibas... Same thing if it oscillates. Lord!

Unfortunately it has some issues which place it in the hall of shame, it's not currently a practical design.

- keantoken

 

[danhard]

It was a little different
http://volny.cz/danhard/amp5z_pulse.gif
Sorry, it was one of my first simulation, I did not know what I'm doing, as you say.

 

[Federmann]

to danhard

 

[danhard]

Like this?
http://volny.cz/danhard/amp5z_lim.gif
http://volny.cz/danhard/amp5z_lim_xy.gif
And what I see?

 

[BV]

And what I see?

Strong "sticking" in limitation in post 493, caused by heavy saturation.

 

[Upupa Epops]

It is obvious, VAS probably haven't antisaturation circuit....

 

[Federmann]

Strong "sticking" in limitation in post 493, caused by heavy saturation.

It is obvious, VAS probably haven't antisaturation circuit....

Driver HQQF-55-502D, a large input signal 10V! Large capacity in the overall feedback. Sample inappropriateness overcompensation feedback. Capacity may be neither large nor small.

 

[Federmann]

How about this... Phase shift is 1.3@100KHz. I threw together this one with drive and BW in mind... If the load ever drops below 1 ohm, god help those Toshibas... Same thing if it oscillates. Lord!

Unfortunately it has some issues which place it in the hall of shame, it's not currently a practical design.

- keantoken

Interesting and very quick engagement, large bandwidth, more than 3.5 MHz. What are they doing to end cross-currents of transistors?

 

[Upupa Epops]

Sticking past limitation is caused by heavy saturated VAS transistor, not by large capacity in feedback loop....

 

[godfrey]

PMA and Upupa Epops, I will make Hugo's suggestion an official directive- ... etc

Hooray - at last !!! I've never been so happy to see a cop.

Having just wasted several hours of my life reading through 50 pages of (mostly) insults and sarcasm in order to find the useful content in between, I've gained a little insight and a lot of headache.

Thanks for your patience and perseverance, Mr Federmann.