Zenquito Variants - SK170 SJ74 ...drive 2SK1058

[Jay]

Power

 

[Jay]

FFT

 

[Jay]

Circuit with lowered FB (1K5 --> 1K)

 

[Jay]

4 Ohm Load

.step v=0.1
Fourier components of I(load)
DC component:0.00209143

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 5.255e-01 1.000e+00 179.95° 0.00°
2 2.000e+03 1.699e-06 3.234e-06 -59.38° -239.33°
3 3.000e+03 1.653e-06 3.146e-06 -164.20° -344.15°
4 4.000e+03 2.950e-08 5.614e-08 127.67° -52.28°
5 5.000e+03 5.070e-09 9.648e-09 32.13° -147.82°
6 6.000e+03 1.617e-09 3.076e-09 -46.44° -226.39°
7 7.000e+03 5.125e-09 9.752e-09 -167.10° -347.05°
8 8.000e+03 1.405e-09 2.674e-09 165.79° -14.16°
9 9.000e+03 1.529e-09 2.910e-09 127.66° -52.29°
Total Harmonic Distortion: 0.000451%


.step v=0.2
Fourier components of I(load)
DC component:0.00209661

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 1.051e+00 1.000e+00 179.95° 0.00°
2 2.000e+03 7.998e-06 7.610e-06 -61.23° -241.17°
3 3.000e+03 1.368e-05 1.302e-05 -163.95° -343.90°
4 4.000e+03 5.048e-07 4.803e-07 123.93° -56.01°
5 5.000e+03 1.407e-07 1.338e-07 43.15° -136.80°
6 6.000e+03 7.572e-09 7.204e-09 -152.10° -332.05°
7 7.000e+03 2.739e-08 2.606e-08 141.93° -38.02°
8 8.000e+03 3.074e-08 2.925e-08 153.75° -26.20°
9 9.000e+03 3.103e-08 2.953e-08 169.71° -10.24°
Total Harmonic Distortion: 0.001509%

.step v=0.3
Fourier components of I(load)
DC component:0.00210889

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 1.576e+00 1.000e+00 179.95° 0.00°
2 2.000e+03 2.385e-05 1.513e-05 -63.79° -243.74°
3 3.000e+03 4.934e-05 3.130e-05 -163.37° -343.32°
4 4.000e+03 3.152e-06 2.000e-06 123.13° -56.82°
5 5.000e+03 1.421e-06 9.015e-07 36.04° -143.90°
6 6.000e+03 2.775e-07 1.760e-07 -39.57° -219.52°
7 7.000e+03 6.317e-08 4.007e-08 -128.53° -308.48°
8 8.000e+03 2.624e-08 1.664e-08 54.84° -125.11°
9 9.000e+03 5.611e-08 3.560e-08 20.43° -159.52°
Total Harmonic Distortion: 0.003484%

.step v=0.4
Fourier components of I(load)
DC component:0.00213859

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 2.102e+00 1.000e+00 179.95° 0.00°
2 2.000e+03 6.526e-05 3.105e-05 -66.72° -246.67°
3 3.000e+03 1.328e-04 6.317e-05 -162.49° -342.43°
4 4.000e+03 1.546e-05 7.354e-06 122.72° -57.23°
5 5.000e+03 8.834e-06 4.203e-06 36.55° -143.40°
6 6.000e+03 2.742e-06 1.305e-06 -47.67° -227.62°
7 7.000e+03 1.321e-06 6.284e-07 -133.84° -313.79°
8 8.000e+03 5.245e-07 2.496e-07 140.01° -39.94°
9 9.000e+03 2.405e-07 1.144e-07 52.39° -127.56°
Total Harmonic Distortion: 0.007091%

.step v=0.5
Fourier components of I(load)
DC component:0.00223931

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 2.627e+00 1.000e+00 179.95° 0.00°
2 2.000e+03 2.252e-04 8.573e-05 -69.99° -249.94°
3 3.000e+03 3.607e-04 1.373e-04 -160.62° -340.57°
4 4.000e+03 9.882e-05 3.762e-05 121.75° -58.19°
5 5.000e+03 7.144e-05 2.720e-05 36.55° -143.40°
6 6.000e+03 3.972e-05 1.512e-05 -48.53° -228.48°
7 7.000e+03 2.646e-05 1.007e-05 -134.96° -314.90°
8 8.000e+03 1.600e-05 6.091e-06 138.92° -41.02°
9 9.000e+03 9.390e-06 3.575e-06 52.06° -127.89°
Total Harmonic Distortion: 0.016953%

.step v=0.6
Fourier components of I(load)
DC component:0.00247288

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 3.151e+00 1.000e+00 179.95° 0.00°
2 2.000e+03 5.742e-04 1.822e-04 -71.21° -251.16°
3 3.000e+03 7.870e-04 2.498e-04 -159.75° -339.69°
4 4.000e+03 2.086e-04 6.620e-05 121.63° -58.32°
5 5.000e+03 1.086e-04 3.447e-05 35.71° -144.24°
6 6.000e+03 1.049e-05 3.330e-06 133.91° -46.03°
7 7.000e+03 4.609e-05 1.463e-05 46.80° -133.14°
8 8.000e+03 6.014e-05 1.908e-05 -40.87° -220.81°
9 9.000e+03 4.438e-05 1.408e-05 -128.30° -308.25°
Total Harmonic Distortion: 0.031928%

.step v=0.7
Fourier components of I(load)
DC component:0.00268754

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 3.676e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 8.153e-04 2.218e-04 -71.30° -251.24°
3 3.000e+03 1.248e-03 3.396e-04 -160.23° -340.17°
4 4.000e+03 1.308e-04 3.559e-05 122.31° -57.63°
5 5.000e+03 4.436e-05 1.207e-05 28.48° -151.46°
6 6.000e+03 1.533e-04 4.171e-05 130.22° -49.72°
7 7.000e+03 1.065e-04 2.898e-05 43.79° -136.16°
8 8.000e+03 5.703e-05 1.552e-05 -46.49° -226.43°
9 9.000e+03 1.100e-05 2.992e-06 71.04° -108.90°
Total Harmonic Distortion: 0.041083%

.step v=0.8
Fourier components of I(load)
DC component:0.00286002

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 4.200e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 9.516e-04 2.266e-04 -70.82° -250.76°
3 3.000e+03 1.702e-03 4.053e-04 -160.79° -340.73°
4 4.000e+03 1.046e-05 2.491e-06 -108.15° -288.09°
5 5.000e+03 9.987e-05 2.378e-05 -141.21° -321.15°
6 6.000e+03 2.029e-04 4.831e-05 129.92° -50.02°
7 7.000e+03 1.411e-04 3.359e-05 42.37° -137.57°
8 8.000e+03 5.819e-05 1.386e-05 139.91° -40.03°
9 9.000e+03 6.337e-05 1.509e-05 50.74° -129.21°
Total Harmonic Distortion: 0.046912%

.step v=0.9
Fourier components of I(load)
DC component:0.003011

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 4.723e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 1.047e-03 2.217e-04 -70.28° -250.22°
3 3.000e+03 2.120e-03 4.488e-04 -161.51° -341.45°
4 4.000e+03 1.265e-04 2.678e-05 -63.45° -243.39°
5 5.000e+03 2.839e-04 6.010e-05 -143.72° -323.66°
6 6.000e+03 1.741e-04 3.685e-05 129.82° -50.12°
7 7.000e+03 1.162e-04 2.460e-05 40.53° -139.41°
8 8.000e+03 1.461e-04 3.093e-05 137.27° -42.67°
9 9.000e+03 1.209e-04 2.560e-05 47.81° -132.13°
Total Harmonic Distortion: 0.050844%

.step v=1
Fourier components of I(load)
DC component:0.00314454

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 5.247e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 1.118e-03 2.130e-04 -69.56° -249.50°
3 3.000e+03 2.529e-03 4.820e-04 -162.31° -342.25°
4 4.000e+03 2.288e-04 4.360e-05 -60.86° -240.80°
5 5.000e+03 4.641e-04 8.845e-05 -144.08° -324.02°
6 6.000e+03 1.182e-04 2.253e-05 129.67° -50.27°
7 7.000e+03 3.498e-05 6.666e-06 28.27° -151.67°
8 8.000e+03 1.816e-04 3.461e-05 136.65° -43.29°
9 9.000e+03 1.505e-04 2.868e-05 46.46° -133.48°
Total Harmonic Distortion: 0.053848%

.step v=1.1
Fourier components of I(load)
DC component:0.00326251

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 5.771e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 1.163e-03 2.015e-04 -68.89° -248.83°
3 3.000e+03 2.954e-03 5.119e-04 -163.14° -343.08°
4 4.000e+03 3.178e-04 5.508e-05 -60.11° -240.05°
5 5.000e+03 6.166e-04 1.069e-04 -144.32° -324.26°
6 6.000e+03 5.514e-05 9.555e-06 130.25° -49.69°
7 7.000e+03 7.744e-05 1.342e-05 -129.41° -309.35°
8 8.000e+03 1.755e-04 3.041e-05 136.25° -43.69°
9 9.000e+03 1.359e-04 2.356e-05 45.63° -134.31°
Total Harmonic Distortion: 0.056467%

.step v=1.2
Fourier components of I(load)
DC component:0.00336403

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 6.294e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 1.184e-03 1.881e-04 -68.00° -247.94°
3 3.000e+03 3.421e-03 5.435e-04 -163.96° -343.90°
4 4.000e+03 4.024e-04 6.394e-05 -59.42° -239.36°
5 5.000e+03 7.380e-04 1.173e-04 -144.41° -324.35°
6 6.000e+03 7.976e-06 1.267e-06 -66.54° -246.48°
7 7.000e+03 1.977e-04 3.141e-05 -132.91° -312.85°
8 8.000e+03 1.478e-04 2.349e-05 136.78° -43.15°
9 9.000e+03 8.521e-05 1.354e-05 41.41° -138.52°
Total Harmonic Distortion: 0.059191%

.step v=1.3
Fourier components of I(load)
DC component:0.00344281

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 6.817e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 1.180e-03 1.732e-04 -67.23° -247.17°
3 3.000e+03 3.955e-03 5.802e-04 -164.70° -344.64°
4 4.000e+03 4.807e-04 7.051e-05 -59.44° -239.38°
5 5.000e+03 8.302e-04 1.218e-04 -144.80° -324.74°
6 6.000e+03 5.901e-05 8.656e-06 -52.06° -232.00°
7 7.000e+03 3.122e-04 4.580e-05 -134.75° -314.69°
8 8.000e+03 1.118e-04 1.640e-05 135.70° -44.23°
9 9.000e+03 2.097e-05 3.076e-06 13.24° -166.69°
Total Harmonic Distortion: 0.062357%

.step v=1.4
Fourier components of I(load)
DC component:0.00350012

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 7.340e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 1.144e-03 1.559e-04 -66.23° -246.17°
3 3.000e+03 4.574e-03 6.231e-04 -165.37° -345.31°
4 4.000e+03 5.614e-04 7.648e-05 -59.62° -239.55°
5 5.000e+03 8.971e-04 1.222e-04 -144.98° -324.92°
6 6.000e+03 1.062e-04 1.447e-05 -51.40° -231.34°
7 7.000e+03 4.240e-04 5.776e-05 -134.95° -314.88°
8 8.000e+03 6.870e-05 9.360e-06 134.57° -45.37°
9 9.000e+03 6.422e-05 8.749e-06 -116.69° -296.62°
Total Harmonic Distortion: 0.066113%

.step v=1.5
Fourier components of I(load)
DC component:0.00353011

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 7.862e+00 1.000e+00 179.94° 0.00°
2 2.000e+03 1.075e-03 1.367e-04 -64.46° -244.40°
3 3.000e+03 5.294e-03 6.733e-04 -165.92° -345.85°
4 4.000e+03 6.537e-04 8.315e-05 -59.31° -239.25°
5 5.000e+03 9.314e-04 1.185e-04 -145.54° -325.48°
6 6.000e+03 1.485e-04 1.888e-05 -50.73° -230.67°
7 7.000e+03 5.243e-04 6.669e-05 -135.51° -315.44°
8 8.000e+03 2.725e-05 3.466e-06 139.72° -40.22°
9 9.000e+03 1.478e-04 1.880e-05 -124.67° -304.61°
Total Harmonic Distortion: 0.070582%

.step v=1.6
Fourier components of I(load)
DC component:0.00352755

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 8.384e+00 1.000e+00 179.93° 0.00°
2 2.000e+03 9.557e-04 1.140e-04 -61.96° -241.90°
3 3.000e+03 6.133e-03 7.315e-04 -166.30° -346.23°
4 4.000e+03 7.519e-04 8.968e-05 -59.46° -239.40°
5 5.000e+03 9.304e-04 1.110e-04 -146.06° -325.99°
6 6.000e+03 1.784e-04 2.128e-05 -49.78° -229.72°
7 7.000e+03 6.152e-04 7.337e-05 -135.40° -315.33°
8 8.000e+03 1.653e-05 1.971e-06 -54.76° -234.69°
9 9.000e+03 2.275e-04 2.713e-05 -126.62° -306.55°
Total Harmonic Distortion: 0.075827%

.step v=1.7
Fourier components of I(load)
DC component:0.00347914

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 8.906e+00 1.000e+00 179.93° 0.00°
2 2.000e+03 7.866e-04 8.832e-05 -57.76° -237.69°
3 3.000e+03 7.116e-03 7.990e-04 -166.46° -346.40°
4 4.000e+03 8.699e-04 9.767e-05 -59.99° -239.92°
5 5.000e+03 8.907e-04 1.000e-04 -146.79° -326.72°
6 6.000e+03 1.941e-04 2.179e-05 -48.82° -228.75°
7 7.000e+03 7.043e-04 7.908e-05 -134.93° -314.87°
8 8.000e+03 5.143e-05 5.774e-06 -47.33° -227.26°
9 9.000e+03 3.051e-04 3.425e-05 -128.85° -308.78°
Total Harmonic Distortion: 0.082076%

.step v=1.8
Fourier components of I(load)
DC component:0.00337843

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 9.428e+00 1.000e+00 179.93° 0.00°
2 2.000e+03 5.554e-04 5.892e-05 -47.60° -227.53°
3 3.000e+03 8.284e-03 8.787e-04 -166.46° -346.39°
4 4.000e+03 1.020e-03 1.082e-04 -60.61° -240.55°
5 5.000e+03 8.060e-04 8.550e-05 -149.25° -329.18°
6 6.000e+03 2.004e-04 2.126e-05 -47.34° -227.27°
7 7.000e+03 7.982e-04 8.467e-05 -134.05° -313.98°
8 8.000e+03 8.480e-05 8.995e-06 -45.59° -225.52°
9 9.000e+03 3.715e-04 3.941e-05 -130.07° -310.00°
Total Harmonic Distortion: 0.089656%

.step v=1.9
Fourier components of I(load)
DC component:0.0032105

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 9.949e+00 1.000e+00 179.93° 0.00°
2 2.000e+03 3.182e-04 3.199e-05 -9.04° -188.97°
3 3.000e+03 9.673e-03 9.723e-04 -166.14° -346.07°
4 4.000e+03 1.216e-03 1.223e-04 -61.22° -241.15°
5 5.000e+03 6.527e-04 6.560e-05 -156.64° -336.57°
6 6.000e+03 1.985e-04 1.995e-05 -43.26° -223.19°
7 7.000e+03 9.139e-04 9.187e-05 -132.11° -312.04°
8 8.000e+03 1.180e-04 1.186e-05 -48.00° -227.93°
9 9.000e+03 4.122e-04 4.143e-05 -132.79° -312.72°
Total Harmonic Distortion: 0.098807%

.step v=2
Fourier components of I(load)
DC component:0.00499815

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+03 1.046e+01 1.000e+00 179.93° 0.00°
2 2.000e+03 3.619e-03 3.459e-04 -86.08° -266.01°
3 3.000e+03 1.833e-02 1.752e-03 -170.67° -350.60°
4 4.000e+03 2.703e-03 2.584e-04 75.76° -104.17°
5 5.000e+03 6.477e-03 6.191e-04 1.68° -178.24°
6 6.000e+03 3.824e-03 3.655e-04 -87.29° -267.22°
7 7.000e+03 7.394e-03 7.068e-04 -171.89° -351.82°
8 8.000e+03 3.316e-03 3.170e-04 88.46° -91.47°
9 9.000e+03 5.960e-03 5.697e-04 -0.93° -180.86°
Total Harmonic Distortion: 0.216711%

 

[Jay]

Power 4 Ohm

 

[Jay]

FFT 4 Ohm

 

[Boscoe]

Thanks for that I appreciate it. Sorry if I'm missing something but what is the power all those distortion results from and into what impedance?

 

[Jay]

Thanks for that I appreciate it. Sorry if I'm missing something but what is the power all those distortion results from and into what impedance?

From post#24 they are for 4 Ohm. Before post#24 they are for 8 Ohm.

If you see each FFT chart, there are about 20 superimposed charts. They represent input from 0.1 volt, 0.2 volt, 0.3 volt, until 2.0 volt.

If you look at the power chart (i.e. the 8 Ohm load in the first power chart of post#21, green chart) you can see that 0.1 volt input corresponds to 1W output, 0.6 volt input corresponds to 20W output, 2.0 volt input corresponds to 220W output etc.

 

[Jay]

F5 styled feedback

With F5 style feedback arrangement, e.g 1K5 from output to each source (and grounded source resistors) this amp gives max 33W into 8 Ohm, but the distortion spectrum is much better. Such FFT (attached for input from 0.1 volt to 2 volt) should be better sounding than the original.

EDIT: Max output is probably more than 33W. The 33W was what is given by 2 volt input, a standard CD player output.

 

[Jay]

Output Drive

Sorry, the F5 style circuit lacks drive imo. Even the original is slightly not up to my standard. But many can live with such an amp. Imo, they are not musical enough (I have high standard okay).

 

[Boscoe]

Awesome thanks for your help. I think the distortion looks quite reasonable. I'm getting some boards made of this amplifier I'll measure it in the real world and see how it does with some alfet FETs.

 

[juma]

Sorry, the F5 style circuit lacks drive imo. ...

Not at all if you do it right 😉
http://www.diyaudio.com/forums/pass-labs/162042-f5-meets-buzquito.html

 

[Jay]

Not at all if you do it right 😉

Yes of course 😉 I was referring to the simple mod (on the feedback arrangement) for the circuit posted by Boscoe.

The problem is you need those Toshiba parts in the second stage to drive the laterals properly. Make one with bipolar please (such as MJE350) 🙂

 

[juma]

...The problem is you need those Toshiba parts...

Not a problem at all, they are easy to get - Zhoufang and buzzforb are selling them...