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Old 27th July 2010, 01:54 PM   #11
lineup is offline lineup  Sweden
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I ran this amplifier in SPICE.
It is not what we can call HIFI. It is more a great project for fun
The harmonic distortion was several %. Up to like THD 5%

About the maximum Output Watt.
We have only 0.8 Ampere across 15 Ohm resistor.
The load is 15 Ohm in Parallell with 8 Ohm ... gives like 5.2 Ohm
0.8A x 5.2 = 4.17 Vpeak, as mentioned by ilimzn
Output is 2.95 Vrms which makes 1.08 Watt max output, teoretically

To increase output Watt a little bit
I would make the power resistor 10 Ohm, instead of 15
This gives a current of 1.2 Ampere (12V / 10 Ohm)
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Old 27th July 2010, 03:42 PM   #12
ilimzn is offline ilimzn  Croatia
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You can also optimize the DC at the output and get a bit more, perhaps 2W out, and this will also decrease distortion at low levels because of the increase in idle current, but it will increase the rise of distortion with power because of decreasing Vds of the MOSFET (nonlinear input capacitance... the effect will be less if the source is low impedance).
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Old 27th July 2010, 11:17 PM   #13
tubem is offline tubem  Canada
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The original authors comments on this project can be seen at this site.DIY AUDIO PROJECTS - Do-It-Yourself Hi-Fi for Audiophiles My actual test results of this amp will be posted when they are complete. I will say though , it really does boot out big sound for what it is.
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Old 28th July 2010, 02:19 AM   #14
Junm is offline Junm  Philippines
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Hi ILIMZN.....

If I use an 8 ohm load resistor and 8 ohms load speaker and set Vq to 10v will the output power be increased to what value? current is increased 1.75A.
will it be better?
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Old 28th July 2010, 03:11 AM   #15
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This can, too interest in the
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Old 28th July 2010, 10:56 AM   #16
AndrewT is offline AndrewT  Scotland
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much of what is being discussed here is also in the PASS website.

Single ended resistor loaded ClassA amplifiers is where it all starts.
Then one adds CCS loading and moves on to Push Pull. It is all in PASS.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 28th July 2010, 01:40 PM   #17
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If you are hooked already like the rest of us here build the F5 for your next amp.
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Old 28th July 2010, 01:47 PM   #18
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This might be interesting, it wouldn't take too long to try it out.
Attached Images
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Last edited by Melon Head; 28th July 2010 at 01:51 PM.
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Old 28th July 2010, 05:00 PM   #19
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There is so much MAGIC in the single ended zero feedback sound that it is easy to ignore its deficiencies . I would like to see and hear of more projects and experiences in this pursuit . I am a big fan of single ended tube amps . Thank you for sharing your hollow state adventure tubem !!!
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Old 28th July 2010, 05:45 PM   #20
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Referring to your amp, the easiest mod you could try would be replacing the 15Ohm resistor with a constant current source, once you have tried that, replace the constant current source with an Aleph current source.
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