F6 Amplifier

[kiven chen]

30KHz

 

[kiven chen]

continue

 

[kiven chen]

50K

 

[kiven chen]

60K

 

[kiven chen]

70K

 

[kiven chen]

80K

 

[kiven chen]

90K

 

[kiven chen]

100K

 

[kiven chen]

200K

 

[kiven chen]

300K

 

[kiven chen]

60KHz has begun to decay,

 

[generg]

Hi kiven chen,

Thanks for the pictures, I will do tomorrow the same and just for fun look if I get similar results.

Can you influence the K2 to k3 ratio by changing the transconductance values of your semiconductors?

Is a nice play and allows to trim to dark or less dark sound.

 

[kiven chen]

sorry
I don't know what you mean "influence the K2 to K3 ratio".

 

[generg]

I mean something like this...

F6 left and right channel, 1W/8R

 

[kiven chen]

Do you mean, harmonic distortion? I don't have the condition, nor does this.
2 times the frequency,3 times the frequency?

 

[buzzforb]

Generg. Is the mismatch intentional, to listen to different spectra?

 

[kiven chen]

I mean something like this...

F6 left and right channel, 1W/8R

Using “FET Analyzer” to test it? Where can I download?

 

[generg]

You only need a laptop or a PC where the sound card is capable doing 48kHz and 24 bit.

There are many free programs for Windows, ARTA, Audio Analyser and so on.

You only have to care that the 2.8V/8Ohm for 1Watt are reduced let us say to 280mV not to overload the sound card input. But there are many hints in the net...

Electronic Equiptment - DIY soundcard scope probe

ARTA Home



Visual Analyser 2011 XE

 

[generg]

Generg. Is the mismatch intentional, to listen to different spectra?

No it was only intended to show that even SS with very close Vgs show in one case k2 in the other k3 dominance.
But it is easy to correct this when you have the pictures. Choosing different transconductance parts or fitting source resistors at the out or input.

 

[kiven chen]

Read an article today, seem to say.
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