The Kuartlotron - keantoken's simple error-correction superbuffer

[baswamin]

Hello Keantoken,

I built this buffer (P2P) with capacitance multiplier power supply on left hand side and 2 channels of buffer on the right. It sounds pretty good with most improvement felt in the high frequencies which are reproduced very well. It may be due to my cables causing some reduction in high frequencies. Need to listen more.

Thanks

[Joachim Gerhard]

It is a very good sounding buffer for sure. We just have to sort out that distortion issue at higher amplitudes. I mean for the record. I do not care much about super low distortion anyway. Then an AD797 configured for 0dB gain would be the end of the story. That kind of buffer whould measure the measurement equipment ( Audio Precission ).
For example MBL do it that way.

[keantoken]

I'm glad you like it Baswamin.

[ammel68]

Originally Posted by Joachim Gerhard

Then an AD797 configured for 0dB gain would be the end of the story.

I thought I read somewhere that the AD797 is not easy to implement as a unity gain buffer.

[taisho_daniel]

Hi Joachim. Since you've listened to both, how would you compare this buffer to the Curl/ Borbely style cascoded BF862 buffer you used for the ES9023 filter?

[RCruz]

Originally Posted by Joachim Gerhard

. We just have to sort out that distortion issue at higher amplitudes. I mean for the record. I do not care much about super low distortion anyway.

Would you explain what you mean ?

Does it produce audible distortions with 1v input ?

[Joachim Gerhard]

I can not hear better then 1% 2nd harmonic and 0.1% 3rd.
So, no, it does not sound distorted in any way.
The AD797 can be made as a stable buffer easy.
No, i did not direct compare the Kean to my floating cascode buffer but i compared my buffer to the Calvin. The Calvin has more slam and punsh and has a particular way to sound warm but without loss of detail or resolution.
I compared the Calvin against the Kean. Well., Martina may be able to describe that better.
Ricardo, when you see the distortion measurements we made on the Kean buffer i build ( TKD pot, no distortion trim ) it has minimum distortion at 200mV. Advancing the volume the distortion rises.

[keantoken]

My build gets at most 0.0003% THD at 850mV pk-pk input, which is the max for my soundcard. I think something went wrong with Joachim's build. My build shows extremely low distortion.

[Joachim Gerhard]

Can you show the measurements ?
What is the input impedance of your soundcard ?

[keantoken]

Both channels show the same THD and spectrum, so it may have to do with the pot or the batch of transistors used. I used

I've had a used cable TV splitter sitting on my desk for months, and I had the idea to build a Kuartlotron into it. Then I realized it would double as a video buffer. Lol!

Sounds like a good idea anyways, except I'd have to use coaxial interconnects which would be awkward.