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keantoken 18th February 2014 04:22 AM


Originally Posted by RCruz (
Can we avoid the input cap ?

If you use batteries or an isolated power supply, yes. But I'd like to know exactly what kind of power supply and situation you have before I create a bunch of useless schematics.

keantoken 18th February 2014 04:33 AM


Originally Posted by danielwritesbac (
For historical references only, here is the older version of Kuartlotron that doesn't use the inductor.
I have a model that is older than that and it still outperforms a chip. :D
Post #26 has an easy way to build the inductor for the new model.

Yes, I eventually chose the inductor because it did not cause distortion or impair sonic focus. I actually posted that old schematic by accident, because I thought it was the Kuartlotron's fault that Joachim's setup was ringing. Actually it was the output cable resonating in it's series mode, causing that telltale cusped rising square wave edge.

The Kuartlotron may be fine without the inductor as long as you have the 47R output resistor, which is basically what Dan's using.

dadod 18th February 2014 05:28 AM


Originally Posted by keantoken (

LTSpice does funny things if you use the M suffix.

In LTspice use MEG for M(megaohm).

Zero D 18th February 2014 12:16 PM

HF Booster
2 Attachment(s)
I tried various Caps in the following position, & the 1nf boosted the HF -3dB up to over 1GHz ! THD was still below 0.001% @ 20kHz with 1V RMS :)

Whether this would be stable etc in Reality ? Even if it's OTT for audio, it "might" be a useful technique for video ? ;)

RCruz 18th February 2014 01:27 PM

Thank you Daniel.

I am planning to use the Kuartlotron just after a jfet common source high gain amp stage.

It outputs 10v DC offset modulated by signal.

Maybe I can build the stock buffer with simetrical psu (so I will loose output cap) but would like to increase it's input impedance to 1mega so I can use a small cap in the input.

RCruz 18th February 2014 01:43 PM


Originally Posted by Martina Schoener (
Attachment 400501Hallo Joachim, hallo Keantoken

just give you a picture of my working place and a "certain " :D:D
buffer in it
The sound has a level of undisturbed, clear information, that is only mached by the very best line stages I came accross in my "Audio Life"
the "musical correctness" in tonality, dynamics, punch, details, focus and imaging is just striking! - in my system the height matters and now, with the newer version its there and also 3D is there ( soundsources/instruments are placed before, behind, above and in between my speakers)
and when this happens a lot of things went into the right direction...
( I use a ZDL 5 way, time correct, and " almost" phase linear speaker as my main monitor and played this weekend with the Kiso speakers - which created a lot of fun - actually real "Joy")

Thanks for your work ....
and my "Amplifier" thanks you too, as it loves being provided with signals from such a wonderful source

Attachment 400501

hi Martina

Do you use the buffer just to drive long cables ?

Joachim Gerhard 18th February 2014 01:50 PM

Her system is so high gain that we use the buffer as the line stage.
There is a 10kOhm TKD pot before that regulates the volume.
Actually we made several buffer shoutouts that way.
That included the Piglets Dad, the Hawsford, the Calvin, the Paradise and another buffer designed by me.
I study buffers since many years because i found they have a profund impact on the sound also from the technical data that should not be the case.

Joachim Gerhard 18th February 2014 05:22 PM

1 Attachment(s)
Here is a better picture of the buffer with volume control i have build.

Salas 18th February 2014 07:19 PM

Kean, congratulations for your "philosophical buffer" circuit.

RCruz 18th February 2014 07:22 PM

philosophical ?

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