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The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 25th September 2016, 08:35 PM   #711
keantoken is offline keantoken  United States
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Quote:
Originally Posted by nikosokey View Post
Hi Keantoken
I use ON Semi
I need to make changes for better results?
The Kuartlotron webpage schematic gives instructions for changing resistors to accommodate Vbe. There is also a possibility it could be unstable, but I haven't seen it so far. You may get acceptable results without any changes, although your input transistors will probably be running low bias.
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Old 26th September 2016, 05:27 AM   #712
nikosokey is offline nikosokey  Greece
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Quote:
Originally Posted by keantoken View Post
The Kuartlotron webpage schematic gives instructions for changing resistors to accommodate Vbe. There is also a possibility it could be unstable, but I haven't seen it so far. You may get acceptable results without any changes, although your input transistors will probably be running low bias.
Thanks Kean
i will decrease the R1 nad R2 to 52Ω or 47Ω....and i will readjust the R5 trim ...
When i change the 15pf to mica cap i put 5pf the only available , the sound change for the best ,sound completely clean...now
the 25mv on multimeter are the output from my amplifier Golmund clone 9.2.
with SuperBuffer after my DAC AK4490.
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Last edited by nikosokey; 26th September 2016 at 05:30 AM.
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Old 28th September 2016, 10:43 AM   #713
nikosokey is offline nikosokey  Greece
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Yesterday i had make some tests with Buffer after the dac 4490 Discrete (the Dac has 0.1Ω output impedance) i put on buffer 100ΚΩ without any pot just the buffer
at the high levels volume via foobar understand some correction of THD if that makes any sense.
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Old 28th September 2016, 09:02 PM   #714
jls001 is offline jls001  India
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Quote:
Originally Posted by Destroyer OS. View Post
Um no...

I'm reporting I don't have any harshness because Keantoken noted higher voltage can come across with a harsher sound. I'm only at 12.5v.
I'm currently playing around with a shuntreg kit I assembled and tried a couple of 'non-recommended' voltages to power the Kuart.

+/-14.3V sounds too in-your-face, too forward-sounding for my liking, though it did bring drive, flow and much better retrieval of lower level details. But the airiness for which I so loved the Kuart was lost.

Toning it down to +/-13V restored the earlier laidback presentation (with the LM317/337 PSU), while retaining much of the new-found liveliness, drive, flow, and better resolution, but more importantly, restoring the airiness.

I haven't got down to checking if the transistors are overheating, or if the DC offsets have gone up, but the sound is definitely more likable than before. Unfortunately with my existing transformer 13V is the lowest the shuntreg can provide. I also need to re-do the TP adjustment (of half Vcc).

Last edited by jls001; 28th September 2016 at 09:04 PM.
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Old 28th September 2016, 11:04 PM   #715
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The Kuartlotron - keantoken's simple error-correction superbuffer
Sorry, but without reading back lots of pages, where does one find the boards??

Maybe Keantoken you'd want to put a link into ur sig page that goes to a page that links to the boards, or something along those lines?

I'm interested enough in the circuit to try some out!

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Old 28th September 2016, 11:14 PM   #716
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Just PM him.

This post has all the info you need.
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Old 28th September 2016, 11:20 PM   #717
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The Kuartlotron - keantoken's simple error-correction superbuffer
the link goes to the top of the page? <lost>
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Old 28th September 2016, 11:44 PM   #718
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Give it a second and it should go to the correct post, which is 695, on page 70.
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Old 28th September 2016, 11:48 PM   #719
keantoken is offline keantoken  United States
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Quote:
Originally Posted by jls001 View Post
I'm currently playing around with a shuntreg kit I assembled and tried a couple of 'non-recommended' voltages to power the Kuart.
Higher voltages will increase potential thermal mismatch and possibly cause thermal distortion. Furthermore the bias chain is made for +-10V so if you go much higher you won't be able to dial in TP. If you like the sound at a higher voltage, try deliberately putting TP 2V high or low.
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Old 28th September 2016, 11:50 PM   #720
keantoken is offline keantoken  United States
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Quote:
Originally Posted by bear View Post
the link goes to the top of the page? <lost>
I also put a link in the first post:

The Kuartlotron - keantoken's simple error-correction superbuffer
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