The Kuartlotron - keantoken's simple error-correction superbuffer

[Project16]

Nice work!
Can you share the pcb and schematic for psu?
Can you share the pcb for buffer?

Hop! 🙂

 

[thimios]

Hop! 🙂

Many many thanks!

 

[jls001]

@Keantoken: I have a doubt about Vbe(Q4) and Veb(Q3). One left channel I measured Veb(Q4) = 0.6649, Veb(Q3) = 0.6017. So after calculating it becomes 60.0632. Similarly right channel is 60.0673. Is this the calculated value for R1 (=R2)?

 

[keantoken]

Yes, that is correct. Notice that is just a 7% difference from the original value of 56.

 

[jls001]

Thanks!

I did the usual checks and adjustments (0.012 - 0.014 mV DC offset). This time there is absolutely no hum or hiss. I'll need some burn in as I'm experimenting with a thicker solid core internal wiring (20 gauge, Teflon insulation).

 

[ammel68]

Hop! 🙂

Project, can you share the Sprint-Layout file for this power supply?

What style or brand of transformer fits on the board?

Thanks...

 

[Project16]

Hello ammel68!

I used this transformer.
https://www.reichelt.de/Transformer...33&ARTICLE=2483&START=0&SORT=artnr&OFFSET=500

For the sprint layout file is importing gerber because originally the layout has been designed with DesignSpark.

 

[ammel68]

Hello Project16,

Thank you for the zip file!

I'll have to search around and see if I can find a suitable transformer from Mouser or some other seller over here.

 

[thimios]

Another software based test.

 

[keantoken]

Can you list the exact parts you used? Is this before trimming?

 

[Project16]

With a friend we used the kuartlotron after RIAA corrector (D.Self) and before the entry line as it found that the sound lacked a little safe and well although Kuartlotron is not provided for here he corrected this issue.

 

[udailey]

Could you please reword that last bit? Im confused about what you meant.

 

[Project16]

Could you please reword that last bit? Im confused about what you meant.

For a friend I made an RIAA equalizer with a beautiful sound but lacked a little "punch" (a little too flat). So we tried the Kuartlotron between the RIAA corrector and line input preamplifier and immediately the sound gained dynamics.

I hope this is clear (online translation) 😀

 

[udailey]

Yes, perfect. Thank you.

 

[thimios]

Can you list the exact parts you used? Is this before trimming?

Is this for me?
Look all transistors bc550c,bc560c by fairchild.
Farther test using Right Mark audio analyzer

 

[thimios]

Using ARTA

 

[keantoken]

Not a bad result. Can you tell which harmonics are from the soundcard and which are from the Kuartlotron?

 

[thimios]

Not a bad result. Can you tell which harmonics are from the soundcard and which are from the Kuartlotron?

I can post a sound card loop test.
Here .With ARTA & with SpectraLab

 

[sarathssca]

Hi ,

Can we run this buffer using +/-6 or +/-7v power supply? will it impact its performance?

 

[keantoken]

It will reduce the clipping voltage, and you will want to trim R5 to get TP at half the rails. Generally performance decreases with lower voltage, but it probably won't be too bad.