"Diamond" tube preamp with 12au7

[Gost22]

Hi all!
Does anyone is interested in a complete schematic for the tube preamplifier with 12ax7 (ecc83) for very good real audiophile tube sound?
cheers!

Hi guys!
Here the full schematic (Figure-1) for tube buffer "DIAMOND" with ECC88 (6DJ8 or 6922)
Excellent tube buffer for yours CD player or DVD player!
Enjoy,.... and cheers!

 

[Gost22]

Hello!
R4=22k/2W !! R*=470R; LED= red (5mm),
EnjoyS with very,...very good tube sound!
Love,.... Santa Ana
cheers!

 

[kevinkr]

Voltage doubler caps C15/C16 voltage rating seems insufficient at 63V. I estimate you have as much as 68V across each one at nominal line, 100V caps would provide some margin.

 

[Gost22]

Voltage doubler caps C15/C16 voltage rating seems insufficient at 63V. I estimate you have as much as 68V across each one at nominal line, 100V caps would provide some margin.

Two el.capacitors in series (if one is 63V) is then obtained 126V!
It's OK C15 and C16 to be 100V!
thank you!

 

[kevinkr]

And across those capacitors under a light load you could have as much as 136V (depending on transformer winding dcr it could be a bit more or less) at a nominal line voltage of 230V.

Have you actually measured the voltage across those caps?

 

[Gost22]

And across those capacitors under a light load you could have as much as 136V (depending on transformer winding dcr it could be a bit more or less) at a nominal line voltage of 230V.

Have you actually measured the voltage across those caps?

Voltage across those caps is 132,8V (Voltage across one caps 66,4V!)
Sekundar DC-Voltage Us=48x1,41 = 67,68V

 

[kevinkr]

Easily fixed!

 

[Gost22]

Big thanks to mr Ben (00940) for bestowed suggestion!
This tube buffer is a much better on the tube buffer Musical Fidelity X-10D ??!
cheers!

 

[M Gregg]

Discharge resistors are missing on the PSU.


Regards
M. Gregg