Tube SE amplifier with 6P3S (russian tube)

[danzup]

This is one of my SE amplifier , last build .
Inside an Pioneer Amplifier case .
It is made with 6n2P in srpp follow by a 6P3S final class A tube.
It has a smps power source and a control/selection/volume with shunt control by an atmel atmega16 with IR remote control.
Some big pictures with inside:
http://i40.tinypic.com/ohn6gx.jpg
http://i29.tinypic.com/wrkp4i.jpg
And the schematics are :
amplifier
http://i26.tinypic.com/jp7iwg.jpg
smps power source
http://i29.tinypic.com/mw9zph.jpg

[danzup]

picture of front

[Ty_Bower]

Very nice! I like it! The work appears very professional. From the front it looks like a solid state amplifier from the '80s. How very clever. Do you have any impressions of the switching power supply? There is much talk of them, but most people shy away from actually building that kind of supply.

[danzup]

Originally posted by Ty_Bower
Very nice! I like it! The work appears very professional. From the front it looks like a solid state amplifier from the '80s. How very clever. Do you have any impressions of the switching power supply? There is much talk of them, but most people shy away from actually building that kind of supply.

If the smps is well build and constructed there will be no difference between classic transformer and smps for power source .
I assure you that all people who have listened for this amplifier hear no difference about the sound (I have also the same amplifier duplicated with transformer in the power source so A/B listen easy to implement !)

[piero7]

Very very nice pal!!

[quadtech]

Very nice.
If you consider a group buy for the SMPS (220V mains), do count
me in.
Are the volume control/input selection PCBs single sided?
Do post the schematic/board layouts if possible.

Prasad

[danzup]

Originally posted by quadtech
Very nice.
If you consider a group buy for the SMPS (220V mains), do count
me in.
Are the volume control/input selection PCBs single sided?
Do post the schematic/board layouts if possible.

Prasad

It is hard with group buy , nevertheless if I will some time do such I will count you in !
The volume/selection control are my project and posted on an electronic forum from my country (if you are interested I can give you the link , but you must use the google translate as all info are in romanian language ) .
Now it has double layer pcb for which we have made a group buy on that forum after I released the version 1.0 of this project.
I have in mind to do a thread also on diyaudio for this project in the near future.
For those who want to do by herself the smps here are the bom in txt format (also in romania language ) for those who do not manage to figure what is what , i will deliver a translated to English version of this txt .

[azazello]

Dear friend!
Very nice ampl., but for SRPP - 6N2P U=280 v is very low. Ther is
apr. 100 - 120 v per triod and this is no good condition. Ua must be apr. 200-220 v, and You must use PS 380-400 v./For 6P3S this is good condition/.
Or use double triod 6N1P or 6N23P whith 280 v.
If You have not, I can send You free!

[danzup]

Originally posted by azazello
Dear friend!
Very nice ampl., but for SRPP - 6N2P U=280 v is very low. Ther is
apr. 100 - 120 v per triod and this is no good condition. Ua must be apr. 200-220 v, and You must use PS 380-400 v./For 6P3S this is good condition/.
Or use double triod 6N1P or 6N23P whit 280 v.

Thanks for your info but how I say : the theory is one and the practical is another kind .
If you do this circuit (as in many build by me with this tube ) you will see that the tube is working perfectly and I see from the original datasheet that indeed 6n2p work perfectly with 80 ...90V on anode !
This are the NOS 1966 tube .
Do not trust me on that , build this circuit .
We will discus further after that .
And not ! For 6P3S maximal use for me is 300V !!!!
The amplif in my avatar is with 6P3S PP and also with anodic at 280V look here :
http://i32.tinypic.com/25utg9d.jpg
And no : this tube sound horrible over 300V !
But this is my personal opinion.

[azazello]

http://klausmobile.narod.ru/td/data/_6n2p.GIF
http://frank.pocnet.net/sheets/113/6/6N2P.pdf
80-100 v is not linear mode, but the choice is Yours.
http://klausmobile.narod.ru/td/data/_6p3s.GIF