Amplifier ultralinear used 6P3S

[Giovanni]

Salutations; greetings to all i am new i introduce myself john;

I wanted to write about my realization about a dual mono amplifier with separate power supplies for each channel, all designed and built by me, given the posts and the debates about the 6P3S valve, I thought I'd post the measurements myself. obtained;

Number of valves 4 6P3S for each channel, in parallel push pull
maximum output power about 20Watt

6j5 wa tube preamplifier (perfectly silent) 6N7 phase splitter pilot inverter so it looks like a small final power stage able to correctly driver the four 6P3S !!

Power supply for preamplifier and splitter with the help of inductors and then CLC cells

 

anode voltage about 331volts

G2 voltage about 336 volts (10 ohm resistors  for two tube for current limitation !!)

ultralinear configuration or distributed load if that's better !!

automatic bias with resistors 680 ohm for each single cathode and 47 microFarad bypass capacitor per cathode

voltage for each cathode about 27.6 volts

total harmonic distortion THD 1Khz  in closed loop (and max power 20 Watt) 0.1%

output transformer with anode anode load of 6600ohm

secondary 4 ~ 8 ~ 16ohm, feedback on the output at 16ohm

15kohm feedback resistor with 66picofarad capacitor in parallel

6 amp 3.15volt ~ 0 ~ 3.15 volt power transformer
anodic from 270V ~ 0 ~ 270V 220milliamper
silicon rectifier with 2 BY255 full wave and 155 microfarad level capacitor

ground Bus wire line!! 90 DB signal to noise ratio

damping factor better than 5

 

I opened this topic because I didn't know how to reply to the upload computer topic, as it is closed. The simulators are excellent only if you enter the correct parameters. Greetings Giovanni Giacomo Pisanu, technical designer repairer, pulsed lights, laser hair removal, lcd tv repairer, machines for industrial production, and oriental laser collaborator technician.

 

the output transformers were made by Piemme Elektra in Peschiera Italy by the designer Maurizio Parlione  Bye!!

Editat August 18, 2021 de Giovanni

[Giovanni]

NB * I started with tubes when I was 9 years old, now I design and build hi-fi power amplifiers in all technologies, obviously I design electronic modules for machine control and modifications to be put into production with the consent of the design engineers and therefore designed especially for my work. I am not a graduate but I am the one who gives you the practice and knowledge of years, so I calculate, design, create and put into production !! For the audio field I have always had a great passion since I was a child !! Thank you all!!

[Mircea]

Can you post the schematics, please?

 

What is the purpose of your posting, do you want to sell your amplifiers? 

 

What is the meaning of NB? 

[d2134]

Acum 11 minute, Mircea a spus:

What is the meaning of NB? 

nota bene

 (ˈnəʊtə ˈbiːnɪ)

note well; take note. Abbreviation: NB, N.B., nb or n.b.

[Elison]

NB means Nota bene.

[Giovanni]

48 minutes ago, Mircea said:

Can you post the schematics, please?

 

What is the purpose of your posting, do you want to sell your amplifiers? 

 

What is the meaning of NB? 

Hello, welcome everyone, I'm glad; guys, I will try to post the various schemes, subject to the time available, then I will make a film of the complete system. I can guarantee it feels like a bomb !! As for the sales I make on request, but I did not enter the forum as a reseller, I replied to an old topic in your forum, entitled computer charge, where they were slaughtering themselves with simulations, in the end the moderator asked for official evidence and I I posted them !! We feel later now I'm busy, I will still be happy to post with you, thank you all and happy holidays for those who do!

[Giovanni]

this is the schematic link of my final push pull best regards 

 

https://ibb.co/1YVBdwZ

[Mircea]

 

Any more data about the OT? 

 

Frequency response? 

Editat August 20, 2021 de Mircea

[merck]

@Giovanni A G1 resistor of 6P3S is missing in the schematics. Below you have the datasheet: 

 

[Giovanni]

Greetings; I remind everyone that this amplifier works like this for about four years nothing ever happened !! Greetings

21 minutes ago, merck said:

@Giovanni A G1 resistor of 6P3S is missing in the schematics. Below you have the datasheet: 

 

keep in mind that I have known tubes since I was 9 years old, I have repaired tube TVs for years I have made and will make tube amps as long as I can, so the nameplate data is not really the real one !!

[Mircea]

Got it, experience beats the theory and so on... Seen that already. Logging out! 

[Giovanni]

25 minutes ago, merck said:

@Giovanni A G1 resistor of 6P3S is missing in the schematics. Below you have the datasheet: 

 

they can write whatever they want, they can even say they hold 20 volts or ten thousand volts, but until I make and test an amplifier, I never say anything !! In addition to the fact that I trust my instruments, I also trust the time that speaks, in addition to my experience !! Thank you all

27 minutes ago, Mircea said:

 

Any more data about the OT? 

 

Frequency response? 

30hz 1db 50khz3db it responds very well both at the bottom and at the top, indeed on the low frequencies I have a few more watts !!

[Giovanni]

31 minutes ago, yo8tot said:

I believe that the grid of V6 floating. Is this ok?

I only added the 390k resistors on the g1 of the finals, if you notice other errors write double check, I repeat I have little time to follow the forum thanks to all! look at the correct diagram

Just now, Giovanni said:

I only added the 390k resistors on the g1 of the finals, if you notice other errors write double check, I repeat I have little time to follow the forum thanks to all! look at the correct diagram

https://ibb.co/pQ74DZs

[merck]

You wiped the resistor from the cathode of the V6:

 

 

[Giovanni]

3 minutes ago, merck said:

You wiped the resistor from the cathode of the V6:

 

 

I modified this amplifier only in the final section, before it was like this scheme, which is about 20 years old and is my project and only my personal idea

 

https://ibb.co/bK0DxBc