EL34 SE triode mode A class sch wanted

[trancy]

hello...

I was searching around for good and simple sch for triode mode el34 amp, but I am not satisfied with that that i found.
Maybe you guys have something for me?

thanks

trens

 

[plovati]

from l'Audhiophile

http://www.audiofanatic.it/Schemi/Tipo/Valvole/finali/pic_finali_SE/EL34SE_12AX7.jpg

I can send You the full article. Cheap good sounding amplifier.

 

[trancy]

thanks....but this is tetrode way....please, send me if you can...also PSU...I¨d like to see PSU too....tube type if its possible

 

[Bas Horneman]

but I am not satisfied with that that i found

What have you found? And why weren't you satisfied? That will help us help you...otherwize we may go posting all the schematics that you don't approve of!

 

[trancy]

I agree,
...actualy, I need as less part as possible , with 6sn7 input and simpliest OTL, PSU with tube....and triode mode


thanks

 

[Bas Horneman]

Have you seen my schematic? You could substitute the 6n1p with your 6SN7.

http://basenjes.de/tubes/jbsel34.htm

 

[plovati]

thanks....but this is tetrode way....please, send me if you can...also PSU...I¨d like to see PSU too....tube type if its possible

Look again. EL34 is triode strapped. Power supply is tube (5U4). No 6SN7. if You are able to do that can try to design your own driver stage or whole amply otherwise You've to accept what community has.

The whole schematic are somewhere over internet, search Michel Leluaux EL3. I have the full article if You are really going to built it.

 

[trancy]

Have you seen my schematic? You could substitute the 6n1p with your 6SN7.

http://basenjes.de/tubes/jbsel34.htm

yes i saw it, but c4s bothers me....

 

[Bas Horneman]

but c4s bothers me....

Ah ok...just replace with a 22-68k resistor! Aim for around 200-225 volt on the plate...and adjust cathode resistor so that around 8mA runs trough 6sn7. et voila.

 

[Geek]

Here's another

http://www.tubes.mynetcologne.de/roehren/el34set/el34set_e.html

 

[Tubes4e4]

Hi Trens,

I was searching around for good and simple sch for triode mode el34 amp

Here´s an example.

Loosely based on a JELabs design, it really sings and was not expensive to build.

Tom

 

[jaymanaa]

Re: Re: EL34 SE triode mode A class sch wanted

Hi Trens,



Here´s an example.

Loosely based on a JELabs design, it really sings and was not expensive to build.

Tom

Hey, Thinking about building this. Has anyone here tried (or heard it). I'm thinking maybe some custom wound OPT's. I don't quite understand the high B+ and high OPT input resistance. Could someone explain it in simple terms, as I am just learning to read plate curves. Also any overall opinions on the design would be welcome. Thanks Jay

 

[BHD]

Here's another:

http://www.angela.com/catalog/how-to/SE.EL34.html

And a parallel SE design:

http://www.one-electron.com/amps.html

 

[jaymanaa]

Hmmm, That one electron design is interesting. I allready have a PT, (salvaged) but it doesn't look like it has enough heater current. In its original application it was running 4.56 amps worth of heaters. The one electron design would call for 8 amps. Tom's circuit calls for 4.2. I might add this is my first DIY amp, so I'm trying to use stuff I have laying around here in the man cave. Also Tom's circuit looks a little simpler for a first timer, I just don't understand the high 10K load he has the tube working into, or the seemingly high B+. I've had some help doing load lines, but am having trouble deciphering exactly what they are telling me. I guess I could just build it, but I would kind of like to understand the effects of the 10K Z. Thinking of doing the power supply like this.

 

[Empee]

different input stages ?

Hi all,


I thought better to revive this old thread instead of opening a new one, as I already found numerous SE EL34 designs....

However, I keep finding two different input stages,
as illustrated in enclosed attachement.

Wich one is "better", soundwise ?
I'm aiming at the best possible fidelity.

Driver tube will be a 12AT7 (ecc81)


oh and as a learning experience,
can you also explain why ?


Cheers,

Empee