6sn7 headphone amp for grados

[headphonejunkie]

I am thinking of building a 6sn7 amp but need some ideas. I have no experience with tubes ,Although I have been an electronic tech for over twenty years,so I was hoping to get some opinions on what might work.It will need to be able to drive grados and I really want to use the 6sn7 tube. Any help would be greatly appreciated.

 

[headphonejunkie]

I did not realize this type of configuration was so unpopular. What does singlepower audio do to make their ppx3 6sn7 amp?

 

[sbelyo]

Check this project out:

http://headwize.com/projects/showfil...train1_prj.htm

towards the bottom someone built a 6SN7 variant. With grados you will need a rather large output cap (C1). 100uf metalized poly will give you a corner frequency of about 6.3 Hz

I am building this amp soon is both versions.

 

[headphonejunkie]

Thanks for the input. I saw that project, but wasn't sure how to build that last circuit. I am going to need to look into circuit design a little more before I attempt this.thanks.

 

[dsavitsk]

How about this circuit.

It will sound better with grados than the above circuit, and will cost about $60 to build (+ the PS). The power supply from the above suggested project should work fine. R1 and C1 will need to be determined from the datasheets. Also, for a boost in performance, you could tie the bottom end of C1 to B+ (search for ultrapath) and use a big asc oil cap, but this will require a higher quality PS to eliminate noise.

-d

 

[sbelyo]

That's nice and simple. I like that one

 

[headphonejunkie]

That is a nice little circuit. Wouldn't an OTL design produce better sound though? Does anyone know where to get the schematic for the 6sn7 amp in the previous headwize forum? The Eduard Orvisky amp.

 

[dsavitsk]

Quote:

Originally Posted by headphonejunkie That is a nice little circuit. Wouldn't an OTL design produce better sound though?

Not to my ear. I'd rather use a transformer than another tube, a cap in the signal path, and some other method of I/V any day.

 

[headphonejunkie]

I have had no experience with the sounds of these circuits. So, it is totally new to me. I guess that is what happens when you grow up after the tube generation.

 

[Excalibur]

Eduard Orvisky's Audio Page can be found here:

http://www.geocities.com/oviktor/aud9.html

It looks like he removed the schematic though. I'll try to post it here.

 

[Excalibur]

Go here for the schematic:

http://pg.photos.yahoo.com/ph/aliwag.../ph//my_photos

 

[Tomo]

Hey,

Have you checked out HeadWize? You might want to check out their ENTIRE library. It saves your time waiting for our answers ...

http://headwize.com/projects/showfil...ciuff4_prj.htm

Now I am done annoying you. Here is a OTL Headphone Amp using 6SN7 variants.

http://headwize.com/projects/showfil...arbour_prj.htm

Notice that it is meant for high impedance headphones. Too bad eh? But you can parallel more tubes to achieve low impedance. But I am against Para-ing tubes since it very difficult and expensive to collect matched tubes (getting a pair is easy, but getting a set of 4 or more would be difficult or expensive).

Personally, I think dsavitsk's design or Andrea's amp is better idea.

Tomo

P.S. OTL is rather overrated. After all tube sounds are distorted by definition. Going OTL and skipping tranny will do very little to reduce distortion. Nonetheless, many people think otherwise. So do not get discouraged. You will find Andrea has done a whole series of OTL stuff in HeadWize Library.

 

[headphonejunkie]

Thanks for the input. I really want to try a 6sn7 type arrangement. Like I said before I am not up to speed on any tube hardware so I am swayed by what I read. I suppose a transformer arrangement could make for a good first project. Then If I like what I hear , Or not, I can move onto something else.

Thanks

 

[dsavitsk]

Quote:

Originally Posted by headphonejunkie I am swayed by what I read.

Good, read this thread: http://www.diyaudio.com/forums/showt...threadid=30172

 

[ggta]

Quote:

Originally Posted by dsavitsk How about this circuit. It will sound better with grados than the above circuit, and will cost about $60 to build (+ the PS). The power supply from the above suggested project should work fine. R1 and C1 will need to be determined from the datasheets. Also, for a boost in performance, you could tie the bottom end of C1 to B+ (search for ultrapath) and use a big asc oil cap, but this will require a higher quality PS to eliminate noise. -d

Seems very interesting to me. I'd like to build a very low cost amp for a Sennheiser hd600.

I can have a pair of 6SN7. What about R1 and C1's value?