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DIY portable tube headphone amp?

post #1 of 25
Thread Starter 

Just finished building the Raytheon JAN6418 tube amp kit and fell in love with the tube-y sound. Would just shrink this amp down to make it portable, but the tubes ring like a bell if you knock it. 

Does anyone know if there's a scematic for a amp based around something like a 6111, such as the ALO Audio "The Continental" or a Go-Vibe Porta-tube?

post #2 of 25

Don't know, but I was hoping that at some point, Pete Millett would share his portable Millett Hybrid design with us at some point.  Last time I checked, it was no longer on the market, but I could be wrong about that.  It was most definitely a FOTM for quite some time a couple of years ago.

post #3 of 25
Thread Starter 

If he did that, the 6111's would become extinct as fast as the 19J6's did when he published the schematic for the starving student tongue_smile.gif

post #4 of 25
Thread Starter 

Might buy a Muse portable tube amp and mod the heck out of it. Worst case it's only £60 wasted, and even then I should be able to salvage some parts out of it and a nice case.

http://www.head-fi.org/t/567872/muse-portable-tube-amplifier/15#post_7742310

post #5 of 25
Quote:
Originally Posted by Nixon View Post

Just finished building the Raytheon JAN6418 tube amp kit and fell in love with the tube-y sound. Would just shrink this amp down to make it portable, but the tubes ring like a bell if you knock it. 

Does anyone know if there's a scematic for a amp based around something like a 6111, such as the ALO Audio "The Continental" or a Go-Vibe Porta-tube?


I've spent a week or so researching the same question and I haven't found anything that beats the Oatley kit in the coveted "affordability & size" categories. I'm giving serious thought to taking the schematic and trying to work a p2p build on a strip board or perfboard. The Oatley PCB seems to have alot of open space. I'm thinking that a closer/tighter layout might get it small enough to make it portable.

That would be considerably cheaper than the Chinese made Muse (which may be of questionable build/component quality).

Would a perfboard Oatley be Cmoy small? Nope, but I think I can get closer...
post #6 of 25
Thread Starter 
http://www.head-fi.org/t/453425/tube-headphone-amp-kit-for-25/135#post_6565173

You can get it small enough for a portable amp. Might have issues with microphonics with the tubes unless you damp them really well.
post #7 of 25

Agreed.  I've got some ideas on "heavy duty damping" that I think will work.  I think that part of the microphonics problem may be coming from the PCB to the tube via the tube wires.  I'm considering some sort of workaround...  I'm also considering photo/camera batteries that would take up less space. 

post #8 of 25

You should look up siljosae's (spell check, I cant spell) older work. 

He had a few neat layouts for smallish tube amps. 

post #9 of 25

I think I may have spelled it right! 

Found his gallery:

http://www.headphoneamp.co.kr/ftp/sijosae/Gallery/

 

Nope, I always add an L

Facepalm

post #10 of 25
Quote:
Originally Posted by nikongod View Post

I think I may have spelled it right! 

Found his gallery:

http://www.headphoneamp.co.kr/ftp/sijosae/Gallery/

 

Nope, I always add an L

Facepalm


I ran across those last week when researching... I'd give my left leg for a schematic of some of the 6111 tube based amps!!!  His 6922 designs look like they might have some heat dissipation issues...

 

post #11 of 25
Thread Starter 

Sijosae's amps look amazing. He's posted up some circuits but none of his portable hybrid amps :( 

post #12 of 25
Thread Starter 

Found one that might interest you guys 

http://audiotronics.xanga.com/550800314/item/

H
e was designing one with a 6111 too but the last post was back in 2007.

http://audiotronics.xanga.com/555817524/item/


Edited by Nixon - 3/30/12 at 12:14pm
post #13 of 25
Thread Starter 
post #14 of 25

I've been messing about with the fa shmidt version, the aim being to get it into an altoids tin this is what I have so far

 

P1000205 (Small).JPGP1000206 (Small).JPG

 

Obviously toner transfer

 

P1000208 (Small).JPGP1000210 (Small).JPGP1000211 (Small).JPG

 

P1000217 (Small).JPGP1000219 (Small).JPGP1000215 (Small).JPG

 

Notice the heatsink has changed orientation in the final version, it is just warm to the touch using 12volts so I think it will be fine in a tin

 

I used a 12AU7 and a JRC4556

 

sounds very nice for a simple project

 

If anyone wants the layout to try their own just drop me a PM I use pcbartist (cos its free)

 

cheers

FRED

 

 

post #15 of 25
Thread Starter 

Just ordered a ecc88, a 6111 and 6021 to have a mess around with. Hopefully should be able to knock together the basic YAHA with the ecc88, then shrink it down a bit with the 6111 or 6021 (depending on which sounds nicer). Might replace the LM317 with a more efficient switching regulator to decrease the power draw and hopefully increase the battery life, possible http://www.active-robots.com/anyvolt-dc-dc-converter.html . I'm assuming as the LM317 is used as a tube heater, the noise from it shouldn't be too noticeable. 

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