12au7 - irf510 headphone amp

[tangmonster]

I was in the mood for a project (waiting for Metalgrapho to deliver punched and bent metal for my ksa50 build) so I tried this VERY simple hybrid headphone amp.



based on this project:

http://www.diyaudioprojects.com/Solid/Tube-Mosfet-Hybrid-Headphone-Amp/


I run a stereo set plus tube heater off one lm317 set at 12.6V

The positive edge starts clipping around 1.5V(tested on oscilloscope) but it all sounds great!

Next experiment will be to up the tube voltage a bit.

[Shonver]

(waiting for Metalgrapho to deliver punched and bent metal for my ksa50 build)

Dewd! What does a thing like this cost?

[tangmonster]

Hi shonver

The ksa 50 build or the metal enclosure?

[Shonver]

The enclosure.

[GearSlave]

Custom bending and cutting is no longer the painfull, expensive excersize it used to be. Most of the guys have CNC cutters and benders. As long as the source drawings make sense there's very little human involvement.

[tangmonster]

OH I have done all my enclosures at either Technipunch or Metalgrapho.

MEtalgrapho charges R250 for setup charges
technipunch charges R150 for setup charges

anodising makes things very expensive since the anodizers have a basic charge. For the BPA300 (300 Watt amplifier i built for my subwoofer) i had two natural anodized enclosures made and the total cost including  setup charges where just over 1k

The brushed 430 stainless steel enclosure for the tube phono amplfier i also had two made but since SS doesn't need costly anidozing it was only around R600 for 2 sets.

For my 5 channel lm3886 surround amplifier you can see the 5 small boxes and also one big power supply enclosure. also around the 1k mark all together.

I do use both of these through the company I work for.

Here are a few of my older projects that they cut and bent metal for me:

http://www.facebook.com/album.php?aid=300492&id=607902362&l=2f0fe740d3

http://www.facebook.com/album.php?aid=235530&id=607902362&l=3f5515cb06

http://www.facebook.com/album.php?aid=22780&id=607902362&l=d8bf1ae9f2

http://www.facebook.com/album.php?aid=30914&id=607902362&l=ad99342664


yep , i might be a bit addicted to diy audio....

[tangmonster]

Custom bending and cutting is no longer the painfull, expensive excersize it used to be. Most of the guys have CNC cutters and benders. As long as the source drawings make sense there's very little human involvement.

yeah , i tought myself autocad very quickly which seem to work great.

The trick come with the bending angles.


but back on the thread.

Has anyone ever built this type of headphone amp before?

[tangmonster]

Well , it's been a while but here is the progress.

[tangmonster]

[chipwelder]

Looks really nice!

[tangmonster]

Thanks
It's standing on it's side in that one pic , need to add wood and bottom plate and some feet. I also need to cut down the volume control so that knob is more flush with plate.


Hopefully more complete pics next week. Depends on how much braai's and brandy's I have over the weekend.

[Prince]

Well Done - simple, yet effective!!

[tangmonster]

Thanks!

First one is done , a bit full of fingerprints. But here it is! using it daily now . Need to build the other 2 still.

[Family_Dog]

Very neat! Nothing like the sweet sound of valves


-F_D

[alternativeroute]

Wow that looks excellent!!!

need to add wood and bottom plate and some feet.

You still gonna add the wood?

First one is done , a bit full of fingerprints. But here it is! using it daily now . Need to build the other 2 still.

Other two?