[Fred]

Anybody have a list of exactly what's needed a for a good PIMETA build to drive akg k501 cans from a computer source? I'm having an engineer help me but I have to aquire the parts. Case, caps, the whole bit. -Thanks

 

[individual6891]

Tangent has a parts list on his site for 5 major distributors:

http://www.tangentsoft.net/audio/pimeta/plists.html

and

http://www.tangentsoft.net/audio/pimeta/plint.html

for international DIYers

 

[Fred]

thanks. anybody have recommendations for particular parts to really make k501's perform?

 

[Nisbeth]

OPA627/637 and a gain of around 6 (meaning R4 = 4.7k - 5.6k) works for me

/U.

 

[Fred]

I'm looking for options above what's listed on Tangent's schematic. Are the OPA627/637's about the only thing above and beyond a basic build that I should be considering? The k501's are kind of high imp. and I'm looking to build the best PIMETA I can for around $200. Any other suggestions?

 

[Edwood]

Gain of 5 is just barely enough to power the K1000's FWIW.

Default gain of 11 did not sound good. Was quite a bit of clipping and distortion.

-Ed

 

[Edwood]

Oh, and if you are on a budget, use four 1000uF 25V Panasonic Electrolytics.

And be sure to have at least 18V for power. One 9V ain't gonna cut it. 24V would be better.

-Ed

 

[MisterX]

Quote:

Originally Posted by Edwood Gain of 5 is just barely enough to power the K1000's FWIW. Default gain of 11 did not sound good. Was quite a bit of clipping and distortion. -Ed

It shouldn't be clipping.... what is the PSU?

 

[Edwood]

Elpac wm080

Although, the only one I built with default gain was that "problematic" first build with the fried OPAG.

I changed to gain 5 to make it more suitable for more sensitive cans.

-Ed

 

[MisterX]

That is weird cause the amp shpould be able to swing enough voltage for those cans without clipping when powered from a Elpac.
Do you know what the current draw is?

 

[MisterX]

Quote:

Originally Posted by Fred I'm looking for options above what's listed on Tangent's schematic. Are the OPA627/637's about the only thing above and beyond a basic build that I should be considering? The k501's are kind of high imp. and I'm looking to build the best PIMETA I can for around $200. Any other suggestions?

No input caps, blue velvet, OPA637/627, gain of around 7, double buffers on the gain channels and some good PSU caps should be all it takes.

 

[Fred]

thanks MisterX, that's what I was looking for.