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Anyone heard of the MHPA-FET?

post #1 of 10
Thread Starter 
Recently I stumbled into photos of this portable amp. It's called the MHPA-FET. Has anyone else heard about it? It seems to be popular with Japanese head-fiers and I only see it on Japanese sites when I google it.

Here is a picture from http://f.hatena.ne.jp/web123/20090830154717:



And another one:

post #2 of 10
The top picture (correct link here) has the title: Modded MHPA-FET with Active GND. Looks like some kind of low-powered FET amp (I presume the bottom box in the second pictures contains batteries) where the owner has neatly built and installed a third channel through which the ground is wired. The construction pictures are here. The original kit is available from here for about $50.
post #3 of 10
What is that below the amp? Is it the battery?
post #4 of 10
Thread Starter 
Yeah I think the second box, the one below the amp houses the batteries. Hmm thanks currawong! Interesting little amp. Have you seen/listened to it before?
post #5 of 10
First time I've ever seen it is in this thread.
post #6 of 10
Quote:
Originally Posted by Currawong View Post
First time I've ever seen it is in this thread.
Well, you have the geographic proximity
post #7 of 10
It looks like a nice amp especially with the added active ground channel.
post #8 of 10
looks OK, though all those trimpots suggest either an unfinished or underdeveloped circuit, or possible lack of parts matching/ temperature stability. could also just be to enable the use of a variety of user-selected opamps I guess

great photography though!!
post #9 of 10
MHPA-FET is famous in Japan as desktop amp kit rather than portable. FYI they (Linkman/Marutsu) produced a smaller headphone amp kit named LHPA-DIA_BUFFER-KIT here.
post #10 of 10
I just happened to think about the Neco amp
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