chinsettawong

Wow! Those look really big! You can probably fit the PS and the amp in just one box. Wachara C.

Wow, that looks great. Congratulations!

To my ears, HE60 is no comaparison to even the Stax SR202 and I prefer SR007 to SR009.

Wow! One project after another. There is no way that I can catch up. Wachara C.

Congratulations, Andy! Wachara C.

I haven't replaced the o-ring yet. Yes, it was broken, but I glue it back using super glue. Well, I wouldn't say that HE60 sounds like crap. They are just not as pleasant to listen to as compared to the other bigger phones.

Please allow me to add a few pictures of my T2. And these are a few headphones that I have tested with T2 so far. What can I say? T2 has so much power. It loves big headphones. With T2, HE60 sounds like a child toy when compared to SR009, Omega or even my own DIY phones.

Nice front panel!

Congratulations!

I just want to reconfirm Andy's solution of solving the noise issue. I've changed out all the PRP resistors in the active batteries and replaced them with 1% Royal resistors (Thai brand). After that is done, there is no more noise. The amp is dead quite. The voltages from all active batteries are very stable, and it is very easy to adjust the output +/- voltages to be close to 0. Wachara C.

Hi Blubliss, I use PRP resistors and I also have noise problem. I'll try to change all the resistors in the active battery and see if I can get all the noise out. Thanks a lot for your info. Wachara C.

It's actually is IXCP10m90s instead of ixys10m90s.

Wow! What a nice idea.

What's that?

Can you take some photos? Maybe we can guide you step by step. Wachara C.

Hi Spritzer, The diaphragm side that is facing the ear is the only side that is being energized, and if any dust goes in between, it will cause unwanted noise. It is therefore very crucial to have a good protection. However the back side of the driver isn't that critical. I don't put any protection layer on the back side of my drivers, and I actually like it better that way. Wachara C.

Yes, my friend has given them to me for free. They also come with the Hev70 which, sadly, isn't working. I'll try to fix it later. Well, he isn't a DIYer and didn't have any other amp to try on and he thought that the amp and the headphones were all broken. He actually wanted me to take them apart to study the inside. The drivers come with a protective plastic sheet on the side facing the ear. The other side is protected using some kinds of very fine cloth - maybe silkscreen cloth. They did a good job protecting the dust. When I opened up the drivers, they were very clean. Talking about the sound, they sure sound pretty good to my ears. The bass impact isn't as good as Stax 407, but it's not too far off. Frankly speaking, I feel that my headphones sound very similar to HE60 with a bit better bass. By the way, Stax 407 is more sensitive than HE 60. The difference in spacer thickness of 0.15 mm sure makes a lot of difference. Wachara C.

A pair of HE60 was given to me by a Thai friend. The phones must have been in storage for a long time as the vinyl on the ear pads come flaky off. So, I have to disassemble and clean the interior. Taking this opportunity, I take a few pictures. The diaphragm to stator distance is around 0.5 mm. There is nothing special on the stator surface. Wachara C.

Very nice! More pictures please.

I just love to see your rebuild. Keep more photos coming. Wachara C.

The English document is here: http://www.savebase.com/InfoBase/downloads/tmp/DY294_EN_V4b.pdf

You can download an English version of the instruction from one of the sellers.

Well, I won't be using the ones I bought from Ebay. Just from the look, they are not that reliable anyway. Wachara C.

I used it as what suggested by Kevin. I shorted gate with source and plug into the tester. Drain went into collector hole and source in emitter. I set the voltage to 1000V and pushed test button. The number stayed at around 230V. Wachara C.

I've got the tester and tested 2sk216 that I bought from Pacific-semi and Ebay. They both measured at 230V. I'm quite sure that the ones I got from Pacific-semi are real, but the ones from Ebay looked fake. However, they tested OK too. What's going on? Wachara C.