chinsettawong

Are those DIY headphones?

Happy birthday, Kerry!

Received the boards. Thanks.

I don't have good experience with those red resistors. On my DIY T2, I had to take a lot of them out. Your noise could very well come from those.

What was the actual cause of the problem?

I bought a pair of these headphones because I really wanted to see how good they could be and to support this new comer. My experience is pretty much similar to Birgir's. I like the build quality. The clamping force on the head isn't that much, which is a good thing. However, it can be a bit too loose. The headphones almost fell out of my head a few times. About the sound, they sound very similar to my Omega clone. I might be a bit bias, but my Omega clone has just a bit better bass extension. Overall, I would say that the phones are very nicely built. The headband can use some improvement. The price, IMO, is a bit pricey putting it in a similar price range as the Stax SR007.

Thank you guys!

Happy birthday!!

Sent. Thanks!

Don't worry too much about the offset 20-30V voltage. It will not hurt your headphones at all.

Dear Michael, Please add one more main board for me. So, the new total is 4 main boards. The rest are correct. Many thanks. Wachara C.

I would like to add for 2 partially assembled GRHVXXX boards, please.

Are you referring to me?

Bare boards for me.

Preassembled boards will be nice.

A Raspberry Pi + Hifi-berry DAC + Volumio could be a good choice.

Interesting! Thanks for sharing.

Inside the Stax SRD unit, there are a pair of step up transformers for audio signal and a step up voltage circuit for the bias voltage. The audio signal needs to be amplified a lot for it to be played on the electrostatic headphones. Many of electrostatic amps can swing the audio signal to over +/- 400V. The bias voltage for electrostatic headphones also needs to be stepped up from the main AC voltage. For Stax headphones, the bias voltage is 580V. So, the amplified audio signal together with this bias voltage of 580V can actually be more than 1KV.

Happy birthday!

Happy birthday!

You guys make me want to go back to play with my CNC again. I haven't touched It for almost 2 years.

Happy birthday!!!

Could it possibly be this kind of JFet?

Happy birthday!

Make sure that you let me know when you come again next time. Let’s have a beer together.