eXStata DIY Electrostatic Amp for Intermediate DIYers

[awpagan]

Quote:

Originally Posted by ericj /img/forum/go_quote.gif If gilmore said 280v it was a typo. normal bias are 230v. If your bias is too low, the sensitivity drops and it doesn't sound right. If your bias is too high, there is an increase in sensitivity and an increased risk of damage to the drivers. So i have to recommend staying close to the designed bias voltages.

From here--- HeadWize - Project: Blue Hawaii Hybrid Electrostatic Amplifier for Stax Omega II Headphones by Kevin Gilmore

bottom of page.

"If the bias supply is reduced to 280V, the amplifier will drive all electrostatic headphones. I tried it last night on a pair of SRX's. I never ever heard them sound so good."

And from here--- HeadWize - Project: All-Triode Direct-Drive Amps for Electrostatic and Electret Headphones by Kevin Gilmore

a bit more......
bottom of page
"Biasing the headphone diaphragms: The diaphragm bias network for the AC-coupled amp is shown in figure 5. The AC-coupled amps will work with any electrostatic headphone, if the bias voltage is correctly set. Older Stax units are low-voltage bias (~330V). Most of the newer Stax are high-bias (560V)."


Who's going to tell him??

Typo not only once.
How many people fried their Phones?

 

[runeight]

If you guys will give me the recommended bias voltages for various headphones I'll make a page on the website. Then we won't need to get distracted with old information nor will any of you feel compelled to contact Gilmore regarding possibly incorrect bias voltages.

 

[awpagan]

That's a good idea Alex.

I'd prefer to see manufacturers bias voltages.

 

[Hottuna_]

Quote:

Originally Posted by runeight /img/forum/go_quote.gif Gone.

Oh man, so much for not checking up on head-fi at work... damn....

Thats alright i guess, I am not in too huge a rush, don't have a electrostat headphone yet anyway.

Will jump on the next board run.

 

[Michgelsen]

Common bias voltages:
Stax Normal Bias: 230 V
Stax Pro Bias: 580 V
Sennheiser HE60: 540 V
Sennheiser HE90: 500 V
Koss ESP-950: 600 V
HE Audio Jade: 600 V / 580 V, they even don't know themselves.

 

[runeight]

First cut at the table is done. Send more if these are needed.

 

[luvdunhill]

Guys, I'll be doing one last run of sockets. In the beginning I had a restriction of one per person, and since then I've lifted that. I just have a lot going on and need to direct my free time elsewhere. Plus, this will use up the remaining material, and after this there would be a significant reinvestment in time to do anymore. I think I will have 10 or so left. PM me and we can go from there. Looks like people are enjoying them, which is a success in my book!

 

[pabbi1]

Easily the best Stax jack ever created - gracias, Marc!

Ok, for the more enlightened among us, there is a sleve and a Canadian quad available on eBay.

 

[les_garten]

Quote:

Originally Posted by luvdunhill /img/forum/go_quote.gif Guys, I'll be doing one last run of sockets. In the beginning I had a restriction of one per person, and since then I've lifted that. I just have a lot going on and need to direct my free time elsewhere. Plus, this will use up the remaining material, and after this there would be a significant reinvestment in time to do anymore. I think I will have 10 or so left. PM me and we can go from there. Looks like people are enjoying them, which is a success in my book!

I got my Jack from Marc. True work or Art!

 

[awpagan]

Quote:

Originally Posted by luvdunhill /img/forum/go_quote.gif Guys, I'll be doing one last run of sockets. In the beginning I had a restriction of one per person, and since then I've lifted that. I just have a lot going on and need to direct my free time elsewhere. Plus, this will use up the remaining material, and after this there would be a significant reinvestment in time to do anymore. I think I will have 10 or so left. PM me and we can go from there. Looks like people are enjoying them, which is a success in my book!

PM sent...


Also Alex
A bit of info
Stax Earspeakers Summary

 

[Beefy]

Quote:

Originally Posted by awpagan /img/forum/go_quote.gif Also Alex A bit of info Stax Earspeakers Summary

That page is a blatant copy and paste from Wikipedia. The Wikipedia entries are more up to date as well:

Stax Earspeakers - Wikipedia, the free encyclopedia
List of Stax products - Wikipedia, the free encyclopedia

 

[Keithpgdrb]

Quote:

Originally Posted by luvdunhill /img/forum/go_quote.gif Guys, I'll be doing one last run of sockets. In the beginning I had a restriction of one per person, and since then I've lifted that. I just have a lot going on and need to direct my free time elsewhere. Plus, this will use up the remaining material, and after this there would be a significant reinvestment in time to do anymore. I think I will have 10 or so left. PM me and we can go from there. Looks like people are enjoying them, which is a success in my book!

PM sent as well

 

[sergery]

gggrEAT success!!! I have finally secured a pair of stats to call my own. I need a little time to get used to them before I start making tall claims. Right away I will say that the sound is gorgeous, although I think I need to burn in the lesser used driver a bit to catch it up. Music is creepy, impactfull, precise but still beautiful and musical. more to come.

 

[Keithpgdrb]

would anyone be interested in a thread that featured pictures of the completed exstata builds? a pic thread really. It sounds like a nice idea to me, as we could use it as samples of how people case the amp. I know I'll need that. just an idea, let me know, and maybe I'll start collecting pics from people.

 

[Postal_Blue]

Quote:

Originally Posted by luvdunhill /img/forum/go_quote.gif Guys, I'll be doing one last run of sockets. In the beginning I had a restriction of one per person, and since then I've lifted that. I just have a lot going on and need to direct my free time elsewhere. Plus, this will use up the remaining material, and after this there would be a significant reinvestment in time to do anymore. I think I will have 10 or so left. PM me and we can go from there. Looks like people are enjoying them, which is a success in my book!

PM Sent, Thanks!