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The Stax Thread III - Page 100

post #1486 of 3295

Any news on the rumored new Stax top amp?


Edited by ardilla - 2/7/14 at 3:47pm
post #1487 of 3295
Quote:
Originally Posted by 3X0 View Post

Haven't you and your friend experienced no problems in your respective ownerships of them?

Yeah I've been told it's started gather channel imbalance with the left side being bit louder. His got a KGSSHV wired up with 2 mono pots for each channel so it's all fine.
Quote:
Originally Posted by NoPants View Post

You should note that ristar's build is modded for more current or something to that effect. If you use the standard values in the mini psu all you have to do is omit the 2n3904 transistors (deregulate the supply). There's no need to offboard the psu in this case. You can also run the amplifier at -/+400V for less heat. 


Thanks for that I'll sus the diy sections again on the other site.
My current issue is I need a custom wound trafo for the the PSU for the old KGSSHV that has 230v primary, any good non expensive recommendations for places? Sumr runs a bit expensive for me.
post #1488 of 3295
Quote:
Originally Posted by DefQon View Post


Yeah I've been told it's started gather channel imbalance with the left side being bit louder. His got a KGSSHV wired up with 2 mono pots for each channel so it's all fine.
Thanks for that I'll sus the diy sections again on the other site.
My current issue is I need a custom wound trafo for the the PSU for the old KGSSHV that has 230v primary, any good non expensive recommendations for places? Sumr runs a bit expensive for me.

http://www.edcorusa.com/p/681/xpwr084 , I haven't found a good solution to 450V without a lot of extraneous stuff. Min current requirements are 200ma. I've used this spec at 450 with a SumR part with no issue.

 

You can use any old 15V transformer for the input section, it's only there to drive the front-end CCS. Antek for the filament transformers yields good results, completely silent and no need for regulation.

post #1489 of 3295

I'll keep Edcor in mind, I'm planning to do the 500v version for the PSU for my offboard. 

 

Quoting the Trafo spec requirements from Lilknights website:

 

Quote:
 Power transformer specs: Pri: 110v/220v. Sec: 2x 450v/130mA, 16v-0-16v/500mA

I'm thinking separate trafo one that is primary 230v and secondary 2x450v as rated above and then hook up a few 230v/15v toroidials for the CCS. It says 16 and center-tapped, is 15v still ok? I don't think my left over trafo's are center-tapped with the 0v rail. Unless I'm reading it wrong?

post #1490 of 3295
Quote:
Originally Posted by DefQon View Post
 

I'll keep Edcor in mind, I'm planning to do the 500v version for the PSU for my offboard. 

 

Quoting the Trafo spec requirements from Lilknights website:

 

I'm thinking separate trafo one that is primary 230v and secondary 2x450v as rated above and then hook up a few 230v/15v toroidials for the CCS. It says 16 and center-tapped, is 15v still ok? I don't think my left over trafo's are center-tapped with the 0v rail. Unless I'm reading it wrong?

I was suggesting a transformer for the megatron specifically, I hope you're not thinking of running that at 500V. This is just my opinion but especially for the offboard, there's probably a lot of gains to be had from running 400V and upping the current to something ridiculous at the output stage. Higher voltage only enables louder volumes which you don't end up using anyway.

 

I didn't run into any problems using 15Vac or 16Vac for LV supply. If you have dual secondaries, you can join them for 30V CT, there's only one bridge. It's been mentioned before, but don't go overboard with the current spec for this section. 

post #1491 of 3295
Lol my bad yeah was talking about the KGSSHV but hey you should know MOAR POWAH is better hehe. Oh ok ignore what I said about the center tapped 16v rails it makes more sense now that you've mentioned that you were referring to the Megatron.
post #1492 of 3295
Quote:
Originally Posted by DefQon View Post


Yeah I've been told it's started gather channel imbalance with the left side being bit louder. His got a KGSSHV wired up with 2 mono pots for each channel so it's all fine.
 

 

Oh that really sucks, but that is the risk with old electronics. I think the Omega and MDR-R10 are risky investments judging by their prices and failure rate.

post #1493 of 3295

I think the R10 is even a bigger risk given that biocellulose only last for a certain amount of time and once the driver dies it is impossible to find replacement drivers let alone have them matched as there are so many driver variations with the R10. The value for the R10 has also increased tremendously over the years, once your drivers fail, you end up with an expensive collectors doorstop but at least you can still sell of the shell for few thousand.


Edited by DefQon - 2/7/14 at 5:16pm
post #1494 of 3295
SR-009 also had (has?) the channel imbalance issue with the apparent solution having been shipping them to Japan and back -- allegedly Stax did nothing to the units and temperature changes and such from shipping resolved the issue.

All electrostatics are susceptible to channel imbalance, and if the culprit is a parasitic charge (rather than diaphragm damage and/or dust), the inconvenient remedy is to play them for days/weeks, futz around with the pins to taste, or stow them away for weeks/months until it goes away.

With persistence you can restore the balance on some of the oldest Stax if the drivers are OK.

Too much FUD in this area IMHO. In most cases only the people who have problems would be very vocal about them (however few), yet I haven't heard of a straight-up failure in years. DavidMahler's R10 was the most recent one I'm aware of.
Edited by 3X0 - 2/7/14 at 5:54pm
post #1495 of 3295
The 009 has had issues with imbalance out of the blue but that was years ago and theres a thread dedicated for it.

That was Birgirs advice from his own experience with his stats to continuously play music to rid itself of the parasitic charge but this method has not helped me.

With the helpful suggestion from wachara with a Stax SR3N no sound/imbalance repair, fixing imbalance issues means to recoat the membrane as a last resort, proven to work as I've done it.
post #1496 of 3295
I tried the continuous playback method with limited success as well.

Having to recoat the membrane would lead me to believe that the diaphragm was somehow compromised, and that the imbalance isn't a result of normal parasitic charges.

If undamaged, stowing them away allows the diaphragm to completely lose charge (short of opening them up).

Posts about SR-009 imbalance experiences are as recent as last month. Fortunately, nigh all cases have been temporary but it goes to show that imbalance is the nature of the beast in the stat game.
Edited by 3X0 - 2/7/14 at 6:38pm
post #1497 of 3295

Had SR-009 imbalance experience with my first 009. That was as the sr009 was brand new to the market.

I recognized that the longer i used it, the worse it got, the left did not sound as loud as the right channel and also starts some kind of distortion.

 

Allowing the 009 to rest for a week or so seems to resolve the issue. But just for a short period of time. The failure came back after using the headphone for more than 3 hours and again got worse with continuous playback.

 

I returned the 009 for repair but they couldn't find any failure.

 

Returned it a 2.nd time with a exact description when and how the imbalance occurs and the hint for testing the unit longer than 4 hours.

 

Stax germany send me back a brand-new headphone which didn't  have any imbalance issues from beginning.

This was also my experience with my 007Mk2 which operates flawlessly since i own it.

post #1498 of 3295

I swear man with all the imbalance issues popping up and stuff, why is it always the left hand side? Man it's a conspiracy. I swear. Stax e-stat illumnati NWO. When you get hit with imbalance you get hit on the left side first.

post #1499 of 3295

One week isn't sufficient in my experience. It can take months to fully discharge the diaphragms and confidently vanquish parasitic charges for the long haul.

 

I've seen and experience the opposite, with the right side being the quieter one -- probably because I'm on the imperial system. Must be a US thing.

post #1500 of 3295

It's a damn conspiracy I tell ya.

 

Humidity has the biggest play with e-sat/ESL imbalance issues. 

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