[drubrew]

I think I have made about 15+ adapters since the limited production. I will send out an email to all of those folks. I think I made about 10 previous to that over the past few years. Interesting that this has not been discovered until now. Please spread the word so we can get these adapters fixed. We will add the resistor free of charge.

 

[GoRedwings19]

Quote:

Originally Posted by PATB Is this problem specific to the Stax amps or to the Gilmore designs as well? I have listened critically to the HE90 using a headamp KGSS and did not notice this channel imbalance. I would have easily noticed this as I am easily distracted by channel imbalance or what not. I am also curious as to why Eric343 seems to be surprised by this development. Eric343 (and bozebuttons (Ayt999 and NeilPeart with the KGBH)), haven't you been critically listening to the KGSS/HE90 combo for quite some time now?

Patb>You raise a good point.

But the above headfiers have used the he90's prior to this batch and thus have reported no problems about this.

Which leads me to think that maybe this new batch is made differently. I am not saying they sub standard to previous he90's, it just seems strange that this problem has only come to light now with the new batch.

Any thoughts on this?

 

[bozebuttons]

I have noticed a slight imbalance sometimes with the KGSS & the Stax007t before using my first HE90s,I usually would adjust the volume control 1 more notch on the right volume knob more then the left & the balance issue was gone,since the KGSS & 007t have seperate volume controls for each channel & never thought about it again till recently.
I contacted Justin ,He supplied me with the info & pics to adjust the Bias on the KGSS,I have to give it a try & see what happens.

 

[GoRedwings19]

Quote:

Originally Posted by bozebuttons I have noticed a slight imbalance sometimes with the KGSS & the Stax007t before using my first HE90s,I usually would adjust the volume control 1 more notch on the right volume knob more then the left & the balance issue was gone,since the KGSS & 007t have seperate volume controls for each channel & never thought about it again till recently. I contacted Justin ,He supplied me with the info & pics to adjust the Bias on the KGSS,I have to give it a try & see what happens.

Thanks for clearing this up mr fuzzybuttons.

I wonder if there is a similar procedure with diagrams for the the headfiers using the 007t.

 

[dannyandelyse]

Thanks drew..............

You are a gentleman

Dan

 

[agile_one]

Quote:

Originally Posted by dannyandelyse Thanks drew.............. You are a gentleman Dan

Seconded ...

 

[mikeg]

I've read in a previous thread that Wmcmanus' HE90 sounded better when driven by an HEV90, than when driven by several other non-Sennheiser amps. Although, if I recall correctly, no imbalance was mentioned, its diminished performance with other amps may be significant. And, Wmcmanus' HE90 is not of recent vintage.

Quote:

Originally Posted by GoRedwings19 Patb>You raise a good point. But the above headfiers have used the he90's prior to this batch and thus have reported no problems about this. Which leads me to think that maybe this new batch is made differently. I am not saying they sub standard to previous he90's, it just seems strange that this problem has only come to light now with the new batch. Any thoughts on this?

 

[Hirsch]

Quote:

Originally Posted by GoRedwings19 I wonder if there is a similar procedure with diagrams for the the headfiers using the 007t.

There is not, as the bias voltage on the 007t cannot be changed without a modification to the amp. However, it may not matter, since the resistor in series with the bias voltage may be more critical than the voltage itself.

 

[Wmcmanus]

Quote:

Originally Posted by dannyandelyse Thanks drew.............. You are a gentleman Dan

Thirded!

I've briefly used the HE90's with the Egmont Signature amp (and the Senn to Stax adapter cable that Drew made for me), and didn't notice any channel imbalance. The HE90's mate so well with the HEV90's that I've pretty much just gone with that system, and don't mix and match very often. Yet, it is still reassuring to know that I can send my adapter cable back in for a quick upgrade/repair.

This raises another question! What about using the Omega II's with the HEV90 (and the Stax to Senn adapter cable)? Will this adapter cable need to be modified as well?

 

[mikeg]

Is it known, at this point, which modifications are best, and whether degradation of electrostat headphone performance results?

Quote:

Originally Posted by Wmcmanus This raises another question! What about using the Omega II's with the HEV90 (and the Stax to Senn adapter cable)? Will this adapter cable need to be modified as well?

 

[eric343]

Quote:

Originally Posted by Wmcmanus This raises another question! What about using the Omega II's with the HEV90 (and the Stax to Senn adapter cable)? Will this adapter cable need to be modified as well?

No.
The O2 will be running under-biased, which will definitely not damage it but may make it perform a little sub-par.

In my brief listening since I turned down the bias on my KGSS, I have not heard any difference in the sound of the O2.

 

[gurus]

I received an Egmont from Rudistor Systems just last week.

http://www.rudistor.com/soundsystems/electrost.htm

I was a bit concerned after reading the above thread as I have both adapters- one for the Omega's and one for the HE60 built into the amp. So , I emailed Rudi and he tells me that The Egmont amp has 540V for the HE60 adapter and 580V for the Stax. Obviously, someone did his homework before building the amp.

And thanks Rudi, the amp sounds wonderful!

 

[immtbiker]

The Egmont with adjustable bias for Senns is 1700 Euro. Anyone know what that converts to in $US?

 

[Nik]

Quote:

Originally Posted by immtbiker The Egmont with adjustable bias for Senns is 1700 Euro. Anyone know what that converts to in $US?

2043 US$

http://www.xe.com/

Best!
Nicola

 

[jimbobuk]

No one's really answered whether HE60s are safe out of Stax amps 580v ?! I realise this is mostly about HE90s, but i (and my HE60s permanently connected to my stax srm-313 amp) would really like to be sure that everything is ok!!

Thanks