[astrostar59]

Doesn't all the DSP EQ processing mess with the NOS rational of your Audio Note DAC?

I don' think it does. I don't upsample, just send it through as Redbook 44.1.

 

[JimL11]

I've corrected my previous note above.  Although the high voltage PS in all the current Stax amps is unregulated, the front end of my SRM-T1 uses a simple zener regulated supply, but the front end of the SR-007 uses 7815 and 7915 IC regulators, which is a step up from the T1.  Sorry for the error.

 

[ye.]

Is there somewhere a better readable version of the schematics of the SRM T1 (or SRM 006t II) than the one posted here:
 
http://www.head-fi.org/t/223263/the-stax-thread-new/22365#post_9454415
http://gilmore.chem.northwestern.edu/stax_srm-t1.jpg
 
I have e.g. trouble reading the transistor types.

 

[zolkis]

> I have e.g. trouble reading the transistor types.
 
Which ones are you interested in? I can check it for you. I have an SRM-T1 Normal/Pro here that I got modded on the PSU and a handful of parts, but not the transistors.

 

[ye.]

Which ones are you interested in? I can check it for you. I have an SRM-T1 Normal/Pro here that I got modded on the PSU and a handful of parts, but not the transistors.

Thanks. The type of Q1 (the JFETs at the input) would be fine for the moment.
 
Nevertheless a readable schematics would be fine, as I try to find an error (distortion at high levels in one channel) and it would help not having to ask for every component in doubt.

 

[funkforfood]

Hi,
I own an old SRM-3 amplifier that need to be repaired, but i'm unable to find the schematics.
Could someone help me?
Thanks!

 

[Jones Bob]

Hi,
I own an old SRM-3 amplifier that need to be repaired, but i'm unable to find the schematics.
Could someone help me?
Thanks!

Google is your friend.
https://www.google.com/search?q=stax+srm-3+schematic&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari

 

[funkforfood]

I did this search many times, but does not return to me the schematic that I am looking for ...

 

[Hardertaskthinking]

Dear all,
 
Can someone point me to an after-market headphone hard case which the SR009 can fit into?  I still have the original wooden case but it looks too delicate to be used on a day-to-day basis.
 
Thank you

 

[Jones Bob]

I did this search many times, but does not return to me the schematic that I am looking for ...

Seems like the SRM-3 is a rather rare STAX amp. Over on That Other Site, user DefCon seems to have experience working on them. You might try to PM him there.

 

[carbonfet]

  Dear all,
 
Can someone point me to an after-market headphone hard case which the SR009 can fit into?  I still have the original wooden case but it looks too delicate to be used on a day-to-day basis.
 
Thank you

 
A pelican style case with pick & pluck foam should do the job.

 

[yates7592]

Agree, I keep my 009's in a Peli case 24/7.

 

[soren_brix]

  Thanks. The type of Q1 (the JFETs at the input) would be fine for the moment.
 
Nevertheless a readable schematics would be fine, as I try to find an error (distortion at high levels in one channel) and it would help not having to ask for every component in doubt.

probably 2sk389GR
 
have you checked the rails and are the LEDs at top/bottom of the 2.stage lit?

 

[ye.]

have you checked the rails and are the LEDs at top/bottom of the 2.stage lit?

Yes.
 
Below about 80% of the full volume the channel sounds fine. I hear suddenly a distortion, in a sine signal, when it gets above that. The other channel is fine. Swapping headphone, inputs or tubes does not change that.
The only difference  in measurements (in circuit) between the channels, I found up to now, is a different Id/Vgs behavior of Q1 ... so I wanted to look up the specs.

 

[soren_brix]

  Yes.
 
Below about 80% of the full volume the channel sounds fine. I hear suddenly a distortion, in a sine signal, when it gets above that. The other channel is fine. Swapping headphone, inputs or tubes does not change that.
The only difference  in measurements (in circuit) between the channels, I found up to now, is a different Id/Vgs behavior of Q1 ... so I wanted to look up the specs.

whats the DC on the anodes?