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post #19531 of 24765
Quote:
Originally Posted by Chodi View Post

I have experienced a bit of bad luck. Six hours into the burn in, just playing music through the system while the headphones were sitting on my desk the system died. Suddenly no sound from either driver only static. I shut down the system and disconnected the hp's. I shorted the pins with my finger to discharge the hp's. A few minutes later I reconnected everything and it played music but the left channel was down maybe 10-12db. I used the balance on the volume knob to get it balanced but it required too much movement and the left channel was distorting. I shut it down and came back to it hours later. This time it seemed ok but soon the volume in both channels was reduced and the channel imbalance returned. If I tapped on the left ear speaker I could hear it momentarily get loud for an instant then die. I boxed up the system and I will return it to the dealer today. A very long drive for me to resolve this. I do not have another Stax system to determine if it is the hp's or the amp at fault. I believe this is referred to as infant mortality.

I sympathize, the left channel on my GES is intermittent, not tube or cable related. I'm sending it back and trading up to the WES, though. So it's all good.
post #19532 of 24765

Unfortunately not. They're generally just terrible to deal with.

 

Quote:
Originally Posted by georgep View Post

Not very encouraging if you had to send them a Stax amp under warranty.

 

I take there are no other North American options?

post #19533 of 24765

One less SR-X pro in the world. There was about a 1 cm tear around the rim of the dust cover. I can only guess because of my inexperience but that must have been the reason for why the driver would at times lose some sound pressure then a crackling sucking in sound and then a pop and the driver seemed okay.


Edited by jaycalgary - 9/17/12 at 8:05pm
post #19534 of 24765
Quick question if I may. I finished the recap of my srm1/mk2, fired it up, and nothing exploded. Off to a good start. When I attempted to adjust the pots for offset and balance, I could not get them to move. I mean physically. Is there some kind of locking on these, or are they probably just so old that they are stuck? I was just using a small screwdriver. They will not budge.

Maybe a squirt of deoxit?

I wonder if someone glued them in place with how it's going.
post #19535 of 24765

Just turn the amp off and move the pots with a bit of force.  Stax applied some contact adhesive to them back in the 80's but it is easily broken. 

post #19536 of 24765
Quote:
Originally Posted by spritzer View Post

Just turn the amp off and move the pots with a bit of force.  Stax applied some contact adhesive to them back in the 80's but it is easily broken. 

cool, thats what I was hoping.

post #19537 of 24765

I have a question for the resident Stax experts. Are the balanced inputs on the 006tII truly balanced or will it make no difference between using rca or xlr inputs on that amp. I have a balanced source and I am trying to figure out if it is worth buying a set of balanced xlr cables.

post #19538 of 24765
Quote:
Originally Posted by Chodi View Post

I have a question for the resident Stax experts. Are the balanced inputs on the 006tII truly balanced or will it make no difference between using rca or xlr inputs on that amp. I have a balanced source and I am trying to figure out if it is worth buying a set of balanced xlr cables.

Sometimes balanced sounds better, sometimes not. Actually, on my 007t/ii amp, I find the RCA inputs are better (testing the same type of interconnects in RCA and XLR versions).

This is with 009 phones, and the RCA inputs had a more mellow sound, and sound just right to me.

 

I suggest you buy a pair of used XLRs on audiogon, try them out, and if you don't like it, just resell them for about what you paid for them. You really need to test it to find out, and it's worth the experiment.

No one here can tell you what will happen.

post #19539 of 24765
Quote:
Originally Posted by rgs9200m View Post

Sometimes balanced sounds better, sometimes not. Actually, on my 007t/ii amp, I find the RCA inputs are better (testing the same type of interconnects in RCA and XLR versions).

This is with 009 phones, and the RCA inputs had a more mellow sound, and sound just right to me.

 

I suggest you buy a pair of used XLRs on audiogon, try them out, and if you don't like it, just resell them for about what you paid for them. You really need to test it to find out, and it's worth the experiment.

No one here can tell you what will happen.

I was just wondering if you get the expected 6db gain with the balanced inputs on this amp?

post #19540 of 24765
Quote:
Originally Posted by Keithpgdrb View Post

cool, thats what I was hoping.

Sigh.. I'm sorry, more questions. I can not seem to get a decent offset reading. Balance seems to be ok. But offset number changes, depending on where the probe touches? Something isnt right. Both offset pots are dialed down as far as they go. I either get a reading about 14.3 volts, or a fluctuating number around 200mv. I assume the 14.3 number is probably the correct reading, but I'm hoping it's not, because I can't get it any lower (higher)

Readings are about the same on each side.

Can anyone help me troubleshoot here?
post #19541 of 24765
Whats the going price for a stax sigma pro ? ( ok condition , new pads , replaced cable )
post #19542 of 24765

Stax newbie here! I just picked up a Lambda Pro Signature with an SRD-7 pro-bias mod transformer box / energizer, and will have it next week. smily_headphones1.gif I searched through the thread but it's a bit of a monster at this point. I'm trying to figure out what amp I need to drive these.

 

First, and probably dumbest question: can I drive the transformer box with the speaker taps of my Denon receiver? I know it will sound terrible compared to a proper amp, but I'll definitely want to give these a listen as soon as they get here!

 

Otherwise I'm looking for the best bang-for-buck amp. I'm considering the Passlabs F5 (25W/channel class A) but that seems way overkill. I only need voltage swing, and not power, right? Why couldn't I use something op-amp based like the NwAvGuy O2 headphone amp modded for higher gain? Is there any default recommended pairing for the SRD-7 that I should consider?

post #19543 of 24765
Quote:
Originally Posted by Chodi View Post

I was just wondering if you get the expected 6db gain with the balanced inputs on this amp?

 

You don't get 6db gain whengoing from sigle ended to balanced. The gain is 3db (in general not specific of this amp).

post #19544 of 24765
Quote:
Originally Posted by Keithpgdrb View Post


Sigh.. I'm sorry, more questions. I can not seem to get a decent offset reading. Balance seems to be ok. But offset number changes, depending on where the probe touches? Something isnt right. Both offset pots are dialed down as far as they go. I either get a reading about 14.3 volts, or a fluctuating number around 200mv. I assume the 14.3 number is probably the correct reading, but I'm hoping it's not, because I can't get it any lower (higher)
Readings are about the same on each side.
Can anyone help me troubleshoot here?

 

Have you tried to adjust the offset pot as if it was the balance and vice versa?  Somebody at Stax had this brilliant idea back in the day that it would be funny to do this on some of the PCB's.  Other way is to see what's connected to the pot as the balance pot is in the middle of two identical stages while the offset pot isn't. 

post #19545 of 24765
Quote:
Originally Posted by spritzer View Post

 

Have you tried to adjust the offset pot as if it was the balance and vice versa?  Somebody at Stax had this brilliant idea back in the day that it would be funny to do this on some of the PCB's.  Other way is to see what's connected to the pot as the balance pot is in the middle of two identical stages while the offset pot isn't. 

I forgot about that.  I'll check that out.

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