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post #20656 of 24765
Quote:
Originally Posted by pao_revolt View Post


can you give me the dimension? i would like to know if it big enough for my woo double headphone stand.

 

thanks

 

I have that stand and the Stax bag is big enough to go around the whole stand.  It's a tight fit for 2 headphones though, depending on what the 2nd headphone is.

post #20657 of 24765
Quote:
Quote:
Originally Posted by kevin gilmore View Post

Some of the semiconductors are now from manufacturers not based in japan.

for example on the sr-002 portable amplifier, the jfet opamps are AD822A
and the pre-regulator is LTC3127.

I'm new to this thread,

What fet do the other Stax drivers use?

The AD822A is a relatively cheap chip with extramely slow slew rate.

It's not the drivers/earspeakers, but the amplifiers that have the semiconductors.

post #20658 of 24765
Quote:
Originally Posted by wink View Post

It's not the drivers/earspeakers, but the amplifiers that have the semiconductors.

 

Stax refers to its amplifiers as driver units. It calls its headphones earspeakers...

post #20659 of 24765
Quote:
Originally Posted by Maxvla View Post

If you manage to get the diaphragm stuck to the stator you will have to repair it or live with lower quality sound.

 

Ehhh WTF?  If the diaphragm were able to hit the stator (which it can't) then you would have a lot of worries besides lower quality sound...

post #20660 of 24765
Quote:
Originally Posted by spritzer View Post

Ehhh WTF?  If the diaphragm were able to hit the stator (which it can't) then you would have a lot of worries besides lower quality sound...
http://www.head-fi.org/t/588716/vintage-stax-repair-and-maintenance/30
post #20661 of 24765

...and your point is?  This is a well known issue with the normal bias units and has nothing to do with the diaphragm touching anything. 

post #20662 of 24765

I need a little help on some troubleshooting...

 

My SRM-717 has cut out while playing a few times now.  

  • There is no noise, just a sudden drop out in volume.  
  • If I keep the source feeding and push the gain all the way up I can start to hear faint music, but it sounds a bit distorted.
  • The power light is still on.  
  • I tried a few different headphones, no change.  
  • I confirmed that the source is OK, it's playing fine now with an SRM-300.  The only difference would be that I'm feeding the 717 balanced and the 300 unbalanced.

 

This happened a few nights ago. I fired it up to take a quick reading of L- to bias (41 Volts when working and after it cuts out) and found that it was working again.  It failed again in around an hour in the same way.

 

Just looking for some ideas on where to go first/next trouble shooting.  I do hate intermittent faults!

post #20663 of 24765

There is a DC input protection circuit on the 717. Try a different source.

post #20664 of 24765

RE:  covering Stax headphones when not in use

 

The drivers themselves have dust covers internal to the earcup. Dust in your environment can't get into the driver unless the internal dust seals are compromised.  Putting the headphones inside a plastic tent will keep dust off the framework and the leather surfaces, but does nothing useful in terms of the drivers.  They drivers  are already protected from dust when the headphones come from the factory.

 

Without the internal dust seals, the headphones would really never work at all.  Dust would be BOUND to get into the driver, even at the factory.  The drivers are assembled in a clean room, as I understand it; they are built in an essentially dust-free environment and then sealed into their dust shields. 

 

The clearances between stator and diaphragm are so tight that any kind of dust in there would really cause sonic trouble.  Electrostatic headphone drivers have to be sealed behind plastic membranes. 

post #20665 of 24765
Quote:
Originally Posted by kevin gilmore View Post

There is a DC input protection circuit on the 717. Try a different source.

 

Yup, either that or the amps own offset has drifted out of spec.  Too much dust inside the chassis can cause the heat to rise and with it the offset. 

post #20666 of 24765
Quote:
Originally Posted by pao_revolt View Post


can you give me the dimension? i would like to know if it big enough for my woo double headphone stand.

 

thanks


Its a comfortable fit for my Woo Single but I can't see it fitting over the Woo Double.

post #20667 of 24765

My 717 has cut sound two times on very hot summer days, due to overheating. When the amp cools down, it should work again.

On two or three other occasions, inserting the plug from the headphones while the amp was on caused the amp to go into this 'protection mode'. Switching off the amp and disconnecting power for a few seconds, then switching it back on made it work again. This is very rare though. Normally when I disconnect or connect headphones while the amp is on, nothing happens.

I have read reports of 717s overheating due to being configured for the wrong voltage. For example the amp could be set for 220 volt when the line voltage is actually 230 volt, in which case it's better to set the amp for 240 volt operation.

Can any of these points be the source of your problem?

 

Quote:
Originally Posted by shipsupt View Post

I need a little help on some troubleshooting...

 

My SRM-717 has cut out while playing a few times now.  

  • There is no noise, just a sudden drop out in volume.  
  • If I keep the source feeding and push the gain all the way up I can start to hear faint music, but it sounds a bit distorted.
  • The power light is still on.  
  • I tried a few different headphones, no change.  
  • I confirmed that the source is OK, it's playing fine now with an SRM-300.  The only difference would be that I'm feeding the 717 balanced and the 300 unbalanced.

 

This happened a few nights ago. I fired it up to take a quick reading of L- to bias (41 Volts when working and after it cuts out) and found that it was working again.  It failed again in around an hour in the same way.

 

Just looking for some ideas on where to go first/next trouble shooting.  I do hate intermittent faults!

post #20668 of 24765

I doubt its overheating, unless it's dirty inside... I'll be opening it up when I have a few minutes to check that.  It's cool here in the UK as is the listening room.  Plenty of ventilation around the unit.  

 

The voltage question is interesting... It is set for 220V.  When I checked my line yesterday it was just over 230V. Tonight (late) I checked it and it was dancing between 238 and 240V.  Interesting stuff.  I will change the voltage setting after opening and cleaning.

 

Thanks all for the suggestions.  I will keep you posted if you're really bored and interested.

 

 

Quote:
Originally Posted by Michgelsen View Post

My 717 has cut sound two times on very hot summer days, due to overheating. When the amp cools down, it should work again.

On two or three other occasions, inserting the plug from the headphones while the amp was on caused the amp to go into this 'protection mode'. Switching off the amp and disconnecting power for a few seconds, then switching it back on made it work again. This is very rare though. Normally when I disconnect or connect headphones while the amp is on, nothing happens.

I have read reports of 717s overheating due to being configured for the wrong voltage. For example the amp could be set for 220 volt when the line voltage is actually 230 volt, in which case it's better to set the amp for 240 volt operation.

Can any of these points be the source of your problem?

 

post #20669 of 24765

Someone has compared these amp : 

 

SRM600ltd

SR717

SR727

SR007t

SRM T-1(S)

 

?

post #20670 of 24765

Just a question (for spritzer), would http://www.electromod.co.uk/product-detail.asp?P=1 these be suitable for recabling the Lambda Pro's? Both are pro-bias.

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