The Stax Thread III
Sep 12, 2013 at 11:38 AM Post #376 of 25,261
Hello fellow Stax aficionados!
beerchug.gif

 
Is anyone here from the EU who owns a SRM-310 and would be willing to sell it to me for a reasonable price? I know that this amp isn't so common, but maybe I'm lucky....
I have also created a thread in the sale/trade forum: http://www.head-fi.org/t/681305/wtb-stax-srm-310-eu-version
 
Sep 12, 2013 at 11:56 AM Post #377 of 25,261
It seems the channel imbalance has gotten better with my sig's. Time will tell... Right now it is only a dB or two..
 
Sep 12, 2013 at 12:40 PM Post #378 of 25,261
Nah, isn't better. Another issue, though. The right driver seems to squeal when I move my head, press the driver housing, makes adjustment, etc, but only when the sig's are connected to the T1? I have found it only happens in the pro socket as well. Beginning to think the problem might be with the amps output stage.
 
Sep 12, 2013 at 1:04 PM Post #379 of 25,261
Does the imbalance persist on the normal bias output, or is it only the squealing that is resolved?
 
Is there a proven methodology for (deep) cleaning electrostatic headphones? After I remove the old drivers from my HE60s I would like to disassemble them and give them a thorough cleaning to free them of any remaining dust and grime. Not sure if the cleaning agents to use for this or whether submersion is safe.
 
Sep 12, 2013 at 1:44 PM Post #380 of 25,261
It seems to differ whether there is imbalance on the normal bias socket. Suddenly one side just becomes softer in volume. Right now, it seems there is no or little imbalance on the pro socket as well. Dunno... Now the imbalance seems to be back. But not on the normal bias socket.
 
Sep 12, 2013 at 7:29 PM Post #381 of 25,261
If there is squealing from the transducers even when the earspeakers are not powered on from the amplifier then it means there is a small puncture into the internal dust filter somewhere and there is either hair or a dust particle sitting inside the stators.
 
To fix this you would would need to find a way to extract the hair or blow out the dust (not using a vacuum or air compressor) and then use a bit of clear tape and seal that puncture up.
 
It works as I've done this before.
 
Sep 12, 2013 at 7:36 PM Post #382 of 25,261
   

 
It's funny to look at how transistors were used in 1968.  The front end could just as well have been done with tubes and the back end... well it is quite primitive. 
 
Might want to add two diodes to the PSU for a full bridge. 

Thanks for that, looks like I can also easily add a (slightly lower) pro-bias at 560vdc. Cool.
 
Cheers
 
Sep 13, 2013 at 8:16 AM Post #383 of 25,261
There is no squealing when they aren't plugged in/ are plugged into the normal bias.
 
It seems the channel imbalance disappears the moment I press the right earspeaker to return within a fraction of a second. The driver squeals slightly while I do this.
 
Sep 13, 2013 at 9:56 AM Post #384 of 25,261
Is it a high pitch whine or squealing? Both can mean Shakespeare itself is squealing or a cap in the pro bias supply circuit on the amp has a cap going bad, electrolytic, polypropylene or ceramic.
 
Sep 13, 2013 at 10:36 AM Post #385 of 25,261
Squeal, I'd say.. It comes and goes. Also, they aren't working flawlessly on the normal bias either. Atm that is..
 
Sep 14, 2013 at 2:47 AM Post #386 of 25,261
All things considered do Stax amps, in general, sound better with the RCA connections or XLR?  I know there's a lot of variability but I would like to get things set up better and I will need some interconnects and wondered if I should go balanced or not.  
In the past I've heard benefits to both on other systems so just looking for opinions.
I have the SRM-717 and O2mk1.  I am looking either at an Audiolab 8200CD or going computer based with an HRT Streamer HD..  Both have balanced option.  Just can't decide which route I want to go yet.
 
Sep 14, 2013 at 11:15 PM Post #389 of 25,261
Subbed.
 
Sep 15, 2013 at 1:03 PM Post #390 of 25,261
In case anyone is interested...
 
http://www.head-fi.org/t/681729/comparisons-of-the-liquid-lightning-and-kgsshv-solid-state-stax-amplifiers
 

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