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post #10111 of 18428
fishpatrol: There's a reason there's a min post count limit before you can sell stuff. It's not so you post it for sale outside the trading forums.

Back on topic: Lambda Singatures (I don't recall if they are Nova or not) are on my list of Stax to try. I wouldn't be surprised if I end up with 3 sets of Stax HPs the way things are going.

Quote:
Originally Posted by HeadphoneAddict View Post
Re: PS Audio - I wanted to trade my APS modded ESP950 for Blutarsky's Stello DA100 Signature that is on the way - he decided to buy a PS Audio DLIII and we'll compare them, and he will give me either the Stello or the PS Audio for the ESP950 depending on our testing. We both know we already like the Stello sound signature, and if he keeps both his Stello and neither us likes the PSA then we can return it and try something else.
I'm keen to read your impressions on it vs. your Apogee.
post #10112 of 18428
Dupe.
post #10113 of 18428
Quote:
Originally Posted by edstrelow View Post
Over the weekend my Stax 717 amp shut down twice while running the 007A. I had turned it on after I got up in the morning but didn't get around to listening for about 4 hours. When I put some music on it played for about 3 minutes, then there was a short screech and the sound sound stopped. After I turned the amp off for a minute. It played again and then did the same shut down a few minutes later.

I let it sit for about 1/2 hour, blew some dust out of the amp, tried it again and it worked fine. I haven't had any problem since but I have not left it sitting for 4 hours at a time.

Anyone have any idea what could be going on?

Is there a protective circuit or what?

I suspect overheating and think I should open the unit up and clean it properly. It has an open grill on top and has been collecting room dust for a few years now.

My 717 shuts off with the power led staying on when there is any input anomaly like when the plug on my DAP is wiggled and in addition it does shut off when an object is placed on top of it covering one third or one quarter of the venting holes and both the Jade and O2 are driven for a while eventually raising the temperature above a predetermined level. Powering down waiting a few seconds and powering up again resolves the problem.
So there must be input, output, and temperature protective mechanisms.
post #10114 of 18428
Quote:
Originally Posted by spritzer View Post
There is a protection circuit in the amp with relays on the output, probably triggered by excessive DC voltage. My first cause of action would be to clean the amp as dust and high voltage don't mix and if that doesn't work, send the amp back for service. You can also check and see if the the amp boards are properly seated inside and make sure the contacts are clean. Make sure you can't get zapped as there is a lot of power stored in those caps.
Thanks for the warning. A friend of mine who is a researcher in auditory neuroscience told me how he got zapped years ago by the capacitors in a piece of equipment even though it was unplugged. He and his hand froze attached to the equipment and someone else in the lab had to knock him down to break contact.
post #10115 of 18428
Quote:
Originally Posted by kintsaki View Post
My 717 shuts off with the power led staying on when there is any input anomaly like when the plug on my DAP is wiggled and in addition it does shut off when an object is placed on top of it covering one third or one quarter of the venting holes and both the Jade and O2 are driven for a while eventually raising the temperature above a predetermined level. Powering down waiting a few seconds and powering up again resolves the problem.
So there must be input, output, and temperature protective mechanisms.
Sure sounds like I need to open up the717 and clean out the dust.
post #10116 of 18428
Quote:
Originally Posted by edstrelow View Post
Sure sounds like I need to open up the717 and clean out the dust.
It's not too difficult to clean... I just used my vacuum cleaner to suck up the dust that tends to form around the capacitors, and near the transformer.
post #10117 of 18428
Quote:
Originally Posted by krmathis View Post
Great to hear!
Never heard the Lambda Nova Signature myself, but have heard the Lambda Signature and prefer it over the SR-404.


Remove the old pads, and as much as possible of the old tape residue. Then mount the new pads.
NB! Make notice of the pads orientation before mounting, as they can mount 4 ways while just 1 way is correct.
Yeah the LNS is really something special, so much more musical than the 404, I can listen to it all day, and just forget the whole headphone part, just listen to music . Anyway thanks for the advice, it seems a bit 'risky' to me, is there a chance that I screw it up when all sorts of residue stick to the frame, or wll the new pad just cover this ets.
post #10118 of 18428
fishpatrol. There is a reason why we have a dedicated FS (For Sale) forum.
...and circumventing the posting rules by advertising here is not the right way to do it.

Quote:
Originally Posted by vvanrij View Post
Yeah the LNS is really something special, so much more musical than the 404, I can listen to it all day, and just forget the whole headphone part, just listen to music . Anyway thanks for the advice, it seems a bit 'risky' to me, is there a chance that I screw it up when all sorts of residue stick to the frame, or wll the new pad just cover this ets.
No need to worry!
The clue don't stick that much, so no chance to destroy the plastic frame. Just lift the pads off slowly, while trying to get as much of the glue with them.
In either case, the new pads will cover it all.
post #10119 of 18428
Thank you very much, I put on the new pads and it was indeed very easy!
post #10120 of 18428
^ Happy ending!
post #10121 of 18428
after all this time, i put my stax on and forget i have them on now, having had any annoying creaks. But my friends say its my wife, cause all i do is talk about how awesome they are.
post #10122 of 18428
SIDE NOTE.. You know, you never realize how noisy your house is, until your listening to stax. all stax purchases should come with an isolation booth! lol.

<--frustrated listener.
post #10123 of 18428
Quote:
Originally Posted by lyricalmoments View Post
It's not too difficult to clean... I just used my vacuum cleaner to suck up the dust that tends to form around the capacitors, and near the transformer.
Please be careful - especially transformer. It does not mean that each time when the power is off it does not retain some high current. Best if you unplug the power cords fully, leave it off for a while before allowing your bare hands inside. I was shorted a total of 3 times at different ocassions. Once I came almost near to either standing infront of god or saturn. The release of the electrolites into my body was like someone wacked my heart with a base ball bat and I was thrown on my back on the floor. Momentarily, I could felt I could not breathe, but I guess god must have felt it was not time for me yet. Lucky me!!! Mind you, the power was off when I got shorted. Please also remember that the 717 has high voltage inside.

The 717 has biasing ports inside that can affect its sound and you want to be careful not to move them accidentally. I would just use a hair dryer set to blow cold air to remove some of the dust, but that is just me.
post #10124 of 18428
Sorry duplicated posts. Mod pls delete. Thank You.
post #10125 of 18428

Shocking

Quote:
Originally Posted by Victor Chew View Post
Please becareful. It does not mean that each time when the power is off it does not retain some high current. Best if you unplug the power cords fully, leave it off for a while before allowing your bare hands inside.
How long must the power be off before it is safe to touch the innards of an
007t or similar amp?
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