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Old 1st August 2003, 11:22 AM   #1
Jennice is offline Jennice  Denmark
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Default Stax SR-34 black box

Hi folks,

Does anyone know what is hidden (apart from a transformer) inside the black box that comes with the Stax SR-34 electrostatic headphones?

If possible, schematics would be nice to have...

Regards,
Jennice
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Old 1st August 2003, 12:15 PM   #2
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There must be a diode multiplier for the polarising voltage. Sorry, haven't really looked. I had Stax in my 'junior' years when i believed opening boxes was bad
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Old 1st August 2003, 02:58 PM   #3
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Peter is pretty close with what's inside one. If you have a unit, open it and trace it out; should take 2 minutes.

I had one of these 20 years ago before upgrading to the Lambda range (which I still use).
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Old 1st August 2003, 09:17 PM   #4
Jennice is offline Jennice  Denmark
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Default Watch and learn...

that's what I did.

The rotary switch (speaker/earphones) needed cleaning desperately, so I took and opened the mysterious black box. Man, was I dissapointed !

They made us pay all that for the twp connectors, a rotary switch, and two pathetic small transformers with thermal resistors (for safety I suppose) on a PCB!
There is not even a bias voltage. I learned elsewhere that some of them have the static charge on the foil which decayes ower the years, after which you'll need service 'sob*

TWO transformers... *pout*

Well, so much for the mystery...

I guess this pretty much settles the topic...

Jennice
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Old 1st August 2003, 09:48 PM   #5
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The ones that don't require bias votage are electret, not electrostatic and have always been the cheap range of Stax AFAIK.
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Old 1st August 2003, 09:59 PM   #6
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You are all correct, but you should consider heading over to http://headwize2.powerpill.org/projects/index.htm for an interesting read.

Petter
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