Stax SR-34 black box

Jennice · 1st August 2003, 10:22 AM

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

analog_sa · 1st August 2003, 11:15 AM

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

Brett · 1st August 2003, 01:58 PM

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).

Jennice · 1st August 2003, 08:17 PM

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

analog_sa · 1st August 2003, 08:48 PM

The ones that don't require bias votage are electret, not electrostatic and have always been the cheap range of Stax AFAIK.

Petter · 1st August 2003, 08:59 PM

You are all correct, but you should consider heading over to http://headwize2.powerpill.org/projects/index.htm for an interesting read.

Petter

1st August 2003, 10:22 AM	#1
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	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

1st August 2003, 08:17 PM	#4
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	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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1st August 2003, 11:15 AM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	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

1st August 2003, 01:58 PM	#3
Brett diyAudio Member Join Date: Jan 2002	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).

1st August 2003, 08:48 PM	#5
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	The ones that don't require bias votage are electret, not electrostatic and have always been the cheap range of Stax AFAIK.

1st August 2003, 08:59 PM	#6
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	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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