ESL Headphone X-former

[bjackson]

I need a stepup transformer for some ESL headphone I bought.

Anything that would have a good 20-20khz response and not cost too much. Power rating isn't really that necissary.

Any ideas?

[I_Forgot]

You might look for an adapter from some of the older stax, koss, or other brand headphones. The relatively delicate phones get destroyed and then people are left with the adapter box that contains the bias supply and audio transformers.

I_F

[Brett]

Originally posted by bjackson
I need a stepup transformer for some ESL headphone I bought.

Anything that would have a good 20-20khz response and not cost too much. Power rating isn't really that necissary.

Any ideas?

Which phones?

John Broskie of Tubecad did one for STAX cans in 2001 and there are a couple of designs by Kevin Gilmore on Headwize.

[bjackson]

They are Beyer Dynamic ET1000's. I bought them off of ebay as is, and I am really hoping that they are working! LOL.

When I get them in what is the first thing I should check to see if they are?

It is terminated with a 5 pin XLR.

[Brett]

Originally posted by bjackson
They are Beyer Dynamic ET1000's. I bought them off of ebay as is, and I am really hoping that they are working! LOL.

When I get them in what is the first thing I should check to see if they are?

It is terminated with a 5 pin XLR.

No knowledge or experience of the Beyers sorry. Apart from a breif period with a set of Sennheiser electros in the early 80's I've owned and used STAX's since my SR44's in about 1980. Mainly lambda Pros and currently SR404.

Have you contacted Beyer to see if they can be of any help with pinouts, bias voltages or schematics of previous drivers?

[bjackson]

I've sent them 2 emails and there has been no response. I am going to call I think tomorrow. Any idea how to determine these my self.