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Old 30th December 2005, 05:52 AM   #1
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Question upgrading to bal. output trannys

I purchased 4 Oxmoor 4x4 buffer amplifiers on ebay.
They were advertised there as the "transformer balanced" version, but when I recieved them, turns out they are the "electronic balanced" version.

http://www.oxmoor.com/files/cut%20sh...ut%20sheet.pdf

On the pcp board, there are 2 caps, where each channel's trannys would go. Now, because the same board is used for either option, yes, there are the pre-drilled holes for the tranny, as well as markings for a coupl'a resistors or caps too.

What would it take to make the switch?
Could I find the right values/parts myself, without too much hassle?

I would be using them between various synths and my semi-pro computer music settup (DAW).

=RR=
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Old 30th December 2005, 06:13 AM   #2
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Hi redrabbit,

I have designed transformer coupled broadcast standard mixing desks for a local manufacturer and commercial actively balanced pro-audio mixers, so may be capable of sorting your mess.

But your PDF doesn't open - at least not for me.

Cheers,
greg
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Old 30th December 2005, 07:50 AM   #3
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Try this non-pdf link:
http://www.oxmoor.com/products/4x4T.php

thanks.

=RR=
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Old 30th December 2005, 06:32 PM   #4
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Would I look at any of these circuit applications ??

http://www.jensen-transformers.com/apps_sc.html

...or do I need to squeeze information out of the manufacturer?? I seem to think they would rather have me send them the units, and pay for the change-over......but that's not DIY, and doing it myself is what I'm looking foreward to.....and learn some things to boot.

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Old 30th December 2005, 07:20 PM   #5
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Hi redrabbit,

The product you have directed me to is, indeed, an actively balanced input but transformer coupled output mixer/DA.

You wanted transformer inputs? This is an option?

Cheers,
Greg
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Old 30th December 2005, 10:47 PM   #6
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I apologize. That page is showing/describing the 4x4t.... ("t")..., the one I thought I was buying (and that is what I want to end up with, after putting in the optional transformer outputs).
All the other links on that page point to what I have now, the 4x4.....(no "t".....(no transformers)).

I don't need trannys on the inputs, btw.

=RR=
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Old 31st December 2005, 03:59 AM   #7
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Hi redrabbit,

So what you have is actively balanced (inputs and ) outputs and you wish to change it to transformer balanced outputs.

You need transformers and advice from the manufacturer as these are possibly fitting the same chassis/PCB easily for either model.

If not we need to obtain suitable quality/price line transformers and locate points in the cct to insert them.

Cheers,
greg
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Old 1st January 2006, 08:42 AM   #8
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Thanks for the replies. I will call the manufacturer, and ask these Q's. I think if I get a tech on the phone, he might understand my situation, and will be forthcoming with free advice.....someone in the front office, might not be so......keen.
But not always. For example I needed help on a discontinued JL Cooper product, and the tech there seemed annoyed that I was even asking for suggestions about who to send it to, for repair. Another company's tech talked my ear off about a diy upgrade to their product.

I'll post back when I hear something.

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