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Old 15th February 2010, 08:36 PM   #1
Pano is offline Pano  United States
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Default FS: DAC output transformers - Onectics

I have for sale a few DAC output transformers. All new, never used.. See photos below.

These were custom designed for the output stage of a voltage DAC. Core is 48% nickel.
There are 1:1 ratio with with a center tap on both primary and secondary. So you could have 1:1, 2:1 or 1:2 ratios.
These are PC pin types made for fit on a PCB. They can, of course, be hand wired.

I had these made by Bud Purvine of Onetics transformers. I have listened to and tested many transformers, the Onectics have always been the best I've heard.

Cost is $45 US each, shipping to any USA address is free! For international, please inquire. Paypal in US funds preferred.
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File Type: jpg onectics-2.jpg (55.4 KB, 839 views)
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Old 15th February 2010, 10:20 PM   #2
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HI panomaniac,

can you put aside 1 pair for me?

Am at work now and not meant to use internet so please send me an email or I will contact you when I'm home (in about 9 hours time).

thanks, sp
Old 15th February 2010, 10:22 PM   #3
Pano is offline Pano  United States
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Sure SP, will do.
Old 15th February 2010, 10:25 PM   #4
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I want some, at least a pair, maybe more. Mail me.

I was actually going to mail you or Bud about these, i have acquired a DCX (free but with a glitch i hope Daniel can fix)

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
Old 15th February 2010, 11:37 PM   #5
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Interesting. Would these be able to combine the balanced outputs from a CS4397 into a full-voltage single-ended output?

I am currently running single-ended from the "+" output pins, straight into my amp after an MKP. Basically, I am wondering if these would improve my sound?
Old 16th February 2010, 05:24 AM   #6
Pano is offline Pano  United States
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OK Dave. I'll email you in the morning.

Grip. Yes, these will do the balanced to unbalanced act for you. I think they sound great.
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Old 16th February 2010, 06:55 AM   #7
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Default any left?

Hi panomaniac

Any left? What would shipping (slowwwww) to the Netherlands cost?


Old 16th February 2010, 08:51 PM   #8
Ciu is offline Ciu  France
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Which impedance are they ?
Do you know primary DCR for 1:1

Thanks !
Old 16th February 2010, 09:08 PM   #9
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They are 1:1 ratio but deigned to be driven from a source of about 100-200 ohms into a load of about 10K or more. Typical of a voltage out DAC into a preamp or power amp.

DCR is about 50R. But that is NOT the impedance seen by the load - except at DC. At anything about 15Hz, the source will see the approx. the impedance on the secondary.

BTW, dimentions are: 36x29mm 29.5mm high, including the pins.
Old 19th February 2010, 03:07 PM   #10
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any left?

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