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Dadbeh 18th July 2019 07:08 PM

chinese 12AU7/6922 preamp kit questions
I am building this 12AU7 tube preamp that has single ended and balanced inputs and outputs and the kit requires the use of two coupling transformers that facilitate converting a single ended signal to balanced and vice versa.

Hi End AudioResearch ARC Tube Preamplifier XLR Balanced Or RCA Input&Output,12AU7/ECC83+ECC88/6DJ8 Preamp DIY Kit-in Amplifier from Consumer Electronics on | Alibaba Group

The problem is that other than 600:600 I dont know anything about the correct part and its parameters. there is a bunch on mouser but they have different frequency range etc and it is not clear to me which one would be ideal.

R Kneck 19th July 2019 12:51 AM

Hi Dadbeh,
Edcor sells a 600:600 transformer
EDCOR - XSM Series

Dadbeh 19th July 2019 12:55 PM


Originally Posted by R Kneck (
Hi Dadbeh,
Edcor sells a 600:600 transformer
EDCOR - XSM Series

thank you so much. this is great and exactly what I needed.

there are a bunch of them on mouser from $5 but their frequency range is something like 300hz to 3.5 khz. this edcore is one of the few 20hz to 20khz which I'm assuming is needed here.

Dadbeh 19th July 2019 01:50 PM

I could use more help. I have never built a tube based kit and these are the AC requirements:

AC/6.5V/2A (3%) _ AC/280V-0-280V/100MA (5%) _ AC/14V/3A (10%)

I could use some direction from someone with experience. what should i order? should it be 3 separate trannys or just one that has different winding? please advise.

R Kneck 20th July 2019 01:21 AM

A Hammond 270Dx transformer will get you most of the way there, 275-0-275 at 104 mA, and a 6.3volt at 3 amp winding. The 14 volt transformer I don't have a clue where to get.

Dadbeh 20th July 2019 04:30 AM

I already own this one: AS-1215 - 100VA 15V Transformer - AnTek Products Corp
can it be used for the 14v?

Dadbeh 20th July 2019 04:48 AM

Dadbeh 20th July 2019 04:50 AM

as for the 185v, i was thinking this one: EDCOR - XPWR009

R Kneck 20th July 2019 11:05 AM

Yes, the Edcor power xformer should work fine. The Antek should work also but has over twice the power capacity than was called for. Better to have too much than not enough. Is there a schematic?

Dadbeh 20th July 2019 04:53 PM


Imgur: The magic of the Internet

Order already placed for the edcors.

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