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Coupling transformer for SE/BAL conversion
Coupling transformer for SE/BAL conversion
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Old 18th July 2019, 07:08 PM   #1
Dadbeh is offline Dadbeh  United States
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Default 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.

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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 Aliexpress.com | 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.

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Last edited by Dadbeh; 28th July 2019 at 07:42 PM.
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Old 19th July 2019, 12:51 AM   #2
R Kneck is online now R Kneck  United States
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Hi Dadbeh,
Edcor sells a 600:600 transformer
EDCOR - XSM Series
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Old 19th July 2019, 12:55 PM   #3
Dadbeh is offline Dadbeh  United States
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Quote:
Originally Posted by R Kneck View Post
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.
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Old 19th July 2019, 01:50 PM   #4
Dadbeh is offline Dadbeh  United States
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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.

Last edited by Dadbeh; 19th July 2019 at 01:55 PM.
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Old 20th July 2019, 01:21 AM   #5
R Kneck is online now R Kneck  United States
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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.
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Old 20th July 2019, 04:30 AM   #6
Dadbeh is offline Dadbeh  United States
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I already own this one: AS-1215 - 100VA 15V Transformer - AnTek Products Corp
can it be used for the 14v?
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Old 20th July 2019, 04:48 AM   #7
Dadbeh is offline Dadbeh  United States
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Old 20th July 2019, 04:50 AM   #8
Dadbeh is offline Dadbeh  United States
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as for the 185v, i was thinking this one: EDCOR - XPWR009
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Old 20th July 2019, 11:05 AM   #9
R Kneck is online now R Kneck  United States
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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?
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Old 20th July 2019, 04:53 PM   #10
Dadbeh is offline Dadbeh  United States
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schematic:

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Order already placed for the edcors.
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