how to build a pre using S&B TX-102 transformers - diyAudio
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Old 21st December 2004, 01:56 PM   #1
krishu is offline krishu  Europe
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Default how to build a pre using S&B TX-102 transformers

Hi,

so I start this thread now without having much to tell.

Some links which may be helpful first:
S&B TX-102 official page
Hifi NEws (UK) Review
Hifi World (UK) review
audiotweaks bent kit review
audioasylum t.Loesch review
Bent audio ... some schematics etc.

Cheers
Christian.
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Old 21st December 2004, 02:09 PM   #2
krishu is offline krishu  Europe
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Bent audio NOH preamp Assembly Photos
Bent audio download page .... schematics
Bent audio: TX-102 primary wiring schematic .... about +0dB and +6dB
bent audio: complete schematic with RCA and XLR inputs and outputs ... everything else

Cheers
Christian.
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Old 21st December 2004, 04:03 PM   #3
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Thanks for the info. I am still interested in a remote control for volume. Perhaps one using FET switches for each step.
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Old 21st December 2004, 04:06 PM   #4
krishu is offline krishu  Europe
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Hi,

easiest in my opinion is to use a rotary switch and a standard remote control kit in combination with a small DC motor and belt instead of motorized pot. A solution using relays is too big I guess.

Cheers
Christian.
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Old 21st December 2004, 06:20 PM   #5
wytco0 is offline wytco0  United Kingdom
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Great to see a build thread up for the TX102's, thanks krishu.

I got mine yesteday but I wont be able to start to build anything until later in January. At the moment I am not sure how I will approach my Pre Amp. I am looking forward to seeing other builders ideas.

I would also love a remote control solution but I dont want to do anything to compromise the sound quality.

Is there such a thing as a motorised multi position switch that we could use, I like the idea of a switch driven by a belt as it should be possible to keep the control system almost completly removed from the passive volume control. However I dont like the idea of making such a thing!! unless someone else could work out how to do it ;-)

PS I notice my transformers have different coloured wires, one has mostly black the other mostly white, is that significant?
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Old 21st December 2004, 06:33 PM   #6
Stocker is offline Stocker  United States
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Krishu, relays can be had with exterior dimensions of less than 2cm on a side.
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Old 21st December 2004, 06:33 PM   #7
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Konnichiwa,

Quote:
Originally posted by wytco0
PS I notice my transformers have different coloured wires, one has mostly black the other mostly white, is that significant?
That is intentional. One transformer is for L the other for R. Using different colours makes the wire spagetti a little better to work through.

Sayonara
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Old 21st December 2004, 06:58 PM   #8
wytco0 is offline wytco0  United Kingdom
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Thanks KYW, from speaking to JB yesterday I know you know a lot about these designs ;-)
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Old 21st December 2004, 09:48 PM   #9
mcs is offline mcs  Denmark
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Quote:
Originally posted by krishu
A solution using relays is too big I guess.
What's too big for you? I got everything to fit on a single euroboard (16*10cm) using standard sized relays, or you could use squadras layout using four 8*5cm boards.

You can see the layout of my board here: http://electronics.dantimax.dk/Kits/11021716092.html

The price could get lower with a groupbuy...

Best regards,

Mikkel C. Simonsen
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Old 22nd December 2004, 10:17 AM   #10
Gregm is offline Gregm  Europe
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Quote:
Originally posted by Krishu
use a rotary switch and a standard remote control kit in combination with a small DC motor and belt
Have you found sourcing for the motor & remote? It seems that there's also a matter of torque involved...
Otherwise, the "mechanical remote" seems indeed to be a simpler solution.
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