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Old 3rd December 2003, 03:31 PM   #1
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Default DACT CT101 Preamp modules

While browsing Audiocom's website, I noticed they have started selling DACT CT101 Preamp modules. These look very interesting, and are cheap as chips.

Does anyone have any experience of these?
http://www.dact.com/html/line_stages.html

I currently use a NAC32, but am considering replacing it with something a little more modern, rather than going down the road of tweaking the Naim circuit to death.

It seems to be pretty well thought of, are there any alternatives I should consider (the JL Hood amp seems very interesting, as do the Nelson Pass designs mentioned here).

Thanks,

Edward
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Old 3rd December 2003, 03:58 PM   #2
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Phono module CT100 624 USD Ouch!
Line amp CT101 182 USD + 296 USD for PS Ouch!
http://www.nutshellhifi.com/dact.html

Note that the line amp consists of two current feedback(?) opamps probably from AD. The pcb looks nice though and I'll guess that they are quite good also.
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Old 3rd December 2003, 04:09 PM   #3
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Wow, the phono module is expensive!

I was going to knock together a simple regulated supply using LM317/337 chips, then replace them with some of Andy's Super Regs once I have more money. I have a transformer which would do the job nicely, so I will only need to stump the £87 for the CT101 module, some smoothing caps and a case. I also plan to use a two channel alps pot or similar now, and upgrade to a DACT attenuator in the future.

Hmm...

I am going to try this once I have finished with my CD player (3 super regs and an Audiocom Superclock on the cards), and have a bit of cash to play with.
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Old 3rd December 2003, 04:48 PM   #4
Cobra2 is offline Cobra2  Norway
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Thumbs down I had one...

And for not wasting the attenuator, I ripped the parts, and rewired/modified it into this: http://www.stereophile.com/amplifica...54/index5.html
(Using a BUF-04)
Much better....

Arne K
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Old 4th December 2003, 05:52 PM   #5
Nisbeth is offline Nisbeth  Denmark
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AFAIK the CT101 is just the attenuator. The preamp-module will cost you an arm and a leg extra If you're not building a passive preamp, you need some form of active circuitry in front, i.e. a Zen-amp or the preamp Arne links to (Aunt Corey's buffered passive).

If you get a board and would like to experiment, try running the board off two 12V SLA's....


/U.
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Old 4th December 2003, 07:20 PM   #6
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The CT101 is the preamp, the attenuators are the CT1 and CT2 (I think). As I said, I plan to build it with a Pot initially, and will upgrade to a stepped attenuator in time.

Using batteries is a good idea, I reckon all in the amp would cost less than £120 (~$200).
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Old 4th December 2003, 08:59 PM   #7
Nisbeth is offline Nisbeth  Denmark
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Sorry, I didn't have time to check the link before I posted.

You need 2 12V SLA's (I think any model from ~2 Ah and up should do), and a charger circuit of some sort and you're all set to go . You can build a simple charger with an LM317 or LM350 and current-limit it to about 1/10th of the rated capacity of the batteries. Not entirely optimum for the SLA's, but it works fine.


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Old 27th November 2007, 09:13 PM   #8
iwok is offline iwok  Poland
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I am interested if anyone build pre based on DACT CT-101 module. I am wondering how it could cooperate with Icepower amplifier.
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