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Old 21st December 2010, 07:53 AM   #1
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Join Date: Feb 2003
Default 47 Laboratory started selling kits

47 Laboratory eventually launched a new brand "47 Treasure" to the DIY market. The first product under this brand is model 0147, a headphone/pre-amplifier.

In the picture, the 0147 is a discrete solid-state preamplifier with a big transformer (as well as other 47 models). The volume control seems a blue ALPS, and the input selection is a conventional rotary switch. The overall design of this kit is possibly similar to the previous regular product model 4733 headphone/pre-amplifier.

Of course, I am curious about the sound. By the way, hope more interesting kits will be released.
Here's looking at you, kid.
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Old 22nd December 2010, 08:10 AM   #2
EUVL is offline EUVL  Europe
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Clever idea to wipe out clones !!

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Old 3rd February 2011, 07:57 PM   #3
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Just built a 0147 kit for my friend, and the sound is really impressive.

In fact, I did not expect too much from such an inexpensive headphone amp. However, as a preamplifier, the line out quality of 0147 is pretty good. Transparent, involving, alive, and very musical. It simply beats my well-tweaked B1.

47 Lab always surprises me.
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File Type: jpg 0147.jpg (101.4 KB, 372 views)
Here's looking at you, kid.

Last edited by Marlowe; 3rd February 2011 at 08:00 PM.
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Old 6th February 2011, 08:34 AM   #4
Francec is offline Francec  Australia
Join Date: Jul 2006
Location: Port Melbourne, Australia
No offence but it looks like (maybe not as good) as something I could build.
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Old 6th February 2011, 09:18 AM   #5
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Location: Malaysia
1. Not bad considering the kit includes matched devices like 2sk170s.
2. Wonder if possible to order extra power supply board for dual mono.
3. Also if regulated supplies will improve its performance.
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Old 6th February 2011, 03:19 PM   #6
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Join Date: Feb 2003
Yes, all the transistors in the kit are selected and matched.

As a headphone amplifier driving my Alessandro Music Pro, the sound of 0147 is very clean, and the background is very dark as well. I do not think a regulator is necessary.
Instead, in my experience, unregulated power supplies bring more "analogy" feeling to the music. The sound is more relax, more forgiving, and easier.

However, as a preamplifier, I hear a bit background noise from my speakers. Regulated power supplies may help.
Here's looking at you, kid.

Last edited by Marlowe; 6th February 2011 at 03:22 PM.
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