Chinese LM3886 + 6N11 diy kit - worth or not? - diyAudio
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Old 11th October 2014, 07:35 PM   #1
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Default Chinese LM3886 + 6N11 diy kit - worth or not?

Hi,

Is there a point of using tube in such amp? Is it worth its money? ~$50.

From seller: The circuit uses a 6N11 ( or 6922 or 6DJ8) as the input stage to enhance the musicality of the amplifier.

Pics are here:
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More from the seller:
MAIN FEATURES:
Output Power 68W+68W
Power Supply: AC220V or AC110V available
Front Panel color:Golden or Silver (If no note,we will sent Random)
Output impedance: 4-8 ohm
SNR≥ 92db
Conversion: 19V/us
Intermodulation distortion: 0.04%
Size:230 mmX 310mm X 90mm
 
This power amplifer using Tube 6N11 as preamp,and it also include speaker protection circuit,Independent filter,etc,With it you can enjoy Charming music.
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Old 11th October 2014, 07:39 PM   #2
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Old 11th October 2014, 07:44 PM   #3
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Looks like it is cathode follower... Correct me if I am wrong.
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Old 11th October 2014, 07:49 PM   #4
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With LM3886 as non inverting variant.

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Old 11th October 2014, 08:04 PM   #5
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Quote:
Originally Posted by gooduser View Post
Looks like it is cathode follower... Correct me if I am wrong.
That's just a pic of the tubes pin-out connection. Without a schem. it's just a guess, but most likely used as a common cathode gain stage.

jeff
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Old 11th October 2014, 11:51 PM   #6
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what is the ebay link ?
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Old 11th October 2014, 11:56 PM   #7
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URL: http://pages.ebay.com/link/?nav=item...440284&alt=web
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Old 12th October 2014, 01:43 AM   #8
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.
No, there's no point in using tubes unless you specifically want the "tube sound." (in Europe, the "valve sound") The whole point of going back to the future with tubes is that they distort in a musical manner, while op amps (chip amps) don't distort at all--or hardly at all. Tube heads just like the sound of tubes better.

Is it worth the money? Compared to the LM3886 or otherwise? You can't compare the cost of op amps vs. tubes, it's apples and oranges. It's the nature of the beast that tubes cost more--which I personally suspect is a selling point for tube heads.

Still, looking at the whole thing objectively, 50 bucks is a good deal for the listed item. So if you have the money to throw around what the heck.

BUT be aware that you'll spend twice that and more on the required power supplies and associated hardware. Be aware also that tubes work up in the 300-volt range, which is lethal voltage, don't get careless.
.

Last edited by bentsnake; 12th October 2014 at 01:49 AM.
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Old 12th October 2014, 02:39 AM   #9
Bare is offline Bare  Canada
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Awww C'mon a Decent quality 3886 Amp (not made of Fake parts) has NO need of a cheap chinese tube 'somehow' added on... to sound really good.
This is real life, Caveat Emptor ..Kids.
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Old 13th October 2014, 11:37 AM   #10
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Location: Norway
My brother and I bought 3 of these.
I think they are worth the money and they have a "musical" attitude.
Not the very high-end, but acts as a decent no.2 amp in a small system.
Some nitpickings and mods: (well, what do you want for nothing?):
C21 is now 3,3 uF w/ 0,1uF bypass
C20 is 3,3 uF (2,2 +1+0,1). C14 is 100 uF.
The 10 000uF are multiplied by 2 (now 20 000 x 2)
The tube is replaced by a Sylvania (best tweeter image in our system).
The potmeter is bad...
We had som oscillation noise when they were used in an active system (three way electronic crossover), but in stereo mode there were no problems.
Norwegian thread including some pictures:
6n11 + LM3886
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