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Old 18th January 2012, 01:01 PM   #131
GloBug is offline GloBug  Canada
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Right on!

The communist never seem to get past the chrome and blue LED stage in their design. Lol
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Old 18th January 2012, 02:48 PM   #132
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I think these Yaqin amps are actually a pretty good value. I've got an MS-20L and to my 45 year old ears it sounds every bit as good as my Scott 299D.
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Old 18th January 2012, 08:33 PM   #133
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The Yaqin MC-10L is the best of the cheap Chinese amps I think, and compared to stuff like Naim etc give a massive sound quality to price ratio.

The only real blunder is that filament/cathode voltage error which most 6N1P tubes seem to withstand for some time so I guess it's not bad. Looks nice too and sounds good out of the box.

Many other however have a lot worse than that - my Sweet Peach had recycled/fake capacitors that really lost the treble - an amazing feat for a coupling capacitor.

For the DIY scene where parts are scarce and pricey (UK/Europe etc) they are very useful as you get the whole transformers, chassis etc for a very good sum. The skill is then in turning these parts into a decent amp - but my Peach is now singing with the best of them - you'd never guess it cost 140 + DIY parts in a million years!
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Old 18th January 2012, 10:14 PM   #134
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Quote:
Originally Posted by Globulator View Post
The Yaqin MC-10L is the best of the cheap Chinese amps I think, and compared to stuff like Naim etc give a massive sound quality to price ratio.

The only real blunder is that filament/cathode voltage error which most 6N1P tubes seem to withstand for some time so I guess it's not bad. Looks nice too and sounds good out of the box.

Many other however have a lot worse than that - my Sweet Peach had recycled/fake capacitors that really lost the treble - an amazing feat for a coupling capacitor.

For the DIY scene where parts are scarce and pricey (UK/Europe etc) they are very useful as you get the whole transformers, chassis etc for a very good sum. The skill is then in turning these parts into a decent amp - but my Peach is now singing with the best of them - you'd never guess it cost 140 + DIY parts in a million years!
I'd love to know if they have addressed the issues you mentioned in the later incarnation of the amplifier, I know Les identifies some of the changes to the MC-10L in his write up, I'm wondering If there have been further improvements/corrections to the MC-10T, noting it now runs 12AT7s instead of the 6N1Ps
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Old 18th January 2012, 10:41 PM   #135
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Quote:
Originally Posted by Globulator View Post
The only real blunder is that filament/cathode voltage error which most 6N1P tubes seem to withstand for some time so I guess it's not bad.
Some owners complained of hum from different 6N1P's. Is there a connection?

jeff
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Old 19th January 2012, 11:49 AM   #136
data is offline data  Australia
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The best thing that I did with my MC-10L......well, it was a designer friend that actually did it, was to strip it down and use the transformers and feet (used the rec' and bias stage of the rear board too), with an all new (better) circuit.
Just wanted to add, that I do think it is very good value for the $$$, and that's why I originally grabbed one, I would have been very hard pressed to get transformers for the total including shipping cost
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Old 19th January 2012, 09:27 PM   #137
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I'm looking for replacement tubes for my MC-10T, can anyone tell me if there will be anything wrong with using these ones. They appear to have a good bang for buck ratio. I am interested in any other suggestions.

Preferred Series 7025

Tung-Sol EL34B
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Old 19th January 2012, 10:04 PM   #138
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just a quick note: I own the MC-10T and was really surprised by the quality sound I was getting out of it. It doesn't sound like a vintage tube amp - warm, rolled-off like a stock Dynaco 70 - but very modern.

The stock Shuguang tubes are pretty good - at least in my setup - but rolling in some good American/European 12AT7s really helped. Same with the EL34s, where I popped in original Mullard XF-2s (perhaps a little overkill for such a budget amplifier).

Anyways - my only complaint is the difficulty of working on these. The amp feels like something that Sony would build - ie it takes a lot of screw removing to get to the guts, and with the metalwork very tight on top, there isn't much choice for capacitor swapping.
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Old 19th January 2012, 10:24 PM   #139
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I find the Shuguang EL34's have nice mids, but a wooly bottom and a veiled top, I have a preference for the NOS Winged C's, very balanced with a detailed top, tight bottom and nice mids.

Edit: While my amp was still a Yaqin I replaced the .1uf coupling caps with Mundorf silver & oils, and replaced the resistors in the signal path with Kawame's, this was after Triode strapping the EL34's and severing the GNF line, all this made marked improvements to my ears. Although reducing the output power.

Last edited by data; 19th January 2012 at 10:30 PM.
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Old 27th January 2012, 09:52 AM   #140
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Can anyone tell me why the Tung Sol EL34Bs I ordered are missing pin 6, where the
Shuguang's was going to be replacing aren't. Will they still be all right to swap in?
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