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Old 14th January 2012, 03:22 PM   #121
Jpeg is offline Jpeg  United States
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Well, the first thing I would do is switch the left and right channel tubes and see if the issue swaps channels too. My Yaqin came with a bad tube.
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Old 15th January 2012, 12:41 PM   #122
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Thanks Jpeg - such an obvious first step (do I feel dumb or what?) I'll have some time tomorrow to try this, I hope it is only a duff valve.
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Old 17th January 2012, 11:29 PM   #123
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Hey guys, I just got my hands on a MC-10T. I am very impressed with the out of the box performance and I'm total noob when it comes to playing with tube gear. I've read plenty of posts and blogs about people swapping out the standard tubes in MC-10Ls and understandably everyone has their own preferences. I can't afford to start tube rolling until I find something I particulally like, I also couldn't really justify spending the amount I spent on the amp again just in tubes. Does anyone have any suggestions for some cheaper tubes for the MC-10T that will give a marked improvement in the sound of this amp? Any suggestions would be greatly appreciated.

Thanks,
Ashlin.
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Old 17th January 2012, 11:51 PM   #124
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The first thing I would do on a yaqin MC-10 is elevate the heater voltage to about 50V.

The cathode-heater voltage on the top triode of the SRPP is way out of spec of the tube rating and will cause trouble.
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Old 18th January 2012, 12:40 AM   #125
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Found some good MS-10L reading here: http://homepage.ntlworld.com/lez/YAQ...IN%20MC10L.pdf
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Old 18th January 2012, 01:13 AM   #126
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Sorry, that would be MC-10L
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Old 18th January 2012, 01:42 AM   #127
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Quote:
Originally Posted by Globulator View Post
The first thing I would do on a yaqin MC-10 is elevate the heater voltage to about 50V.

The cathode-heater voltage on the top triode of the SRPP is way out of spec of the tube rating and will cause trouble.
I take you're not refering to this problem then? Yaqin MC-10L Heater Voltage
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Old 18th January 2012, 09:00 AM   #128
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Originally Posted by kemicalx View Post
I take you're not refering to this problem then? Yaqin MC-10L Heater Voltage
No!

There is an SRPP stage in the amp, the top cathode must be about 150V, the heater is at 0V.

All tubes have a limited heater/cathod voltage, the Yaqin runs them above this limit which will stress the tube and IMO affect the sound too.

I think the following stage is also affected - you need to elevate the whole heater circuit to take the pressure off the tubes with HV on the cathodes.

This is the first thing I would do to this amp, before I switched it on.
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Old 18th January 2012, 01:47 PM   #129
GloBug is offline GloBug  Canada
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Lesson learned, don't buy a cheap Chinese amp.

Why does DIYaudio have as many threads about fixing new Chinese amps as they do restoring vintage amps??
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Old 18th January 2012, 01:51 PM   #130
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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.
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