Just received a Yaqin MC-10T and have a couple of questions. - diyAudio
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Old 16th January 2012, 08:42 PM   #1
diyAudio Member
 
Join Date: Nov 2004
Location: Geelong, Vic
Default Just received a Yaqin MC-10T and have a couple of questions.

I just got my Yaqin MC-10T in the mail yesterday and I've got a few questions. I've got limited experience with valve amps. After installing the valves and adjusting the bias to 0.35v I have noticed that 2 of the 4 12AT7s are dimmer than the other 2. Across the front of the amp from the right they go bright, dim, bright, dim. The amp sounds fine, actually I'm very impressed with the sound. But comparing it to my only other valve amp, a schiit valhalla headphone amp, all of the tubes are equally bright. Should I be concerned? The only other thing I'm curious about at the moment is swapping out the factory tubes for something else. This site has some good info - 6th Street Bridge: Upgrading the Yaqin MC-10T tube amplifier

But I'm wondering if anyone here has some suggestions for affordable tubes that will give a marked improvement over the factory one.

Thanks for your time,
Ashlin.

Last edited by kemicalx; 16th January 2012 at 09:59 PM.
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Old 17th January 2012, 08:14 AM   #2
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Join Date: Nov 2004
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Actually I posted this at work, I got the order wrong, V1 is dim, V2 bright, V3 dim, V4 bright

Last edited by kemicalx; 17th January 2012 at 08:33 AM.
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Old 17th January 2012, 10:15 AM   #3
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I think it is just construction differences, please swap them around to check. If you have the increased brightness in the same position, then it is a problem.
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Old 17th January 2012, 11:04 AM   #4
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I'll have a play now. This is what they look like at the moment.

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Old 17th January 2012, 11:16 AM   #5
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Thanks mate, after swapping them around it does just look to be variations in the tubes themselves.. I also noticed one of them briefly glows brightly on start-up then dims down
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Old 17th January 2012, 11:20 AM   #6
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Quote:
Originally Posted by kemicalx View Post
Thanks mate, after swapping them around it does just look to be variations in the tubes themselves.. I also noticed one of them briefly glows brightly on start-up then dims down
That's also normal. By the way, if you ever plan going inside this thing, please consider removing these garish blue LED's!
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Old 17th January 2012, 11:24 AM   #7
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hahah yer aesthetically that glowing blue logo is the only thing I don't like!
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