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Old 2nd February 2013, 01:09 PM   #231
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Originally Posted by Koifarm View Post
At your service.

Click the image to open in full size.

Usefull link: MODIFYING THE YAQIN MC-10L
dank je wel !
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Old 2nd February 2013, 01:17 PM   #232
SY is offline SY  United States
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Wow, there's a lot of work to do. Do they really have 130V cathode to heater for the 6N1? Unbalanced phase splitter? A quasi-SRPP (badly unbalanced) input stage?

Wow.
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Old 2nd February 2013, 04:37 PM   #233
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Default hum on right channel speaker

Newbie in tubes here>>

This is great thread and forum for Yaqin MC10-L. I have a unit that is about 3 months old and IT DEVELOPED A HUM ON THE RIGHT CHANNEL. I can still hear the music but the hum is there..i checked the bias on V2 and it was 0.06v)

i contacted the seller for help and was told to do the ff:

Move V1 to V2 socket and if there is bias the problem was V2 (EL34).

my questions:

1.is this check enough to isolate that the issue was V2 (l34)? I ordered new ones and on the way..from CAnada..

2. When i put V1 to V2 how long do i have to wait to make a reading? seller says within 3 minutes? is this right?

thanks in advance!!!

Audio0412
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Old 4th February 2013, 11:34 PM   #234
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I think wait more than 3mins, 10 should do it
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Old 4th February 2013, 11:55 PM   #235
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Quote:
Originally Posted by SY View Post
Wow, there's a lot of work to do. Do they really have 130V cathode to heater for the 6N1? Unbalanced phase splitter? A quasi-SRPP (badly unbalanced) input stage?

Wow.
They probably believe in "Euphonic distortions". Speaking of 130V cathode to heater, I never had any issue with such voltages.
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Last edited by Wavebourn; 4th February 2013 at 11:58 PM.
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Old 5th February 2013, 12:54 AM   #236
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Originally Posted by Barbieboy View Post
I think wait more than 3mins, 10 should do it

thank you!!
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Old 5th February 2013, 11:52 PM   #237
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Originally Posted by SY View Post
Wow, there's a lot of work to do. Do they really have 130V cathode to heater for the 6N1? Unbalanced phase splitter? A quasi-SRPP (badly unbalanced) input stage?

Wow.
What's wrong with the phase splitter?
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Old 6th February 2013, 10:25 AM   #238
DF96 is offline DF96  England
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Originally Posted by SY
Unbalanced phase splitter? A quasi-SRPP (badly unbalanced) input stage?
I was going to say that the apparently "unbalanced" phase splitter was an attempt to correct for the lack of a CCS tail, but then I noticed that the anode resistors were the wrong way round so they increase imbalance rather than correcting it. Either a mistake or an attempt at 'euphonic' distortion.

The "quasi-SRPP" looks like the designer could not decide whether to do a proper SRPP or a proper mu follower, so just left it as an unbalanced SRPP - which will be worse than either of them! Given the relatively high impedance load a simple active load stage would be just as good, but Chinese designers do like the SRPP and audio buyers seem to like it too.

The output grid resistors are quite low in value so will load the LTP and increase distortion. Maybe low values are needed to cope with gassy Chinese valves?
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Old 6th February 2013, 12:18 PM   #239
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Thing is though, this amp already sounds very good...good enough that I'm sure my 46 year old ears would fail to differentiate it from my $1500 ss amp in a blind test. Why not simply enjoy it as is?
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Old 6th February 2013, 12:40 PM   #240
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Recently had a Krell amp here, the Krell won*, just, by its articulate upper bass. Then I upgraded the caps in the 10L, made a staggering difference. Now prefer the 10L any day.

*My speakers are an easy load to drive, so the Krell would have come into its own with different speakers
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