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Old 22nd January 2013, 07:35 PM   #221
Hi_Q is offline Hi_Q  England
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You only need to pull V2 if it is the left channel you have problems with. If the hum goes the problem is probably in the pre-amp. If it is still there then maybe you have a problem in the output stage or the coupling.
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Old 22nd January 2013, 07:53 PM   #222
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Quote:
Originally Posted by Hi-Q View Post
You only need to pull V2 if it is the left channel you have problems with. If the hum goes the problem is probably in the pre-amp. If it is still there then maybe you have a problem in the output stage or the coupling.
Ok, the hum is still there, so what next Les ?
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Old 22nd January 2013, 08:50 PM   #223
Hi_Q is offline Hi_Q  England
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What are the bias voltages on the two left channel EL34's? They should be more or less the same at around 0.35V as measured across the 10 Ohm bias measuring points.
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Old 23rd January 2013, 06:20 PM   #224
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Originally Posted by Hi-Q View Post
What are the bias voltages on the two left channel EL34's? They should be more or less the same at around 0.35V as measured across the 10 Ohm bias measuring points.
Ohhh... so that's all it was lol. I didn't touch the bias... Yep on that side I got readings of 0.08 and 0.67. So now the fun of putting the new caps back in

Thanks Les
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Old 25th January 2013, 11:36 PM   #225
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Does anyone know the value of the potentiometer ?

I want to replace it with a motorised one. Hificollective offer 20K or 50K alps blue dual gang. But other values are available from elsewhere.
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Old 26th January 2013, 12:16 AM   #226
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Pot is 20k. You should be able to find the schematic with a Google search. If you can't find it send me a PM.

You may find this interesting:

http://homepage.ntlworld.com/lez/YAQ...IN%20MC10L.pdf
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Old 26th January 2013, 12:23 AM   #227
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Thanks, 20k

I have just realised that hificollective are asking 100 for the pot + receiver.....
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Old 30th January 2013, 05:56 PM   #228
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Time for a little rewire of the signal cables. Straight forward enough, however the ones leaving the preamp board to power stages are 3 core. Can someone explain this and also identify the connector types please so I can get more of them

Click the image to open in full size.
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Old 2nd February 2013, 12:30 PM   #229
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Does anyone have a schematic for the amp please ?
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Old 2nd February 2013, 01:04 PM   #230
Koifarm is offline Koifarm  Netherlands
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At your service.

Click the image to open in full size.

Usefull link: http://www.cathedralspeakers.com/yaqin

Last edited by Koifarm; 2nd February 2013 at 01:06 PM.
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