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Old 22nd September 2020, 03:27 AM   #1
cellojazz is offline cellojazz  United States
diyAudio Member
Join Date: Sep 2020
Question Upgradng Yaqin MC-13S - Parts Questions

First, my appologies, I may not know the best formatting as I'm new to this forum, so I hope my post is functional enough. If not I'm willing to learn!

I have an audio repair person helping me with some upgrades for my Yaqin MC-13S. I am also getting started with DIY audio and am planning to try a preamp soon - but I'm not ready yet and I want my amp functional before the holidays :-) Also, I might not have gotten the specs right from my repair guy. I think I'm close, but looking for help there too.

The upgrades we are attempting are listed here... although the documentation is a bit sparse:

Yaqin MC13s Upgrades and Switchable Feedback Installed – AD Audio Consultants

Click the image to open in full size.

The quick version is that they made these changes:
Elna Silmic bypass capacitors,Mundorf ZN coupling capacitors, and Takman carbon film resistors, and a switch to disable negative feedback.

My repair person gave me the parts I would need, although I wanted to double check because he's ultra busy - and I want to make sure I understand as best I can.

1) Coupling Capacitors: .47mF 600v(or more) x 4
2) Bypass capacitors: 470mF 25v x2
3) Grid Resistors: 2w (or 3) at 820 ohms
First - could someone confirm this is accurate from this schematic:

Second I was planning on:

Mundorf Supreme SilverGoldOil caps
and Audio Note Silver non-magnetic Resistors (820R Ohm, and 2Watt).
Are these decent choices?

Thank you in advance for looking over and helping me.
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