[Bob Perilstein]

Hello,
I too have a Yaqin MC10L,and I'm very impressed.For less than 400.00US,it is an incredible value.
The small tubes you are wondering about are Shuangang 6N1's. I had a little hum at first,but after replacing them with Svetlana 6N1p's and the hum was gone. I have some T.A.D. EL34B's coming,but the more I listen,the stock Shuangang EL34B's just keep sounding better. I guess I'll find out after a comparison.