Yaqin MS-12B valve preamp

**jonners** · 22-01-2010, 12:28

Hans -

When you put the 6N2P's in, notice that pin 9 is a screen between the two sections so it would be good to earth it. ( On the 12AX7 pin 9 is the heater center tap so I think you'll find it is left unconnected on the Yaqin).

**tomatamot** · 23-01-2010, 07:56

John,

I know. Found yesterday afthernoon a few nice 1K2/3W carbon resistors, cheap! I try these at first and in the mean time I have to wait on the Russian tubes. I d`nt expect a great result of the 6N2P`s, but you never know.

**trailer** · 14-02-2010, 17:32

Any of you valve heads had any experience with one of these?

http://cgi.ebay.co.uk/Yaqin-CD3-Tube...item3caa1d00b2

**trailer** · 16-02-2010, 18:41

I guess not?

**jonners** · 27-02-2010, 23:13

Having read good things about the TJ Full Music valves, I tried a pair of their 12AU7's in my MS-12B. Result: Return of whistling noises.

These are much more microphonic than the JAN 5814's I was using before.
I pulled the TJ's and put the 5814's back. Result: No more whistling noises.

Any progress with your Yaqin, Hans?

**tomatamot** · 02-03-2010, 03:42

Originally Posted by jonners

Having read good things about the TJ Full Music valves, I tried a pair of their 12AU7's in my MS-12B. Result: Return of whistling noises.

These are much more microphonic than the JAN 5814's I was using before.
I pulled the TJ's and put the 5814's back. Result: No more whistling noises.

Any progress with your Yaqin, Hans?

John, I have at the moment TJ Full Music 12AX7 in a EAR 834P MM. Sounds beautiful!
I`m finished with my MS-12B.

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