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  1. #1
    Join Date: Apr 2008

    Location: Cheltenham U.K

    Posts: 412
    I'm John.

    Default Yaqin MS-12B valve preamp

    I've just lost a longish post I was creating on this so I'll keep it short now and add more later.

    I read mostly favourable comments about the Yaqin MS-12B on the 'net so I've bought one. I thought that at the very least it would tide me over while the rat's nest on the floor that is my diy Jfet phono stage gets organised into a box.

    I bought it off eBay: http://cgi.ebay.co.uk/FreeShipping-Y...3A1%7C294%3A50

    I didn't want to wait for the free shipping via a slow boat from China so on top of the very cheap 129GBP asking price (can't find a pound sign on this laptop!) I paid an extra 25 for airmail. It arrived in just under 2 weeks, well packed, and extra charges at this end were just under 20 quid.

    The manufaturer's website is good for a laugh: http://www.yaqin.cn/en/company.html

    The circuit diag. is below but I haven't checked it so can't vouch for its accuracy. Yaqin loses a few points imo for having that emitter follower buffer after the phono stages.

    Ergonomically it's a bit odd as you can see, with phono inputs at the front and cd input plus outputs at the rear. It's pretty solidly built, and bigger than I imagined :- 35cm from front to back.

    Early listening impressions were favourable, though it sounded a bit rolled off at frequency extremes and the stage with phono input was a bit restricted in width and depth. After a day or so it began to emit intermittent whistling noises (on both inputs). One of the 12AU7 valves was extremely microphonic.
    More to follow later....
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