The 'NEW' YAQIN MS-20L Integrated Vacuum Tube Amp Thread - Page 17

here is my current set up.

Thanks...you right...I did not think on measurements in the amp...sounds very logical...will do that shortly

Latest generation of Yaqins is made for 120V. Even worse - they have overdone it on B+, I have MC-100B and it runs at 405-410V on the plates too. Initial design was for 450-460V.

I got my yaqin today and its still made for 115v

Custom DIY speakers there Shorty? Kind of resembles F-series HiVi woofs.

In any case cool looking DIY build.

Yeah they are the hivi f6 drivers. And hivi rt1.3 planar tweeters.

I have had my MS-20L for a year now. Still using the 6P3S-E outputs and 6J1P-EV in the front. Running the bias at .44 instead of .40, sounds better to me there. No issues at all with the tubes and I have no plans to change them, I even bought spares in case I blow some.

I am using Klipsch Heresy II speakers now, picked them up a month ago, upgraded the caps and plan to upgrade to the Heresy III woofers. The amp really sings with the Heresy's.

I use the UL mode pretty much all the time now, Triode just doesn't sound better with the new speakers and the UL mode has more punch. I also moved the 2 channel system into a larger room, it took a while to convince the wife.

I used to be an electronics tech in the 70s and love to tinker, thinking of replacing the coupling caps with Auricaps just to see if they make a difference, they are quite reasonable pricewise. I have changed a lot of crossover caps and found that more expensive does not always sound better. If I try it I will post the results here.

This amp is a keeper for sure.

The rest of the system:
Technics SL-1200M3D with Shure M97Xe cart
V-LPS phono pre-amp, I added a switch to adjust the input impedance and Pyramid power supply
Denon DCM-290 Cd changer
Klipsch Heresy II Signature Edition speakers

Not a great photo but it is hard to get everything in one shot.

How do you know?

It says it on it.

Tubes or solid state everything in the system is important, my suggestion is to find the speakers you like and work the system around those speakers i have owned Acoustat's electrostatics for 28 years now and the LAST units i would change in my system are the speakers.

What it says is irrelevant. Only measurements can give a sure answer.

Cytowing...realy nice speakers...with a sensitivity of 99 db,You can throw anything in Yaqin...I think it must be a deep love between the two

Just in case somebody wants to visite Yaqin website and get in contact with factory - http://www.fsyaqin.com here is mail address yaqin@yaqin.cn they are very kind and respond in few minutes

Man - I really like the counter top look - I'll bet your imaging is out of this world

New MS-30L is on the way with more power and great look

Do you have any pictures of the MS-30 and specs? Just curious what it will look like.

Go to Yaqin web site http://www.fsyaqin.com ,then click English on the right uper corner , - on the right part of the website there is a foto with EBOOK above the foto - click that foto and it will open for you whole Yaqin program
Edited by FineArts - 6/22/12 at 9:08am

Nice find! It doesn't have more power, though (it's still 50wpc). Details on page 10: http://www.fsyaqin.com/ebook/

EDIT: I'm interested in the MS-300C, but I don't care for the lies claiming it's point to point when it uses PCB ( http://www.head-fi.org/t/510551/yaqin-ms-300c-300b-amp#post_6987905 ).

I think there are some games about the output power....MS-20L is advertised as it has 2 x 50w but in my manuels it sais 2 x 40

My manual says it is 50wpc in UL, 25wpc in TR, I bought mine one year ago.

Realy interesting.......but according to what I hear,it has planty of power ...very happy how it drives Magnat towers...especialy with great soundstage ...also impressed with sound of drums and other percussion instruments
Edited by FineArts - 6/24/12 at 8:20am

which are the preamp tubes, the front two on each side or the rear two on each side?

The front two 6J1's on each side form an input SRPP amplifier, the rear 6j1's form the phase splitter.

Yeah, specs are being adjusted. The Yaqin MS-2A3 used to be 2x 14W on 8Ω and now it's stated as 10W in the new catalogue.

I wish they'd make special editions that were point to point and had upgraded capacitors, etc...the way the re-badgers order them. The re-badgers crack them open on their youtube channels and it's high-end point to point inside w/ top capacitors, so Yaqin is able and willing to do it right. Why not offer multiple versions to satisfy demand? If they can make a good amp for $458 that needs $400-500 in upgrades, why not just charge $1000 for an SE version? I guess it's too much to ask for.

Yes...like with MHZS cd player last year,claiming they developed e very new chip but in fact it was well known chip just hiden in a special box with company name on it - MHZS....such games are for china managers still some kind of flert with buyers...slowly they realize how dangerous can be such behaviour.......sorry if this is a bit off topic

2x10W is still too optimistic for 2A3 tubes, but this is definitely move in the right direction.

I do not understand your desire for point to point wiring. Good quality PCB is always better and more reliable in manufacturing of any volume other than a single unit.

I think I get what you're saying, but assuming they do quality control (like in that Jolida.net factory video) then mass production of point to point shouldn't have issues, as I'm sure they don't for re-badgers who get them w/o PCB. Anyway, like FineArts i don't wanna go too off topic. Sorry. Just wanted to vent a little.

I went ahead and tried swapping some caps in the MS-20L. I replaced the four .22mF coupling caps with ClarityCap ESA ($7.90 ea) and the two .47 shunt (bypass) caps coming off the grids in the preamp with Solen FastCaps ($1.65 ea).

It did make a difference, not huge but a bit more clarity and the channel separation is a bit cleaner.

I seriously doubt that using "high end" caps that cost $50 or more each would make it better. I have changed a lot of caps, particularly in crossovers, and IMHO swapping a $5 or $10 cap for a 50 cent cap put in at the factory usually makes a difference. But spending more than that for capacitors doesn't really make more of a difference. The law of diminishing returns I guess.

I plan to keep the new caps in the amp, I like the sound.

Despite new capacitors this amp still sounds somewhat thin and flat...would 4 JJ EL 34 make any improvement ? or more omprovement can be achieved with 8 matched russian 6J1 P-EV?...I am asking that because I could buy new JJ EL34 very cheap

The output transformers are probably the weakest link in these Chinese amps. I added a sub to my setup and am quite happy with the sound now.
If you can get the JJ's at a great price, I say try 'em. I'm currently using all Russian tubes in mine.