Author Topic: Yaqin Tube Amps (Read 49108 times)

JojoD818 · « **Reply #90 on:** Jun 09, 2013 at 07:06 PM »

wala ba under-chassis pics yan?

chiryu18 · « **Reply #91 on:** Jun 09, 2013 at 08:26 PM »

Quote from: JojoD818 on Jun 09, 2013 at 07:06 PM

wala ba under-chassis pics yan?

meron sa net, d ko pa kasi binubuksan kc 4days palang sa akin

docrob · « **Reply #92 on:** Jun 09, 2013 at 10:38 PM »

bring it to the store asap and demo the problem to them, under warranty pa pala yung tube amp mo they should do something about it

good luck

rochie · « **Reply #93 on:** Jun 09, 2013 at 11:43 PM »

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The 100B has separate power supplies and circuits for left and right channel - it is in fact supposed to be 'dual mono'. Therefore there should absolutely not be 'crosstalk' with this model. If however you mean that their is 'leakage' between preamp inputs then my advice would be to use the front sockets (which are better anyway) and use either a passive or active preamp (passive preamps are cheaply available and work well due to the 'high gain').

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I also get crosstalk but I have to pump up the volume to it's max. I mention this a while ago and there were some Yaquin users that also had the same. Nothing to worry...

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My 100b has no cross talk at all. My old MS-20L did

sagot sa akin nung nagtanong ako about your problem sa FB group ng Yaqin.

mukhang hindi lang sa isang model lumalabas yung problem na to pati sa ibang model meron din, luckily my yaqin mc10t doesn't have crosstalk at all.

chiryu18 · « **Reply #94 on:** Jun 10, 2013 at 08:31 AM »

Quote from: rochie on Jun 09, 2013 at 11:43 PM

sagot sa akin nung nagtanong ako about your problem sa FB group ng Yaqin.

mukhang hindi lang sa isang model lumalabas yung problem na to pati sa ibang model meron din, luckily my yaqin mc10t doesn't have crosstalk at all.

wala kasi sila nung mc10t, tsaka habol ko kasi dito sa mc 100b is yung kt88, yung susunod kasi na amp na naka kt88 hindi na kaya ng budget.

rochie · « **Reply #95 on:** Jun 10, 2013 at 08:42 AM »

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There can be crosstalk problems on the inputs with the 100B, I have experienced it a little myself. It has come up before & as already stated it’s often at high volume or on inputs with high gain. It’s due to the rotary selector switch. It’s a more common problem than many people may think, but an easy solution is to ensure anything connected to other inputs is turned off while you listen to the input you wish to use.
I don’t consider it an issue, more of a fixable annoyance.

eto pa isang reply nung mga friendly guys from the Yaqin FB group. if you have an FB account(w/c i doubt if you don't

) try to look for the group, madami ka doon matututunan, and the guys there are friendly. andun din si Les Carpenter who wrote the guide in modding the mc10L.

ATJr. · « **Reply #96 on:** Jun 10, 2013 at 10:36 AM »

some designs short out any input that is not selected, the shorting resistor can be a 10k 1/4 watter....
due to the high input impedance of tubes, this thing can and do happen sometimes....

ATJr. · « **Reply #97 on:** Jun 10, 2013 at 10:46 AM »

Quote from: rochie on Jun 10, 2013 at 08:42 AM

eto pa isang reply nung mga friendly guys from the Yaqin FB group. if you have an FB account(w/c i doubt if you don't ) try to look for the group, madami ka doon matututunan, and the guys there are friendly. andun din si Les Carpenter who wrote the guide in modding the mc10L.

eto pala yon....https://www.facebook.com/groups/235849143332/

rochie · « **Reply #98 on:** Jun 10, 2013 at 04:39 PM »

Yes sir Tony that's it.
if you guys own a yaqin I suggest you follow that group madami din tips and suggestion doon and reviews ng mga different tubes na ginamit nila, but most of the guys are from UK and some from Australia and New Zealand.

praktikal · « **Reply #99 on:** Jun 10, 2013 at 05:05 PM »

Di pala magandang mag tie-up ang Yaqin at Apple... Hehe....sorry po sa ot.

JojoD818 · « **Reply #100 on:** Jun 10, 2013 at 07:31 PM »

fixable annoyance... well they should have fixed that up in the first place before letting them amps out the door...

ATJr. · « **Reply #101 on:** Jun 11, 2013 at 05:42 AM »

materials degrade over time, there is a good reason for using ceramic types on rotary switches...

JojoD818 · « **Reply #102 on:** Jun 11, 2013 at 06:06 AM »

yes they do, but to cause crosstalk? I seriously doubt it... loose connection pwede pa...

ATJr. · « **Reply #103 on:** Jun 11, 2013 at 06:46 AM »

ever heard about surface resistance caused by air pollution?
soot has that funny way of getting inside amps and depositing
themselves in places we do not want them....

JojoD818 · « **Reply #104 on:** Jun 11, 2013 at 10:51 AM »

so you think that's what causes the crosstalk?

but shouldn't that cause degradation of the signal instead of jumping around the place?

anyway, I hope they get fixed.

Gino · « **Reply #105 on:** Jun 11, 2013 at 02:13 PM »

I'm guessing that if soot affects your sound, you have more urgent things like your health to worry about.

ATJr. · « **Reply #106 on:** Jun 11, 2013 at 02:55 PM »

Quote from: Gino on Jun 11, 2013 at 02:13 PM

I'm guessing that if soot affects your sound, you have more urgent things like your health to worry about.

yes this is also true....
tubes have very very high input impedance, in the meggohms range for as long
as the grid stays negative with signal...
i also encountered this cross-talk or signal leakage when i was starting out with tubes
about 40 years ago....

chiryu18 · « **Reply #107 on:** Jun 11, 2013 at 11:26 PM »

Took some pictures of the internal. Had to open the unit because I accidentally dropped the allen screw that was holding the grills in the bias pot.

chiryu18 · « **Reply #108 on:** Jun 11, 2013 at 11:33 PM »

chiryu18 · « **Reply #109 on:** Jun 11, 2013 at 11:34 PM »

chiryu18 · « **Reply #110 on:** Jun 11, 2013 at 11:35 PM »

chiryu18 · « **Reply #111 on:** Jun 11, 2013 at 11:37 PM »

chiryu18 · « **Reply #112 on:** Jun 11, 2013 at 11:39 PM »

ATJr. · « **Reply #113 on:** Jun 12, 2013 at 05:17 AM »

can you shoot the path from input jacks all the way to the input selector on the front panel?

chiryu18 · « **Reply #114 on:** Jun 12, 2013 at 06:35 AM »

Quote from: Antonio Tecson Jr. on Jun 12, 2013 at 05:17 AM

can you shoot the path from input jacks all the way to the input selector on the front panel?

cge sir

defcon3 · « **Reply #115 on:** Jun 14, 2013 at 06:07 AM »

check this also bro.....

"MAINS INPUT AND VOLTAGE SELECTION SWITCH
It was nice to see that metal structures carrying mains supply, like the mains transformer
mount, has its own separate Earth connection. There are no screen grid resistors on the
EL34's which I would have liked to see. Also the 4 channel inputs are still lumped together
which may give crosstalk problems. "

http://homepage.ntlworld.com/lez/YAQIN%20MC10/A%20LOOK%20AT%20THE%20YAQIN%20MC10L.pdf

ATJr. · « **Reply #116 on:** Jun 14, 2013 at 06:35 AM »

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Also the 4 channel inputs are still lumped together
which may give crosstalk problems. "

agreed, wires running parallel to each other forms a capacitor, that is the mechanism involved,
what i do in my builds is to use 2 conductor plus shield/screen cables, one for each input....

fyi, the sakura AV400 used a selector chip right at the input jacks so that cross-talk is not an issue..

jojod did a preamp build with relay input selectors sometime back...

deist · « **Reply #117 on:** Aug 01, 2013 at 02:01 AM »

I used to own a Yaqin VK-2100 & meron ding crosstalk, iba-iba pa levels kapag nagpapalit input selector

beringin · « **Reply #118 on:** Oct 23, 2013 at 07:51 PM »

Mga gurus. I have a straight solid-state set up and wanted to experience tube sound. Will the Yaqin CD2 buffer give me a tube sound or should i look for a tube preamp to get that experience. Thanks

JoeyGS · « **Reply #119 on:** Oct 24, 2013 at 01:57 PM »

Go tube preamp.

The buffer only 'matches' the preceding component with the succeeding component in its line level connection.

Quote from: beringin on Oct 23, 2013 at 07:51 PM

Mga gurus. I have a straight solid-state set up and wanted to experience tube sound. Will the Yaqin CD2 buffer give me a tube sound or should i look for a tube preamp to get that experience. Thanks