Forgot to mention -- the Sylvanias I'm asking about are black plate NOS... Thanks again.
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Ming DA MC 84C07 tube recommendations - Page 3post #31 of 677/18/10 at 2:14pmThread Starter
Head-Fi's Best Sellerspost #32 of 677/18/10 at 4:42pmpost #33 of 677/18/10 at 6:15pmThread Starterpost #34 of 677/21/10 at 7:57pmThread Starter
Just swapped out the stock Chinese 12AX7's with the Sovtek 12AX7LPS. Huge difference! I'd say a little more noticeable than when I put in the JJ EL84's in place of the stock Chinese EL84's...post #35 of 677/23/10 at 5:30pm
So I wrote Mingda to inquire about the cats eye tube, and here is the reply:"About your problems of the cats eye, you could use some black things to cover it. Or you could remove the cats eye, it will not affect the function of the amp. The amp could also work perfectly."
I am on vacation right now, but will try it when I get home. Hope that is helpful to those interested. Peterpost #36 of 677/24/10 at 8:38amThread Starter
What does rectification due anyway? Will removing it negatively affect the sound?
I'm currently waiting for Sylvania EL84 black plates but I'm currently loving the JJ EL84 _ Sovtek 12AX7LPS combo. I was going to look for Sylvania 12AX7's but I think I'll stop with the EL84's for now and just focus on some new cans or upgrade the portable set-up (improving my desktop set-up to a mid-fi-ish set-up now makes my 5th gen iPod+Ety combo sound lacking and sometimes harsh...).post #37 of 677/24/10 at 8:41ampost #38 of 677/24/10 at 8:49am
It converts AC to DC. The opposite of converting DC to AC is called inverting.
Like Skylab said, if it truly does rectify in the amp, removing it will do bad things--most likely just blowing a $2 fuse. However, I've read a few threads about some tube amps that use tubes as only eye candy and they aren't at all in the circuit. It's a shame. But I always thought the Ming Da amp was a good one. That statement makes me wonder.....
post #39 of 677/24/10 at 9:07amThread Starterpost #40 of 677/24/10 at 9:10am
An easy way to tell if it rectifies is to open up the amp and look for a solid state rectifier.
post #41 of 677/25/10 at 9:00pm
I'm listening to the MD amp with K701 and playing Harry Connick Jr, "She" album right this minute - The K701 and this amp is my preferred matchup - I still use the BCL for a change of flavor - but the tube combo always sounds more natural to me - no false detail elevation - which I believe the K701 is inherently guilty of.
I am still on the stock tube compliments, can't wait to roll the best tubes money can buy - when my finances recover from the recent wall street massacre of my finances. From what you guys tell me it will be well worth it.
I just pulled the cat eye tube while music was playing and it doesn't affect playback.
Regardless the main reason I purchased this unit is for its over spec (for can use) power supply - able to drive up to 5 watts into 8 ohms (probably exaggerated). The PSU is the most important thing in a tube amp. The LCD-2s are the prime target for my MD - they should have more than enough current to drive the low resistance necessary.
To sum up - the MD is a class A single ended tube amp with a massive power supply (the unit is 7kg heavy for this reason alone). Most tube amps twice the price will not have such a substantial PSU.post #42 of 677/26/10 at 1:26pmThread Starter
Hey SP Wild - I actually find it remarkable that you like the Ming Da with only the stock tubes. Maybe it has something to do with the fact that you have a better source and a really good DAC?
Only after I swapped out the stock tubes did I start really liking the sound. I still switch to the Matrix M-Stage (which I guess is comparable to your BCL) sometimes -- also for the same reason as you do (i.e. a change of flavor). I think that the Ming Da with the Sovtek 12AX7's became closer to what I think is neutrality in the M-Stage, but with a warmer, smoother and more natural sound. The Chinese 12AX7 seemed really colored -- and not in a pleasant way. Prior to putting in the Sovteks, the sound often became harsh for some songs also. And before, I thought it was the recording or my compressed files...post #43 of 677/27/10 at 2:54am
Sure the Dac is somewhat bordering exotica and the MD is reaping benefits - then again so is the BCL. It's not perfect by a long shot, there seems to be some treble refinement issues (possibly countered by the smoothness of a hi-end dac?) but I guess I just find tube euphony very pleasant, cheap being better than none. Perhaps there is something about 3rd order harmonics that my brain decodes as closer to a realistic sound applicable explicitly to the midrange as tubes don't sound as realistic as solid state in the frequency extremes.
I am leaning towards a doctrine of tubes for mid level cans replaying average recordings. Solidstate for high-end cans playing top level recordings - of course, without a top level tube amp to experiment with I am merely entertaining fantasies.
Hey, but I'm glad the MD is working out for you - at least you know you can tune the sound to match other cans if you choose. Tube headamps led me to purchasing a tube integrated for my speakers - a novelty, tubes are not. For whatever reason - if you've ever jammed with acoustic instruments with band members - it's easy to recognise that tubes for whatever unknown scientific reason projects the sound more realistically than solid state (nylon string classical guitar eg). Technical types really shouldn't be condemning them based on measured data.post #44 of 677/27/10 at 10:33amThread Starter
Hey SP Wild, my experiences are different. I play the piano but not an electronic keyboard, electric guitar or not any instrument that requires amping. So I'm really just a humble listener as far as music goes. :) I'm not technical either (not with audio anyway).
I've been using the MD more often lately. I already loved it with the JJ EL84's and Sovtek 12AX7LPS's. I just got Sylvania EL84s -- grey instead of black. A mistake was made in shipping me grey plates instead of black but I decided to keep the tubes (was offered a significant discount for the error) since they sound great anyway -- noticeably different and better than the JJ's -- like a fuller (or "fatter"?) sound.
Tube rolling is interesting. The different tube combos really changed my K701. I actually still like the JJ's, and will probably roll them back in every now and then. I think they're a great value if you don't want to bother with NOS tubes (in my case, the JJ's were free, compliments of Pacific Valve).
I'm actually tempted to sell the M-Stage at this point, but I'll hold on to it for now and listen to more songs on it. Also, the M-Stage is my only desktop SS amp and the MD is my only tube amp, so maybe I should probably hold on to both for now unless I find anything better...
With my value/budget SS and tube amps, I think I'm done with amps for now and will just do more listening than analyzing. :) A decent DAC will be a good next assignment. But prior to that, I'm likely to get another high-impedance can first (maybe a Seen for a different perspective?). Or maybe upgrade my portable set-up...
Thanks everyone for all the help!post #45 of 677/27/10 at 7:41pm
Hey a piano player. Cool.
I have found the acoustic piano to be a much harder challenge to audio reproduction than other instruments - for that matter I feel solid state is in fact more able to replicate a piano than tubes. I find the solid state driven D7000 the best combo for piano keys - I think you ought to save up for the next tier of cans (LCD, HD800, T1) - they are definately more able to accurately recreate a piano strike than mid-level cans. I also think you should retain your matrix - as it does have its own advantages over tubes - it theoretically is a hi-end amp, the design of which was chosen to debut the HD800 to the world.
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