- Brand Name: Ming Da
- Model Number: MC-5S
- Type: Home Amplifier
- Channels: 5
- Place of Origin: Guangdong, China (Mainland)
- Color: black
- output power: 70WX2
- Output impedance: 6Ω,8Ω
- input impedance: 100K
- input voltage: 1000mv
Packaging & Delivery
|Packaging Details:||packed in two thick and solid boxes outside and with soft and thick EPE foam inside the boxes to ensure the delivery safety.|
|Delivery Detail:||within 15 days|
MC-5S home theatre five channels power amplifier
Output power: 70W x 5
Input sensitivity: 1000mV
Signal-to-noise ratio: 95db
Output load impedance: 6ohms, 8ohms selectable
Input jacks: 5 groups
Input impedance: 100Kohms
Frequency response: 20Hz - 60KHz +/-1db
Total harmonic distortion: <=1%
Vacuum tubes: Ming Da KT90 x 10; ECC82 x 5; ECC83 x 5
Power consumption: 620W
Volume: 73x51x38 cm (LxWxH)
Voltage Standard Available: 110V, 220V, 230V, 240V
Color Options Available: Black
Heavy weight Stainless steel and alloy plate construction
Custom built audio and power transformers using:
Zll and H18 long grain annealed and directed steel sheets
Hand built with alll hand welding internal connections
USA made Teflon silver cable for audio signal paths
High-end parts - Philips, Panasonic capacitors, USA made resistors
Ming Da KT90 x 10 as power output tubes
Gold plated speaker out terminals
Attractive stainless steel & Plexiglas valve cover
Detachable power cord system
MC-5S Five channel on Magazine
Packaging&shipping ,Trade terms
Why Choose us?
Ming Da products from the Meixing Factory ,One of the most specially producing valve amplifier in china .The factory opened in 1991,which has a complete range of production equipment for making our own transformers and chassis components.
Our products are exported to more than 20 countries around the world.
Q1: Why use a tube amp?
A1:Tube amps have always been the amplifier of choice for the working musician. Musical myth has ascribed almost magical tone to them. While the results may not be entirely magic, tubes do have a sound that is different from solid state amplifiers, and one that happens to make amplified music sound better to the human ears and brain. There are lots of technical and psuedo-technical explanations for why this should be true, but there is enough solid evidence that it is a real effect to trust it. The real reason to use tube amps is simply that they sound better. For that advantage, we put up with the poor supply of parts, high prices, fragility and excess heat that they produce.
Q2:How long do tubes last? When should I replace my tubes?
A2:It depends heavily on use. In a closet, the tubes will last forever, of course. For practice in a bedroom a couple of times a week at modest volumes, you'll probably get five to ten years out of them. If you practice twice a week for a couple of hours at full volume and play two gigs a weekend, count on one to two years out of a set of output tubes. Note that this assumes that you got good ones to begin with and that you had them properly biased when they were put in.
Tubes wear out by sheer hours of being turned on, by how hard they're worked, how hot they get from just the heat in the box, by the number of times they're turned on and off (thermal shock). Notice that being played at maximum warp into a dummy load (or power brake, or attenuator, etc.) counts as being played hard, and that because you can't hear all the sound, you may not think that you're working them hard.
Your ears tell you when to replace them. When they no longer sound quite as punch and sweet as they used to, start thinking about changing them.
Q3:What is "bias"?
A3: "Bias" in this context refers to the amount of voltage held on the grids of the output power tubes. This controls the amount of current the output tube(s) conduct exclusive of the signal current, or, looking at it another way, the amount of overlap where both tubes are conducting simultaneously.
Q4: When should I bias my amp?
A4:You should re-bias the amp whenever you change power tubes or modify the power amp circuits.
Each power tube needs a certain bias current to keep it operating at the point where the amount and type of distortion under normal conditions is well controlled. Individual tubes vary widely in the grid bias that sets the correct idle bias current. If you change tubes or tinker with the circuit, you need to make sure the tubes are set back into operation in a way that sounds good and does not cook the tubes.
Amps typically provide only one adjustment point for bias, assuming that you will have bought matched sets of power tubes.
It is possible to modify your amp to "match" unmatched tubes by setting the bias voltage and AC drive level of each tube individually. This may require some serious soldering, though. See section D. below for a discussion on matching, and the mods section for what you have to change.
Q5:How do i bias my amp
A5:CAUTION CAUTION CAUTION !!!
Keep in mind that tube amps use high voltages, and they can *kill* you if you don't know whatyou'redoing. So, if in doubt, leave the job to a qualified technician.
How do you correctly bias an amp? There a few different approaches but first hook up a speaker or a passive load to the output and remove any input signals; tube amps need to have a load or they can sometimes become unstable. Check and make sure the proper size fuse is installed.
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