Nobsound Mini Bluetooth Power Amplifier Stereo Hi-Fi Digital Amp 2.0 Channel 50W×2 with AUX/USB/Bluetooth Input Wireless Audio Receiver PC Sound Card with Power Supply (Black)

Product Information

They could have very easily been honest and up front with this product, and they would have been successful. They look to be packed with features and a cursory glance at youtube shows a guy who loves the entire line and thinks that they’re plenty powerful. Given the fact that the connectors aren't hand wired and are soldered onto the PCB correctly this leaves a few conclusions. There is only one power transformer under the box, which delivers 17V to output transistors, 7V to microchips and 6. This is interesting as I used a signal generator with my standard HD650 XLR-4 cable and looked at the phase on my Rigol DS1054 oscilocope and pin for pin the input and output are in phase.

I applied the variable signal 2B to the input of the amplifier and looked where it comes to when the 6n1p and 6p15p lamps were removed. Rubbish Chinese amps like this one are getting rarer - the majority of them now have excellent build quality and aspire to be a hi-end product. Where does the signal on the cathode 6n1p and on the cathode and anode 6p15p comes from, if the signal comes on the 6n1p grid only when tubes are removed? However, in this case it is safe to assume that the actual distortion that occurs inside the speaker will be magnitudes higher than the specs shown on the Nobsound data sheet since it is lacking the output filter.From my experience any decent vintage amp/receiver from 70s is much much better then any Chinese class D amplifier. There is general consensus in the audio world which of the pins are assigned to a signal as used by HIFIMAN for instance. The cheapest amplifier with just analogue inputs that I would be willing to risk my money with is probably the 2x100 watt Sony STR130. It all started with those counterfeit semiconductors which appeared at around the same time as Chinese made valves (around 25 years ago).

Update: I just read Veri's and others' earlier comments in this forum re the poor performance of this amp. One is a passive 2in1 RCA switchbox with volume control which bleeds the two inputs and is thus unusable. Reddit and its partners use cookies and similar technologies to provide you with a better experience. I can safely say, 100% goods sold are fake (not cheap) and they do it openly, and authority don't care.On topic, I've also heard some excellent sounding Chinese gear like Ming-Da and Line Magnetic (have an LM dac myself) and have built gear using affordable (not cheap) Chinese line transformers, plate chokes etc. Afghanistan, Albania, Algeria, American Samoa, Andorra, Angola, Anguilla, Antigua and Barbuda, Argentina, Armenia, Aruba, Australia, Austria, Azerbaijan Republic, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Bosnia and Herzegovina, Botswana, Brazil, British Virgin Islands, Brunei Darussalam, Bulgaria, Burkina Faso, Burma, Burundi, Cambodia, Cameroon, Canada, Cape Verde Islands, Cayman Islands, Central African Republic, Chad, Chile, China, Colombia, Comoros, Cook Islands, Costa Rica, Cyprus, Czech Republic, Côte d'Ivoire (Ivory Coast), Democratic Republic of the Congo, Denmark, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Ethiopia, Falkland Islands (Islas Malvinas), Fiji, Finland, France, French Guiana, French Polynesia, French Polynesia, Gabon Republic, Gambia, Georgia, Germany, Ghana, Gibraltar, Greece, Greenland, Grenada, Guadeloupe, Guam, Guatemala, Guernsey, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, Hong Kong, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Japan, Jersey, Jordan, Kazakhstan, Kenya, Kiribati, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Macau, Macedonia, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Mexico, Micronesia, Moldova, Monaco, Mongolia, Montenegro, Montserrat, Morocco, Mozambique, Namibia, Nauru, Nepal, Netherlands, Netherlands Antilles, New Caledonia, New Zealand, Nicaragua, Niger, Nigeria, Niue, North Korea, Norway, Oman, Packstation, Pakistan, Palau, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Puerto Rico, Qatar, Republic of Croatia, Republic of Cuba, Republic of the Congo, Reunion, Romania, Russian Federation, Rwanda, Saint Helena, Saint Kitts-Nevis, Saint Lucia, Saint Pierre and Miquelon, Saint Vincent and the Grenadines, San Marino, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, South Korea, Spain, Sri Lanka, Sudan, Suriname, Svalbard and Jan Mayen, Swaziland, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Turks and Caicos Islands, Tuvalu, Uganda, Ukraine, United Arab Emirates, United States, Uruguay, Uzbekistan, Vanuatu, Vatican City State, Venezuela, Vietnam, Virgin Islands (U.