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Posted 20 hours ago

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)

£9.9£99Clearance
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About this deal

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. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.

As such I would bet this amp does not meet the FCC Part rules section 15B which is a requirement by law and as such most likely is even illegal to distribute in the US. When connecting long speaker wires, there will be lots of unwanted EMI radiated since this receiver is outputting the high-frequency signal without any low-pass filtering (except for some small ferrite beads).There was reported that Russian tubes sound much better, and the tubes with golden grids make the best sound. New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging .

Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true).

Vintage amplifiers usually have more “fun” in the sound, mainly due to far from flat frequency response and THD levels. I can safely say, 100% goods sold are fake (not cheap) and they do it openly, and authority don't care.

By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. The second picture shows the measured output signal with no speaker load attached while streaming silence. Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item.It all started with those counterfeit semiconductors which appeared at around the same time as Chinese made valves (around 25 years ago). Me and others were not so lucky, I can only conclude there is very little quality checking on these. Normally tyhere is an output lowpass filter which removes those switching components and only leave the audio signal. It warns that not having this output filter could damage the speaker voice coil and also the EMI could have negative impacts on nearby devices. When I brought this to their attention, they sent me a new faceplate with "Nobsound" on it but no "E-600.

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