When manufacturers measure amplifier dirtortion they usually measure distortion by adding a low-pass filter after the Class-D amplifier. When I brought this to their attention, they sent me a new faceplate with "Nobsound" on it but no "E-600. 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.

It all started with those counterfeit semiconductors which appeared at around the same time as Chinese made valves (around 25 years ago). After being lived in Shanghai for a year, my experiences just put me off that anything is made in china, especially Chinese brand. 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. Class-D amplifiers work by switching the output between ground and the supply voltage at a high frequency. I have also enclosed a picture of the output waveform with a 4 Ohm load connected to one of the outputs when driving the amplifier with a sine signal.The second picture shows the measured output signal with no speaker load attached while streaming silence. There was reported that Russian tubes sound much better, and the tubes with golden grids make the best sound.

Reddit and its partners use cookies and similar technologies to provide you with a better experience. A circuit diagram is very difficult to draw, because the circuit is on both sides of the board and the details are too small.

Sadly unable to use currently and test performance, the item requires an external power source of a voltage I don't have, have to try source suitable power source,, disappointed item wasn't supplied with this important piece of the package to work, item seems robust and solid enough, good quality appearance and build, but until power adaptor sourced unable to judge performance,sad the adaptor not included. I can understand them skimping on transformers which are costly devices, but the rest of the chassis is full of circuit boards, so why not just make a proper valve amp out of it to begin with? One is a passive 2in1 RCA switchbox with volume control which bleeds the two inputs and is thus unusable.

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. The cheapest amplifier with just analogue inputs that I would be willing to risk my money with is probably the 2x100 watt Sony STR130. From my experience any decent vintage amp/receiver from 70s is much much better then any Chinese class D amplifier.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? 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. 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. Finance is provided by PayPal Credit (a trading name of PayPal UK Ltd, Whittaker House, Whittaker Avenue, Richmond-Upon-Thames, Surrey, United Kingdom, TW9 1EH). StereoNET (Australia) is part of an international network of publications owned wholly by Sound Media Group (Australia).

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. Probably because the one amp is the basis for many many amplifier types that all look different when under the bonnet it's just the same SS amp. First of all, every speaker handles high-frequency signals differently since a speaker is designed to be driven with signals at frequencies below 25 kHz.Normally tyhere is an output lowpass filter which removes those switching components and only leave the audio signal. 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. C: An early production unit may have been designed with a swap and a (siltently) revised PCB has been used after the manufacturer found out.