I guess who are we to judge if someone prefers inaccuracy? If it sounds "good" to you and you enjoy it then that is the point to why we listen to music anyway right? At the very least call a spade a spade and say "Hello my name is Captainbeefheart and I like distortion". The defacto "tube amp" has become a smoke and mirror effects box to add to the analog information embedded into the original content creating new information content (distortion) misconstrued by the untrained ear as an improvement. Some members in my other audio groups also noted how "full" the bass was. Think the Crimson 275 debacle, people reviewed it as having thundering bass etc. I half think it's intentional, they know they need their amps to stand out against the crowds so what better way to get it then output transformer saturation for large 2H distortion at low frequencies, hello free bass information and also the high output impedance gives the boomy one note bass at resonance. I do find your statement about commercial tube amps being for the most part a regression rather than a progression spot on. I eagerly await Amir to get a decent tube amp to measure to put the whole "tubes make distortion" myth to rest, to me it's more tube makers are afraid of feedback for some reason and that's the downfall not the fact they use tubes.Ĭlick to expand.Hello SIY, I agree the Berning circuit isn't the silver bullet but I find it refreshing that someone took relatively old technology by today's standards and got rid of the output transformer. Must be a pretty huge markup with some of these awful amps on the market giving tubes a bad name. I find it odd a nobody like me with little effort can get much better specs than these amps selling for thousands of dollars where I on average spend $500 for my builds. I am not saying tubes are better or worse, everything has it's pros/cons but I admit I just use tubes because I find them funner to build with and nothing else. I'd love to give Amir some amps I have made as they perform FAR better than the majority on the market because I don't copy old designs and I'm just a nobody with a desire to use tubes for no apparent reason other than I like them. We still use TWT in space communications so tubes are still top dog in many applications. ![]() ![]() So how is it here we are in 2022 and tube amp manufacturers are still just copying resistor loaded circuits from the 40's and 50's? I have been lately researching the David Berning circuit for his bridged output impedance converter which removes the worst part about the tube circuit, the output transformer. Part of the issue I believe is many of the tube companies don't want to spend the time to work out the compensation networks, I test so many tube maps with awful ringing that can be fixed with some simple control theory application. For example do you see many transistor amps that use resistive loads? No, they use high AC impedance loads like current sources, so load tubes with appropriate high impedance loads and you'll notice a substantial decrease in distortion. This is original circuit with zero help from many decades of experience. For example the original Mullard circuit can get 20 watts output with. I have looked but I haven't seen one well designed tube amp reviewed here, I think that needs to change in order to show good performance can be had with tubes. ![]() The problem with tube amps is the output transformer typically limits us to <30db of negative feedback which if you take enough care to make the open loop circuit linear enough should be plenty to get very low distortion. My concerns are that why people make such blanket statements about active devices, certainly most of us should know by now that with enough open loop gain we can achieve fantastic numbers regardless of type of active components. ![]() Hello to everyone, I really enjoy Amir's reviews and appreciate everything he does for the community.
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If more than standardized amount of noise is not corrected in time, certain undesired situations could happen. If the EI value exceeds the standard demonstrated above, a corrective action needs to be conducted in order to maintain the proper functioning of the CR system, ensuring that the best possible image quality could be provided. Another example can be that the CR system is not properly quality controlled. There are some sources of error which can lead to a failure of the dark noise test, such as little damages to the imaging plate. Since the obtained EI value fell into the standard set by the manufacturer, the CR system in the lab passed the quantitative criteria. In this lab, an EI value of 20 was obtained. 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Thus, the purpose of dark noise test is to assess the level of noise inherent in the system since excessive noise in the plates can compromise image quality (Muhogora, Bonutti, Kazema, Padovani, & Msaki, 2011). The dark noise test measures the erasure efficiency of the imaging plate and the CR system (Desai & Valentino, 2011). Therefore, the less the dark noise is, the better the image quality will be. During the reading process of an image, a certain amount of noise would be unavoidably produced. In the imaging plate, with attenuated X-ray photons first converted into light by the crystals, a radiographic image could be created. CR employs phosphorous crystals to produce an image. Similar to the “snow” on the television screens which is inherent in the design of a video system, dark noise is also inherent in a computed radiography (CR) system. 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