atmasphere
Responses from atmasphere
| Best Full-Function Preamplifier If you want the best, isn’t it better to go with a line stage and outboard phono preamplifier? @vonhelmholtz , @lewm beat me to the punch but the simple answer is 'no'. When the phono section is built in the designer has better control of the ... | |
| ? about Smoking Power Amp @mfiddles A dummy load is usually a high power resistor that won't fail when subjected to amplifier power. That way you can run an amplifier without having to listen to it. If run with no load you won't learn if the amp will hold up. Usually you'... | |
| ? about Smoking Power Amp @mfiddles D753 is a diode in series with the 10 Ohm resistor, R783. The screen for the resistor might be visible once you clean the board. This resistor is in the protection circuit and is not part of the amplifier circuit itself. So the amplifi... | |
| Generalized attributes of amplifier technologies I have a hard time believing 100K though. @tvrgeek our amps have all had 100KHz bandwidth but they are OTLs. The little 5 Watt amp I mentioned uses output transformers made by Edcor. The spec the transformer to 50KHz. But I measured the amp an... | |
| ? about Smoking Power Amp @mfiddles First you said: An orange tinge was visible through the grates of the amp producing the smoke. Just now you said: Yes I think I saw a tiny flame inside Which is it? If flame, then the amp cannot be trusted. If smoke and the am... | |
| Digital input amp This technology HAS NO DAC. @tvrgeek If this is so, then the amplifier is not also class D. Class D is a very specific class of operation. Since you apparently have a degree, then you know that class D was proposed in the 1950s and the first ho... | |
| 300b lovers @donsachs FWIW I was referring to an electrolytic cathode bypass cap. I wasn't very specific about that in my last post. | |
| Generalized attributes of amplifier technologies @tvrgeek Tube amplifiers do not have to be rolled off. A lot depends on the design of the output transformer. Harmon Kardon made the Citation series amplifiers back in the 1960s. Their Citation 5 had 100KHz bandwidth. Seems to me the Citation 2 wa... | |
| Digital input amp Not these designs. They take a bitstream , do DSP, do the digital conversion to PWM and feed the output. So the actual integrator and filter is the output. There is no DAC on their input. @tvrgeek What you are describing above means that ... | |
| 300b lovers But there are choices that affect the sound. If you need a 1 watt 1K resistor you can use any type on a cathode, but different types have different sounds. The cathode bypass cap might need to be 100 uF. Different 100 uF caps sound very differ... | |
| Need help finding spec. sheet, schematic, and or manual Do you need service? FWIW the schematic at the first link is adequate for any technician to service the amplifier. | |
| ? about Smoking Power Amp @mfiddles I think you lucked out on this one. Semiconductors are very unforgiving about abuse! If the amp still works, it means they were not damaged. It sounds like a resistor in the amp got really hot and burned off its coating but apparently th... | |
| Digital input amp They take a USB or other input. No DAC on the front end. Just the DSP engine to do volume, eq, etc, then whatever conversion to PCM to feed the class D output. So the only "DAC" is the output stage. @tvrgeek To be clear, the DAC is at the inpu... | |
| 300b lovers I wouldn't try mixing and matching Ralph's approach with ours. Ralph has his way of doing things, and his own unique taste in sonics, and we have ours. Most designers in this biz have a distinct "house sound" that they aim for, which results from... | |
| Why is solid state more popular when tubes are better? however for hologram sound nothing beats TUBES and not old crap from the 80’s but modern made gear. @luvharbeth That used to be true- no longer. You can now get that from class D if the designer did his homework, and just as smooth and relaxed ... |