atmasphere
Responses from atmasphere
| Working with 78’s @europeansoundtrack , @mke246 is giving very good advice. No 78 I know of uses RIAA EQ. In the late 1950s a number of preamps had several of the more common 78EQ curves built in. One of my favorites was the Harmon Kardon Citation 1. It also had sw... | |
| Digital input amp "Doubles the power when reducing impedance" So what. Any good amp can. "Switching, but not class D". OK, they did not say what it is though. "Exactly like class A" Nope. Not at all. "More efficient" Yea, so is class A/B, G, H and D. ... | |
| 300b lovers And the colorations from different part selections are not the same as SET. This makes sense when you reflect on it ... the balanced circuit is cancelling most, but not all, colorations, and the residue left over can be unwelcome and surprising. ... | |
| 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... |