atmasphere
Responses from atmasphere
| new GAN amplifier @atdavid is correct. By the time anyone had modified a MOSFET amp to run with BJTs it would be an entirely different amplifier. There simply would be no way to compare 'before' and 'after'. Its highly unlikely that anyone ever did a mod like this ... | |
| The sound of electrolytic capacitors failing Depending on the severity of the failure it can manifest in several waysIncreased humless bandwidth extension in either direction (this is due to the audio circuit interacting with power supply components that it normally would not) and less detai... | |
| Phono Preamp Tube Rush the only reason I raised the issue of Johnson noise was in response to a question about whether any tube-based phono stages are quiet enough for hiss to be inaudible when one’s ear is placed against the speaker, while a record is not being pla... | |
| Looking for inexpensive preamp FWIW detail can easily exist without brightness. Do you need a phono section? | |
| Help with a mystery vintage amp head No. The jacks and the pots are used to set the bias on the power tubes. It requires that the 1/4" plug be connected to a meter; without seeing the circuit closer I can't say if it would be set to DC volts are DC amps, but in the end you set the me... | |
| Phono Preamp Tube Rush I then extrapolated from that number to the result corresponding to the 12 ohm resistance of my cartridge, over a 20 kHz bandwidth:@almarg Most LOMC cartridges have bandwidth well past 20KHz- most have no worries going to 40KHz.if executed in the... | |
| Phono Preamp Tube Rush I would like just a little more gain for ultra low output cartridges and I believe from what I have read that a balance design should have lower noise levels. Cartridges are balanced to begin with.The reduced noise can be significant. For a give... | |
| Are most recordings so bad it's not worth spending large on speakers? Are most recordings so bad it's not worth spending large on speakers?The simple answer is 'no'.There are many gems. The better your system, the better those gems sound. | |
| Help with a mystery vintage amp head It'll probably be great for blues.But if the restoration goes well then it might sound a lot like a Fender with better low end. This is just based on the size of the output transformer. | |
| The sound of electrolytic capacitors failing @erik_squires A bad filter capacitor won't take out power transistors but it should damage the power *transformer*. | |
| Help with a mystery vintage amp head That's an instrument amplifier. I would not try to run it until the filter capacitors have been replaced. This amp was probably made in the mid 1950s. | |
| Phono Preamp Tube Rush I have never heard an ARC phonoamp with "tube rush." I think you will find that ARC uses semiconductors at the input of their circuits as well. | |
| Sound pressure level and Room size for ESLs I am assuming that you will lose some bass frequency to the voids.I don't see why. Larger rooms shouldn't be any worse with bass. Standing waves are always an issue and are a problem in large rooms as they are in smaller rooms. | |
| Devore Nines and amp match MY PL does a surprising job of powering difficult speakers (4 ohm, 3.5 min), and I’ve compared them using 100 W ss. With the tubes the bass had less impact...slower and not as well defined, and a pretty drastic reduction in sound stage (dynamic... | |
| Can an IC based amp be considered 'high end'? So, do you go for 'high end' or do you favour some of those criteria over others?I'm a manufacturer. So my criteria might be a bit different, but I'm also an audiophile. We all like to think we're getting good quality and we try to search for it; ... |