atmasphere
Responses from atmasphere
| Hi pitched hum from TT pre-amp? The complaint sounds like a microphonic tube. | |
| Tube amp rough guidance sought B&Ws in general are not tube-friendly, although the 805s are probably one of their easier speakers in that regard. The room size is important- the 805s are not particularly efficient.BTW if you want speakers that are easy to afford, easy to dr... | |
| 3 preamps with transformer hum, DC on the line? Its easy enough to eliminate DC on the line. If you have DC, it can cause toroidal transformers to become noisy as the core of the transformer will saturate with very low DC levels. Such DC filters should not adversely affect the bandwidth of the ... | |
| Tube Pre/Monoblock Recommendation Bhoage, the Merlins get a lot of use with OTLs- and I think its safe to say that the Merlins were designed with that sort of amplifier in mind. | |
| World's best Pre-amp for $10K and above? Grannyring, OK- I have to admit that I run into engineers that rely entirely on specs. Decades ago I used to work at Sperry Corporation on something called the Eagle Project. What I saw there is borne out in my own experience- that an engineer tha... | |
| Tonearm or headshell for Empire 208 Jazzerdave, I've done a lot of work with that 'table.The cartridge clip is NLA and the hardest part to find. Although the 'table is a good design, its arm is lacking compared to modern designs, and you would do well to do something to damp the pla... | |
| Class A, 6SN7 pre amp with zero feedback The 12AU7 and 6CG7 have very similar characteristics to the 6SN7, in fact the 6CG7 is the exact same plate structure as some NOS 6SN7s. But 6SN7s usually sound better, I think its because of the base, which is less microphonic. | |
| What are OA2 tubes and why are there more gear OA2s work much the same as Zener diodes but have a set of issues that I would think would make the Zener a preferred design means. One of them is that the tube makes noise when it fires (which is continuously) so you have to bypass them and isolat... | |
| World's best Pre-amp for $10K and above? You might engineer a plane but it still has to be test flown. Yes, we do a lot of listening. Human hearing rules are not well accepted in the audio industry (how's that for a conundrum) so test equipment does not tell you everything. | |
| World's best Pre-amp for $10K and above? You can tailor the sound through the topology. For example, a purely-single-ended design will exhibit a 2nd order harmonic distortion which will give it a rich sound. If no feedback is used, it will not be harsh until pushed hard, but will feature... | |
| Ultrasonic Oscillation One other thing to look at is corrosion on the ground contacts of your RCA connectors. That can toast tweeters too. | |
| EL34 tube monoblocks that doubles power at 4 ohms You might want to take a look at this:http://www.atma-sphere.com/Resources/Paradigms_in_Amplifier_Design.php | |
| World's best Pre-amp for $10K and above? Solder: use a eutectic type to avoid bad solderjoints- pay attention to the alloys as they have different uses depending on the connection. IOW there is no one best solder for all solderjoints, but this is an engineering issue, not a matter of tas... | |
| World's best Pre-amp for $10K and above? The circuit should work the same regardless of the cap. Once it works, then the choice of cap is not for 'voicing', which is a tonality issue, but which one can bring out more detail (which, BTW, it should do in any circuit).IOW, any given cap sho... | |
| Amp preamp impedance matching...can anyone explain? Bifwynne, that is a common problem if you are trying to use a balanced preamp with a subwoofer. Many subs only have SE inputs.Another solution is that Jensen transformers makes a transformer that is optimized for subwoofers. It has a fairly high i... |