atmasphere
Responses from atmasphere
Amp Shutting Down, need help Hm. You could certainly try it. Anything that might drop the voltage a little would probably sort it out. We have ascertained that the issue relates to overpowering the breaker due to something to do with the incoming AC power. It happens on any o... | |
Hi pitched hum from TT pre-amp? Sounds like your tubes are likely shot. | |
Amp Shutting Down, need help Jea48, thanks for that note. In that case, I suspect that the DC blocker circuit has developed a malfunction. It would not be missed if the AC line were clean.Its easy enough to test for. There is someone on this forum who makes AC extension outle... | |
Amp Shutting Down, need help I don't think the ground is the problem. Here is my theory:Right now I think there might be DC on the line. DC can cause a toroidal transformer to saturate. Now what if its not very much DC, less maybe only about .3 to .5 volts...In standby the am... | |
Hi pitched hum from TT pre-amp? If its a loose tube you will get a crackle and possible loss of signal. OTOH a microphonic tube can 'sing' (whistle, whatever you want to call it) and often responds or stops when tapped or subjected to vibration. Such tubes won't sound their best... | |
World's best Pre-amp for $10K and above? Audiozen, I can only assume that you did not read the article at the link I posted earlier so here it is again:http://www.atma-sphere.com/Resources/Paradigms_in_Amplifier_Design.phpThe top mega-buck solid state amplifiers all havein common very hi... | |
Amp Shutting Down, need help Is the AC cord plugged in on the same side of the line as the preamp and front end of the system? | |
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... |