atmasphere
Responses from atmasphere
| Manual vs. Auto Bias Yes, the whole thing is confusing!'Fixed bias' refers to any method of biasing the amp where the changes to the bias are affected by adjusting the voltage on the grid. This voltage 'fixes' the bias.'Self bias' (also sometimes called cathode bias) ... | |
| damping factor Here's a link you may find useful, that relates directly to the matter of damping factor and matching the amp and the speaker for optimal operation:http://www.atma-sphere.com/papers/paradigm_paper2.htmlThere is no speaker made that requires more t... | |
| Manual vs. Auto Bias Viridian, the term 'auto-bias' refers to a form of fixed bias operation, wherein the bias current is monitored in some form by either an analog or digital servo circuit which allows the amp to react to changes which may come from the tubes or perh... | |
| Which speaker has the biggest sound stage? Its pretty well known that the older Maggies had problems with the glue that held the voice coil to the diaphram. Apparently it was sensitive to UV; if left in a room that had direct light it would break down over the years. If your room had no su... | |
| What the heck is bias anyway? Mitch4t, automatic bias as a feature varies from amp to amp. With some systems it is quite simple and others rather complex. The accuracy varies too. For the most part what autobias means is that the most 'fiddling around' will have to do with ini... | |
| Reel to Reel decks Astralography, thanks for your spot-on observations. | |
| What the heck is bias anyway? Mitch4t, this depends on the amp. Some amplifiers have very stable bias settings and can be checked maybe once every 6 months. Others seem to need constant observation. So I would go with the manufacturer's recommendations. | |
| Tenor 75 Wi OTL Glory, Since you have ZU speakers you will not have much advantage in seeking an OTL with more power. | |
| What the heck is bias anyway? Lesse... the setting of the bias has *no effect* on the power output. It affects the distortion and the heat of the tube (or transistor).I think if the signal current(music) exceeds the bias current, then there is no sound or just tons of distorti... | |
| Anyone compared BAT Rex vs. Atmasphere MP-1? Talk2me, There is no power amp made that has an input impedance too low for the MP-1 (it can drive 32-ohm headphones directly from the same outputs that drive the power amps). The Burmester is completely balanced, so no worries. | |
| Setting tube bias Hifihvn, just for the record, yes, if a tube had a short then it could mess with the other tubes, depending on the circuit of the amp. Not in this case though- something is wrong with the amp. | |
| difference between an active and a passive preamp? Hi Al, The cable between the source component and the passive control plays a reduced role on account of the output impedance of the source. When the series resistance of the passive control is inserted into the circuit, the character flaws of the... | |
| What the heck is bias anyway? If you overbias the tube (set it so that there is too much current flowing) the tube will run hotter and distortion is sometimes higher. This would be particularly true of any class A amplifier.In a class AB amp, if the bias is set to high you can... | |
| Ocellia speakers and power If you want bass into the 20s or even the 30s, you will need a sub with either one. That 12" is nice, but even in a big cabinet it won't go all that low. It just goes lower that any full range 8" will do, but that means maybe 38-40Hz at best. | |
| difference between an active and a passive preamp? I can't envision a reason why the length of the cable between source and preamp would be any more critical than with an active preamp.With passive controls, the cable length is quite critical as is the construction of the cable. The interaction is... |