As I said, it is a bad way to find out how things work. Your questions suggest that your understanding is much weaker than you think it is.MagicBus said:
and the good news is that all these can be learned......
i learned about tubes from reading the posts ot tube gurus here...
and you can too...
i learned about tubes from reading the posts ot tube gurus here...
and you can too...
> if instead of voltage regulation you had current regulation
Since the dawn, amplifiers run on batteries. (Or battery eliminators....)
Power systems generally (aside from series arc-lights and a related trick in airport lighting) run "constant voltage". You have "120V" from the wall. It may be 124V or 113V depending how you suck it, but pretty-near 120V (or 230V if that is the local flavor).
Current-supply amplifiers are sure possible. Studio microphone Phantom power is one. But the usual technique is to feed the current to a voltage regulator and run the amp constant-voltage.
The general reason we work with stable voltage and varying current is that batteries make so-much Volts per cell, and a simple generator or alternator turned constant-RPM makes so-much voltage.
Connecting the field of a generator can make it run constant current. The "problem" is that if the load is disconnected (or too-light), the output voltage goes to infinity (or very-high). A constant-voltage source run no-load won't hurt itself. A constant-current source no-load is liable to voltage breakdown.
But there IS a I dual for every V solution. While audio interfacing is usually low-Z to hi-Z (constant voltage), there is also "matching" and even " current source". For a while some European hi-fi (at least recorders) had 100K resistors out of every output, and every input was 1K into a microphone preamp. We also have early transistor stages, when voltage-gain was easy but current-gain very expensive. 10K collector impedance would drive 1K base impedance. This also leads to "backward pots", because the pot is not a Potentiometer now, but a current-splitter.
But stick to the main road before you wander off into side-paths which are historically seen as dead-ends.
> Your questions suggest that your understanding is much weaker than you think it is.
Agree. This can be cured. But don't tire-out our arms beating "common sense" (which nobody is born with) into you.
Since the dawn, amplifiers run on batteries. (Or battery eliminators....)
Power systems generally (aside from series arc-lights and a related trick in airport lighting) run "constant voltage". You have "120V" from the wall. It may be 124V or 113V depending how you suck it, but pretty-near 120V (or 230V if that is the local flavor).
Current-supply amplifiers are sure possible. Studio microphone Phantom power is one. But the usual technique is to feed the current to a voltage regulator and run the amp constant-voltage.
The general reason we work with stable voltage and varying current is that batteries make so-much Volts per cell, and a simple generator or alternator turned constant-RPM makes so-much voltage.
Connecting the field of a generator can make it run constant current. The "problem" is that if the load is disconnected (or too-light), the output voltage goes to infinity (or very-high). A constant-voltage source run no-load won't hurt itself. A constant-current source no-load is liable to voltage breakdown.
But there IS a I dual for every V solution. While audio interfacing is usually low-Z to hi-Z (constant voltage), there is also "matching" and even " current source". For a while some European hi-fi (at least recorders) had 100K resistors out of every output, and every input was 1K into a microphone preamp. We also have early transistor stages, when voltage-gain was easy but current-gain very expensive. 10K collector impedance would drive 1K base impedance. This also leads to "backward pots", because the pot is not a Potentiometer now, but a current-splitter.
But stick to the main road before you wander off into side-paths which are historically seen as dead-ends.
> Your questions suggest that your understanding is much weaker than you think it is.
Agree. This can be cured. But don't tire-out our arms beating "common sense" (which nobody is born with) into you.
Current and voltage. I mixed up CCS loading theory fragments. The reason for subscribing to these forums is to cure my building ability and theory backround mismatch. If I wasn't the OP, I would just been following all these excellent posts! OTOH I don't regret exposing myself to this discussion! I just hope the way I took advantage of your willing to share knowledge wasn't rude. I' m obliged to you all!
it is always good to know theory and be able to apply them to actual builds...
the hows and the why's of tubes gets me all excited.....
the hows and the why's of tubes gets me all excited.....
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