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In Reply to: RE: Buyig Tubes posted by pictureguy on August 11, 2021 at 12:28:14
"Tube amps apparently always present full PS voltage (500v or so?) TO the tube at all times....."
I'm not sure I understand what you mean by that. I'm not sure you understand what you mean by that.
Every amplifier has it's own design. Every amplifier uses the voltages it uses based on the designer.
I designed a single ended 300b amplifier and it uses 465 volts on the plate of the 300b. The 300b is cathode biased and draws 64ma of current at idle. There is 80 volts at the cathode so that means there is 385 volts across the tube (plate to cathode). These details will be different for a different design.
You say the above as if you think that transistor amplifiers don't always present voltage to the transistors. If that's what you think then you are wrong. Transistors run on lower voltages than tubes but the B+ voltage is always presents at the collectors in a SS amp, just as it is (to the plates) in a tube amp.
I hope that helps.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Yes....all tube amps will be different to a greater or lesser degree.
Point is that they ALL share high voltage TO the tube at all times....
I think that's one advantage ot a tube amp.
Too much is never enough
I am tripping over your use of the term "at all times".All amplifying devices (tubes or transistors) are supplied operating voltage, at levels appropriate to the device (and the circuit design), at all times while in operation.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 08/11/21 08/11/21
My bad......But I had already figured out the capacitor question.
the ENERGY part of it is highly voltage driven.....
But coming from a SS background, I must admit that seeing an amp with only a couple hundred MFD total is a little weird....
Too much is never enough
"But coming from a SS background, I must admit that seeing an amp with only a couple hundred MFD total is a little weird...."
I can understand that.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
And when you get into integrated circuits? Capacitors of a few volts and Nano values.
you cant' make much given maybe 5000angstroms wide (1/2 micron) and 1000A thick.....
Too much is never enough
Power supply filter capacitors need to be large in value. Signal capacitors don't necessarily need to be large in value.Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 08/13/21
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