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In Reply to: RE: Choke or CCS loaded ECC83 in phono stage? posted by Story on February 05, 2025 at 03:00:43
The higher the load impedance on a triode the more horizontal the load line will be. With a CCS in the plate circuit, the plate load impedance becomes the value of the grid resistor in the next stage and that would make a load line that is very close to horizontal.As horizontal load line on a triode gives the most gain and the least harmonic distortion.
In the example above we see that the voltage swing with a 8 volt peak to peak input signal is larger with better symmetry comparing the plate voltage change from the red idle point to the green (horizontal high impedance load line) vs. blue (lower plate load impedance load line).
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 02/05/25 02/05/25Follow Ups:
I was tempted to think it would do just that, give me more vgain. But it's not a tube!
It wasn't enough, although it should have been. Graphs are not applicable in this case. My K&K CCS, although dated V09/02 years old, came with instructions and I followed them without mistake. At least 4 times or more. It was still not enough gain and put them away, still have them, worth a try but didn't particularly care for the sound.
Looking at the circuit he's reading, maybe he should try it anyway and see if it's suitable for his purposes although I doubt it.
Maybe you should explain it to HIM, NOT ME with some helpful advice.
Good luck you 'all
"I was tempted to think it would do just that, give me more vgain. But it's not a tube!"What is not a tube?
CCS aside, the gain of a triode tube stage goes up as the plate resistor is increased. That is a direct result of the load line becoming more horizontal. That is just a fact and if you are not getting that result then you are doing something wrong.
BTW the theoretical max gain of a stage is the mu of the tube in use. That can never be reached but with a CCS plate load and a high 'following stage' grid resistor value you can get really close.
P.S. I may have mis-read your post. If you got more gain but not enough more gain then I would use a different tube, one with a higher mu.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 02/05/25 02/05/25
you must have read my reply wrong, or I was just wrong answering this guys question and should not have as you mistakenly done so. My Brain damage from a fall works sporadically now, but getting better. I used to be far, far more succinct at one time.
I stand by my statements however, the query in the beginning of thread asks for CCS or Choke, and I say it will not be enough. Maybe a tube stage will do. Besides he never asked how much gain he needs.
If you've tried to get me off this forum, you've done a good job. I'll give you a 'B' grade. I will never GIVE UP. Doctors advice.
I have never tried to get you off of this forum.
I don't understand why you would have that impression?
Audio electronics is all just science. Opinions (especially mine) should never be taken personally. I only state what I believe to be the science. None was meant as a personal attack.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
it said it was a 'B' grade, and I will keep trying under MY circumstances.
Now please ask the OP what he wants, what he's looking for. Thank you Tre'
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