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In Reply to: RE: Maximum Output posted by tube wrangler on January 28, 2015 at 18:46:29
Dennis, I'm having trouble understanding what you are saying.
1. You said "...the advertised plate resistance is 800 ohms. I said ADVERTISED-- and yes, it will measure-out-- it's not wrong."
First you say the plate resistance is "advertised" as being 800 ohms.
Now this statement to me means that the plate resistance is something other than 800 ohms. But then you say it's not wrong?
So do you mean that the plate resistance is really 800 ohms?
If that is what you meant, why did you first say "advertised"?
So which is it? 800 ohms or something different?
2. You said "The JJ-2A3-40 will dissipate up to 40 watts, not crap-out at 15." but at 43ma and 250 volts that's only 10.75 watts of plate dissipation.
Why does it matter that the tube will do 40 watts if you are only going to use 10.75 watts?
As the tube operates along the load line, to the left of idle, the current goes up as the voltage goes down.
As the tube operates along the load line to the right of idle, the current goes down as the voltage goes up.
The plate dissipation stays (more or less) the same.
3. You said "Into 2.5K? That's coasting on a Banana Peel for it. This thing could drive 1K! No, I'm not going to design for 1K, but I'll bet that this tube could drive it."
Didn't you already say the plate resistance IS 800 ohms?
If the plate resistance is 800 ohms then a 1k ohm load impedance would cause a very vertical load line and the harmonic distortion would be very high because the operation to the right of the idle point, following the load line, will drop almost immediately into the non-linear region of the plate curves.
The fact that the tube will dissipate 40 watts does not change that. Only a lower plate resistance would change that or a MUCH higher idle current. The angle of the load line is directly related to the plate resistance not the tube's plate dissipation capability.
In all three of the above examples I really don't understand what you are trying to say.
Dennis, I've been to Montana and I know first hand that people from Montana speak English but when I read your posts I don't get the sense that you are speaking English. I don't know what language you are using and I don't understand what you are saying.
Do you?
In all honesty,
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Hey! I get it, TRE!
NEVER challenge a published Dogma. Oh, but I do!
Bring ANY amp that you think is THE best, and I'll run it against this design-- the one that you prefer not to understand-- on our system at RMAF 2015.
This offer is open to anyone who brings a SET that is built right, and looks like it.... something the Demo room can justify showing to the public.
IF all of the people present choose yours, we will run it-- and name it's builder-- to the public.
If that happens, my design will go on the Display table, yours will get to play.
I will not vote unless there's a Tie.
---Dennis---
If there's a tie it means yours is just another 2A3 amp and doesn't require your vote. For that matter, if only 60% of the listeners prefer yours, it's just another 2A3 amp.
!
The Mind has No Firewall~ U.S. Army War College.
The answer is in my last post and is obvious-- a set of dogma proves nothing-- performance and longevity proves everything.
I've had enough of this crap. Good Day.
---Dennis---
this request either."Dennis, do me a favor?
With your amplifier playing music at your normal listening level connect a scope at the B+ end of the output transformer. Adjust the scope for the most sensitivity. Be sure to tell us what that setting on your scope is (volts per division). Do you see any waveform on the scope? If you do, what's the amplitude of the waveform peak to peak?"
Or any of the many other straight up questions I and others have asked you, over the years, where you never gave a straight up answer.
Thanks anyway Dennis. Have a nice day.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 01/30/15
This message has been moved to a more appropriate venue .
Edits: 01/30/15
What does any of that have anything to do with the questions I ask you?
Does the JJ 2a3-40 have a 800 ohms plate resistance or not?
What does the fact that the JJ 2a3-40 will dissipate 40 watts have to do with it's performance in an amplifier where the idle plate dissipation is only 10.75 watts?
If the JJ 2a3-40 has a plate resistance of 800 ohms how can it operate, with low distortion, into a 1k ohm load with the idle current at 43ma?
These are not technically hard questions.
Why can't you just give me a straight answer?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Hey! I get it!
Bring ANY amp that you think is THE best, and I'll run it against this design-- the one that you prefer not to understand-- on our system at RMAF 2015.
This offer is open to anyone who brings a SET that is built right, and looks like it.... something the Demo room can justify showing to the public.
IF all of the people present choose yours, we will run it-- and name it's builder-- to the public.
If that happens, my design will go on the Display table, yours will get to play.
I will not vote unless there's a Tie.
---Dennis---
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