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In Reply to: RE: Thank you! posted by maxhifi on December 22, 2016 at 12:45:55
Run the JJ-2A3-40 at 11.2 watts dissipation. Ideally, this is with 255-260VDC across the tube.
Direct couple will drastically outperform cap-couple, and transformer-couple is second best. Use Lundahl.
LCLC is the only way to go with your PS. The "L's" don't have to meet critical inductance, but they DO have to be connected directly to the rectifier D.C. output.
A.C. Ripple should be looked at, but sonically, is a less-important factor in S.E. operation. The object is to get ripple as low as is practical without adversely affecting musical expression and flow.
Power for the driver tube must be as clean as possible, but once again, you don't want to compromise musical performance in order to "overkill" it-- be responsible to musical flow-- ignore numbers except where you truly need them to accomplish a certain thing.. Then, understand WHY you are doing or allowing a certain set of numbers.
The JJ-2A3-40 is capable of near-perfect performance if it is used right.
The EMLs are the same plant's more expensive variety. If an amp is set-up for either kind, it WILL NOT sound optimum on the other tube style.
I find it easy to get the SAME performance from either type-- the methods used are DIFFERENT from each other.
Decide what you're going to run, and then make the amp perfect with THAT tube ONLY. You can still run others-- if you set the amp up right, the others won't sound as good as the set-up tube, no matter what else you use.
The bottom line is that your amp can only sound as good as the man who set it up...
--Dennis---
Follow Ups:
LCLC implies a critical inductance first choke.
Isn't lClC (little l) a better representation of what you are doing?
Kind of like when one adds a small cap to a critical inductance choke filter to increase the voltage a little bit?
Those are referred to as cLCLC with the small c denoting that the first cap will not make the filter act totally like a cap input filter.
Just like your first choke is too small to make the filter act like a real choke input filter. (each diode staying on for it's full half cycle)
Hey, it's just a suggestion to keep it real and not confuse anybody.
I wouldn't call a cLCLC filter a cap input filter and you shouldn't call what you are doing a choke input filter.
Yours acts much more like a cap input filter than it does a choke input filter.
There's no reason not to be honest about it.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
In another post you said,"First of all, most NOS 45's, 2A3, 300B, etc., have a rectangular
plate structure, and usually a rectangular grid structure.So far, so good. Now, what happens when we insert a non-symmetrical
part into this desirable arrangement-- we place into it a filament structure that is made like a cheap toaster-- a folded-up filament
mess that is "M" or "W" shaped."My question is,
What is the shape of the electron cloud?
Just because the filament is "a non-symmetrical part" doesn't mean the cloud is "non-symmetrical" and keep in mind the electrons do not go from the filament to the plate. They go from the electron cloud to the plate.
If the electron cloud fills the space between the filament and the grid in an even way then the fact that the filament is "a non-symmetrical
part" won't/shouldn't matter.edit, by "fills the space" I mean the entire dimensional area.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 12/25/16
Hello Dennis,
Please sir, what do you mean with this phrase ..
" they DO have to be connected directly to the rectifier D.C. output. "
Thanks.
Jeff
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