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In Reply to: RE: "the 12AX7, properly implemented, will eat them ALL" posted by Triode_Kingdom on August 24, 2014 at 15:54:46
You are getting somewheres, go back and ask your ten year old to LOOK at the construction of a 6SL7 and a 12AX7, think about it, maybe the second try will be Golden for the kid.
HINT : What is simpler about the 9 Pin miniature ???? Less is more.
Jeff Medwin
Follow Ups:
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The Mind has No Firewall~ U.S. Army War College.
In my GE "Essential Characteristics" book it reads :5751 ( Special 12AX7 )
and has a mu of 70 instead of 100.
A 5751 will out-perform an octal 6SL7 as a input/driver tube in a really good L-W, but no one yet has offered a reason as to why this is so, my little challenge.
I'd much prefer to use a regular 12AX7, and avoid a 5751, because of the 12AX7's superb tube rolling possibilites and general availability.
Cheers...
Jeff Medwin
Edits: 08/24/14
Can you please define what you mean when you say one tube can "beat" or "outperform" another? That terminology has absolutely no meaning.
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Buy Chinese. Bury freedom.
It means diction and enunciation will be audibly better with one tube over the other, you can make out all the words clearly, versus a lack of TOTAL diction or enunciation. Nothing skewed, garbled, etc. We are all most familair with voice as a instrument of sound.
Its called listening I suppose.
Just have your ten year old look at both tube types, one in each hand, and you will see the difference easily. Your kid's first response was pretty good, but not definitive, correct.
Jeff Medwin
None of my amps are skewed or garbled. I've only ever heard that effect with miniature dual triodes.
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Buy Chinese. Bury freedom.
The 12AX7 is prized because it id very easy to turn into a distortion machine; high gain and pass almost no current. Great where you need massive amounts of gain, like in phono or in amping guitar pickups. They hate driving loads, however.
12ax7s have high plate resistance so a grounded cathode circuit built with a 12ax7 will have higher output impedance than a grounded cathode circuit built with a tube that has lower plate resistance (assuming both circuits are built to achieve the same percentage of "mu" of the tube in use).
12ax7s have a low max plate dissipation rating so a circuit built with a 12ax7 cannot deliver as much current to the load as a circuit built with a tube that has a higher max plate dissipation rating (assuming both circuits are built to idle at the same percentage of max dissipation at idle of the tube in use).
High output impedance and low current delivery means circuits built with 12ax7s can only drive high impedance, non reactive loads.
This does not describe the load represented by a DHT grid.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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