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In Reply to: RE: A pair of these would do posted by Brian Walsh on July 23, 2014 at 18:01:42
nt
By denying scientific principles, one may maintain any paradox.
Galileo Galilei
Follow Ups:
What would happen in the event just one of the tubes goes bad? ......
Atma-Sphere amps don't blink an eye when an output tube goes. They just put out slightly less power. You turn off the amplifier, replace the bad tube, check DC offset once the tube is conditioned, and go back to listening.
A couple of things you can do with the amps:
- Pull out an output tube while music is playing. Nothing happens, you just get a slight reduction in volume.
- Short out the speaker binding posts by putting a quarter across them. This is equivalent to when the speaker cable spades inadvertently touch each other either at the amp or at the speaker. Most amplifiers will fail in one way or another, some blowing a resistor or something, others in a catastrophic way. This stresses the amplifier, but in the case of the Atma-Sphere you just don't hear any music out of the speaker. Remove the quarter and the music resumes immediately as if nothing happened.
I wish all amplifiers were as fault tolerant.
Brian
So much music, so little time!
If a tube goes out, and the effect is negligible.......
1. How would you know a tube went out?
2. How would you know which tube(s) went out?
1. You might see a flash when the tube goes, or worst case you'd notice one side (one triode) of a tube isn't lit up any more.
2. See above.
Brian
So much music, so little time!
.
You can't do anything with the output tubes -- they're either 6AS7G or 6H13 types sourced from Russia or China, and NOS ones have been found to be unreliable. In the case of the 6SN7GT driver tubes, yes, you can try different ones if you like. The MA-3s each have 12 of them, but not all of them would be worthwhile rolling. Still, anyone who can afford the amps might be inclined to experiment. Tell you what, when my ship comes in and I get a pair you can come over and we'll try a bunch.
Brian
So much music, so little time!
nt
By denying scientific principles, one may maintain any paradox.
Galileo Galilei
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