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Aesthetix Io won't start...

I have had no problems with my phono preamp until yesterday, and like it a lot. Yesterday it stopped working. With the Io, the normal operation is that when you turn it on (on the power supply), there is a Heater light that goes on immediately, and then a High voltage light next to it, that goes on after a few minutes. Now, however, the High voltage light stays off, and there is no sound. I have tried waiting for an hour, changing the power cable, checking the fuses, and even changing all the tubes both in the power supply and in the main unit. But it did not help. Any ideas?
o_holter

Showing 2 responses by rushton

rushton's avatar
rushton
2,445 posts
 
One thought: some of the Io units have fuses mounted on the circuit board inside the case. Later production units eliminated these, but my unit has them. If you're comfortable opening the case, do so and take a look for a typical BUSS style fuse (glass with metal end caps) mounted on the circuit board and check that fuse. Jim now manufactures the Io with this fuse bypassed and inoperable because it tripped to easily and proved not to add any real value in protecting the circuit. I had this fuse trip on me once several years ago and Jim had to tell me about it's existence. I replaced it and have not had another problem.
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rushton's avatar
rushton
2,445 posts
 
Great to hear, O_holter!! BTW, Jim says not to worry about anything being wrong if these fuses blow. Just replace them and move on, they are unlikely go out again and it's not an indication of a problem with the unit. This is why he's eliminated them from current production.
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