Ultrasonic Oscillation

Yes, i did switch to a set of DH Labs special edition ICs from pre to amp. Thin wires. Have a set of MAC palladium ICs from CDP to Pre but had been using them a while. Dave

Hi, thought I'd follow up on this thread. I took suggestions to have my equipment bench tested, both sets of speakers as well as pre and power amp checked out OK. Set everything up, and now five months later HF still dead. Again and again yet I swapped all equip and wires. Problem still exists. I have been told it's not likely but can it be in my house wiring? I have also ran power to other outlet elsewhere in the house via heavy duty extension cord and same problem. Any suggestions, what can I possibly be missing? Yeah, I'm totally frustrated and at a loss. Thanks much, Dave

Hi Atmasphere, thank you for your response. I appreciate it very much. And a consideration that I had not considered. I have used my GMA Europas(4 ohm/88db/7-120W @ 8 ohm amp)for years with both an Odyssey Stratos amp at 150W @ 8 ohm and a Denon POA 1500 at 150W @ 4 ohm. I don't play my sytem at loud volumes. The GMA's are known as an easy load and are known to be driven with low power amps from what I have read here over the years. That really is what is vexing, until this year system played fine. Even the Snell's that are a more difficult load are pushed by tube systems of a lesser power then the amps above from what I have read also. This weekend I'll be taking the system to my daughter's house to see if the problem persists there no matter how dumb that may sound. No stone unturned. Again, thanks much. Dave

Thank you both for your comments and explanation. If I understand you right, this is something that occurs internal to the device rather than user or environmental. When this occurs, say within an amp, does the damaging effects move in direction of the speaker outputs or also in the direction of the preamp/source? Or conversely, if the pre is in oscillation and damages the speakers do I assume that the amp is damaged also. Two pair of damaged speakers and a couple of pieces of suspect equipment, I am a bit frustrated but I feel much better being provided explanations of a possible problem. I appreciate your thoughts very much. Again, thanks. Dave

Do you think that the addition of a sub (REL Strata III) correctly connected to the amps speaker posts could create this instability in the amp? Again, thanks.

Atmasphere, clipping. I associate this with volume, loudness. I have old ears, on a clock with six o'clock being zero volume I drive the volume no more than 1/4 (9:00). Can this low level create a clipping situation? Please know, to all, I've learned alot through this thread, you all have provided a wealth of knowledge. Thanks much, Dave

Hello all, I was going through some threads discussing palladium and came across an old thread of mine. So Timru here's the rest of the story and no it wasn't the kitchen lights although I only wish. As part of my desperation and frustration I dragged all of my equipment to Music Technology and Bill Thalman's gave it all a clean bill of health. I called him back to discuss and he came to my house to listen and said the high freqs were performing as they should. So now what to do, listen to my wife who said the problem had to be me. Many times. I had my hearing checked and now with hearing aids music is beautiful. I now consider the ear horns as one more critical piece of equipment in my system. Am I hearing what others may hear, most likely not but in my limited ranges a great joy.
And that's the rest of the story. Regards, Dave