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I'm using an EAR 859 with Lipinski 505 monitors. I've switched the taps on the 859 to 4 ohms to accommodate the 4 ohm speakers. Although 4 ohm they are fairly efficient at a rated sensitivity of 92. The setup is in very small room. Sounds great when the recordings are lean in texture - small jazz ensemble or chamber group - and don't have any dramatic swings in dynamics. During loud peaks and when a full orchestra is employed, there is distortion. Hoping there is a simple solution. The previous owner said he just re-tubed the unit a few months ago. So if not a tube issue, what might be the cause?
Follow Ups:
you seem to be describing "clipping" which could be caused by not enough "power" or not enough "drive" etc...
not impossible to solve, but requires a lot of work.
Yes, sounds like clipping. But it's odd that it happens on low volume as well. Volume doesn't seem to be an issue. I realize my speakers are borderline in terms of efficiency.
if the amp does not distort with "simple" material, and clips with complex material... am thinking of intermod distortion, which could be caused by various factors : leaking caps which alters bias, drifting resistors, etc etc
whew !!! scope each stage to check where this is generated, but the problem is certainly not simple.
There should be somebody nearby who can check your amp.
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