thinman Posted April 18, 2012 Share Posted April 18, 2012 I suspect the preamp valve in my H&K is going - after switch-on there's a period when the amp behaves like someone is turning the gain up and down - the volume increases and decreases smoothly before eventually stabilizing. Has anyone experienced this - could it be something like the valve heaters failing? I read about valves going microphonic or noisy but not this. I've ordered a replacement anyway. Quote Link to comment Share on other sites More sharing options...
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