@tattooedtrackman It sounds like a small high pitched cymbal hit due to the vibrational shock of the relay transmitting via the PCB I suppose. It only happens when coming off of volume 0 when the relay kicks in.
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$5K for upgrade. They now have a dedicated person dining upgrades, so the turn around is fast. Well, it was two weeks a couple months ago.
The 6 and 6SE is exactly the same preamp with upgrades in a number of components.
I’ve been using Audio Research preamps for thirty years while swapping other components and never encountered any kind of incompatibility or noise.
This thread highlights the diversity of sensitivities we have to various noises and operational issues. Some manufacturers really need to add an alternate "high sensitivity speaker" reference rig to expose noise issues. Not ARC though - they’re doing just fine; their tube gear is already as quiet as can be wished for, in the ways that count.
Reports are consistent that 6 => 6SE upgrades are currently VERY fast. Anyone who’s thinking about it should take advantage of that now. The out-of-warranty repair queue is more concerning...6 months? Don’t send your 6 or 6SE in for the 6H30 ping-tshhhh "issue". Btw it’s really a long decay on that "tshhhhh" part - that’s the 6H30 for you. New set of tubes at most. I guess it’s possible if your PCB board is coming loose somehow, that could exacerbate the 6H30 / relay noise. Everything needs to be tight inside.
I don’t expect the 6SE upgrade would impact the 6H30 microphonics or the output impedance. It’s purely for quality of sound.
@mulveling I Just now checked out your system. Very nice 👍. I too had the Ref 5SE. Bought that used. Sold it for the brand new Ref 6 last year from my ARC dealer. And had it upgraded to the Ref 6SE. Got it back in June. And yes. It took about 2 weeks. Did u have your 6 upgraded or u bought it new ?
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