Yes, the
=1118826']sticky knobs is something that many Rumblers, though by no means all, have encountered and most have fixed it with various aftermarket knob sets.
And, likewise,
=1118826']a hum has been encountered by some others, with less obvious remedies. Some thought it was
=1118826']fan noise. Some returned the unit to the vendor for replacement, while others learned to overlook it when not too loud.
I do not recall many complaining of
both these annoyances, but maybe some did. Ideally, these are things that a second-hand seller would discount the price for. Good luck! Keep us updated.
.
Thanks. At home the hum in particular is loud enough to hear in the next room. I could live with the "fan noise" as it will be drowned out on gigs, and I do no do any recording.
The hell of this is I took pains to get a sit-down with the amp before I forked over the cash. I simply didn't notice any idle noises at the venue. My hearing is not very good at my age, but I was in a hurry and didn't bother putting my good ear down next to the speaker! That's on me, but I will push hard to get most of the money back from the seller, even if he's holding the money. If he'd take the amp back and keep $100 of my cash I'd be thrilled. I don't relish trying to pawn this amp off on anyone, assuming I can't come up with some fix or workaround for the hum.
Re: that hum, and previous comments in this thread about possible causes: I have an identical R-200 v3 and can sit them side-by-side, using the
same AC outlet,
same power cord,
same audio cord,
same basses, and my #1 amp is quiet, while the new #2 has the hum. So it's not dirty power, a ground issue, or interference from nearby appliances or light fixtures. It's the damned amp, and I'm just sick about it.
Update:
I just set out to play with the tone (EQ) knobs, and was surprised to find (without touching anything) that the hum is now barely audible. I should be happy, but I know damn well it'll be back.
However, the "fan noise" is not the fan at all, it's audio "hash" out the speaker, nearly identical in its random crashy, crackly, sputtering sounds to "atmospherics" on shortwave radio. I've been a ham radio guy for 40 years, and it sounds like the static crashes and ionospheric noise any ham would recognize in an instant.
And yet ... if I turn both the Gain and Master volume down to 0, I still hear the static noise coming out of the speaker!
If I plug in some headphones, the speaker goes silent, but oddly I do not get the static noise in the headphones.
So the static noise is somehow being injected between the audio final and the speaker (but not the headphones). Possibly a bad speaker wire connection?
I'm really at sixes and sevens now.
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