Silver Supporting Member
What level of noise if normal on a Two Rock Traditional Clean? Mine is quiet for the most part but there is definitely a bit of hum / hiss introduced as the Gain or Reverb Return knobs go about half way.
The nature of how these amps are laid out will inherently introduce *some* power transformer noise (generally more of a "buzz" than a "hum") into the circuit through the reverb signal path. The reverb tank has transducers that pick up EM noise due to the relative proximity to between the two components. The higher you turn up the reverb return, the more present this noise will be. It is a topic that's come up here in the past.I've noticed this with mine as well. It doesn't always seem consistent either. I honestly probably wouldn't notice, but my Bloomfield is dead quiet. I've seen this mentioned a couple of times, so I assume it's just normal. It definitely seems related to the reverb.
As for how "quiet" the amp is or how "noticeable" the noise is. That's a subjective/relative thing. In a live setting, this PT reverb noise level will almost always be well below the relative noise floor of the venue (i.e. the audience isn't going to hear it over the sounds of everything else going on in the venue). Studio recording of the amp at moderate/loud volume will also put the PT reverb noise below the noise floor of the recording once tracking levels are adjusted (i.e. you won't hear it in the final mix because it will be too quiet).
Where the noise comes into play, and where it was noticeable to me, is when you're playing at low/moderate volumes in a quiet home or studio. Here, the relative volume of the guitar may only be 10 times as loud as the buzz instead of 100X, or 1000X as loud in the two scenarios above. From talking with the guys at TR, the design of these amps is geared towards optimum performance in the the two former scenarios rather than the latter, which is understandable.
There are options to try and minimize this noise. Some are more feasible than others.
The only way to get these amps 100% dead silent (with respect to PT reverb noise) is to get the reverb tank out of the EM field of the power transformer (the EM field extends several feet in all directions from the PT, making this option challenging), or reorient the reverb tank in a way that doesn't allow the EM field of the PT to transmit through the transducers of the reverb tank (EM fields ARE directional after all).. Or skip using the TR reverb all together in favor of an alternate reverb type/source. Not an option as far as I'm concerned. Half of the reason I own the amp in the first place is because of the TR reverb.
Me personally. I'm anal retentive about noise and I did some experimenting and fabricated an alternate mounting method for the reverb tank in my TC head that eliminates nearly all the PT reverb noise in my amp. Now I'd have to max out the reverb return and crank the master to even hear any of it in a quiet room.