[LAU] sortof OT -- ART tube pac preamp and compressor noisy?

Brett McCoy idragosani at gmail.com
Mon Aug 12 15:29:37 UTC 2013

On Mon, Aug 12, 2013 at 11:05 AM, Rusty Perez <rustys.lists at gmail.com>wrote:

> Hi folks,
> This is related to recording, and my recordings are made on linux, so,
> it is tangential to all of these lists. :-)
> I own an ART tube pac, which is a preamp compressor combo unit.
> It is the first generation of this unit I believe. I've just started
> using this unit.
> Anyway, I'm hearing a low level hum, sortof like a grounding hum.
> Does anyone else use the ART line of pres? Has anyone had trouble with
> them?

I've got a rackmount 2 channel ART tube pre, and a pair of small ART tube
DI/pre-amp units. Never given me a bit of trouble like this.

> The unit uses 2 tubes and I'm sure they aren't high quality tubes.
> Could a lower quality tube cause a low level ground hum?
> The unit has a grounded plug, and I can't seem to get rid of the hum
> by unplugging other components, but when I mute the unit through my
> sound card, the hum is decreased.  The hum is audible in silences on
> my tracks, so I know it's not just my playback system.
> Now, before you go on about how the ART pre is cheap and crappy. I
> know it's a budget pre, that's why I can afford it. I'm only looking
> for constructive ideas, or similar experience.

Likely not the tubes, could be bad wiring in the unit, flaky power supply,
etc. What is the unit plugged into? Power conditioner? Power strip?
Directly into the wall? Did you try different places to plugin to rule out
any issues there?
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