Retrospec Squeezebox - Bad Tubes? Microphonic?
I have a Retrospec Squeezebox compressor and have noticed some odd behavior from it lately. I'm assuming it's the tubes but have no prior experience so here I am...
When I bump or tap the enclosure you can hear it through the amp/cab. It's relatively loud too, kind of like tapping a microphone. So much so that I can actually use it to emphasize the 2 and the 4 as I play. In reading up on microphonic tubes there is no mention of behavior like this but it's all in the context of amps, not compressors or effects pedals. Seems like it's a bad tube but nothing out there confirms it in my research.
The other thing that happens occasionally is that when I engage the switch it will be very noisy. I disengage and then engage again just a moment later it's perfectly quiet (well relatively). I have not moved the comp, nor have any of the conditions in the room changed (no new lights on, no TV or monitor on, nothing). I know it's a little sensitive to electrical noise but it's getting worse as the weeks go on, and it seems to be a little erratic compared to previous experience. Plus, in troubleshooting I can't contribute the excess noise to anything in the room/setup.
So, anyone have similar experience with tubes in their pedals or in general that can definitively attribute the odd behavior to a bad tube or both tubes? It's easy enough to get some new tubes and try it out but I figured someone might know for sure and perhaps this could be useful for someone else out there as I have found pretty little on the subject.
Odds are it's either a bad tube or a bad electrical connection (loose solder joint or loose mechanical contact). Either one could cause a loud thump/pop when you tap the casing.
I would open it up, plug into your rig and power it on, and test inside by tapping on the tubes and various other parts and places in there. To avoid getting shocked, keep one of your hands in your back pocket (seriously!) so as to not absent-mindedly have both hands on the metal ever; and use a non-conductive probe thingy (like a plastic chopstick) to do the tapping.
Sorry to hear your squeezebox is having some issues.... please let us know if you figure out what's the problem is/was...
It's actually not much of an issue. I had a 4hr gig this weekend and it was flawless throughout. The bumping is just an issue of not clumsily knocking into it and the noise is a rare occurrence but I thought it was worth mentioning. I am going to open it up tonight and poke around (safely). I'll report back as I think this thread might be helpful for others out there. The compression still works great so it's probably just a tube starting to go. Stand by...
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