Can floor vibration cause preamp tube squeal?

[IMENATOR]

Usually I play thru the crunch channel only but yesterday during rehearsal I switched to the lead channel for some serious heavy sound and there was this squeal coming in between the silent sections. We played louder than usual, my preamp has a real tube and is placed in the pedalboard which this time was in the "cross fire" of voice PA, Bass amp and Drummer, the floor has a wood layer that I notice was a bit loose. So could it be the room shaking plus a high gain channel be causing the squeal?

So far I have read some preamp tubes can be microphonic but is there anything you can do to remedy/compensate?

On next rehearsal I will definitely try placing my pedalboard on a different location that may not be so susceptible of floor vibration but I want to know your opinion, it is that time of the year you start planing what to do with the christmas bonus and a new preamp tube may be another way to try to tackle the problem.

 

[devastone]

Re: Can floor vibration cause preamp tube squeal?

Is this your AMT SS?

Sounds like it could be a bad tube, wouldn't hurt to try another, easy enough to do. As far as floor vibrations, I doubt that would have that much to do with it, I mean the vibrations a pedal sees are nothing compared to the tubes in a cranked combo.

 

[MetalManiac]

Re: Can floor vibration cause preamp tube squeal?

Sure it willl. try a dedicated low microphonic tube, put casters on your cabinet to decouple it from the floor, and put a rug underneath.

 

[devastone]

Re: Can floor vibration cause preamp tube squeal?

He's using a tube based pedal preamp so he's not getting vibration from the cab.

 

[IMENATOR]

Re: Can floor vibration cause preamp tube squeal?

Is this your AMT SS?

Sounds like it could be a bad tube, wouldn't hurt to try another, easy enough to do. As far as floor vibrations, I doubt that would have that much to do with it, I mean the vibrations a pedal sees are nothing compared to the tubes in a cranked combo.

Yep, it is my SS-20, it is the stock Russian equivalent to 12AX7. At this point I am thinking I may get on of those AMT solid state Warm Stone tube replacements for 12AX7, I was just hearing some tone shootouts and I just could not hear the difference.

 

[IMENATOR]

Re: Can floor vibration cause preamp tube squeal?

Is this your AMT SS?

Sounds like it could be a bad tube, wouldn't hurt to try another, easy enough to do. As far as floor vibrations, I doubt that would have that much to do with it, I mean the vibrations a pedal sees are nothing compared to the tubes in a cranked combo.

Well, the room was shaking a bit, we really played loud in an old house. And the wood layer on the floor was vibrating a lot were I placed the pedal board. But yeah, I will try a new tube.

 

[devastone]

Re: Can floor vibration cause preamp tube squeal?

I know the Russian tubes that shipped in the older versions of the SS-11 preamp (6H1XX or something) had a different heater voltage than 12AX7s (that's the first number in tube designations so it was 6V vs 12V). There was a dip switch or jumper on one of the circuit boards that needed to be changed to use a 12AX7. Not sure if the SS-20 is the same way, just something to be aware of if you put in a 12AX7 and it doesn't work.

And yeah, those warmstones look interesting.

 

[NecroPolo]

Re: Can floor vibration cause preamp tube squeal?

I had this only with high-gain amps sitting on loud cabs but never happened for tube pedals. I can absolutely imagine it can happen, though.

New tube time, maybe?