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 tube overdrive pedals+plate voltage
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FRANZONI
Double Platinum Member

Ireland
3543 Posts

Posted - 09/25/2007 :  13:34:13  Show Profile  Visit FRANZONI's Homepage  Reply with Quote
hi all.... as some of you may know i changed my boss overdrives for a seymour duncan twin tube classic a while ago....and it was something dr bob posted about in another thread that got me to thinking..some of the gigs i do are small and the audience if there up dancing have on occasion stumled on top of us and spilt beer on top of the pedalboard over the years without any real disaster occuring (boss didn't get their rep for toughness for nothing)but because of the nature of the twin tube and the plate voltages it uses (fairly high from what i understand)what would be the outcome if this happened...?? i imagine the twin tube would blow up in some fashion because it gets really hot like a valve amp..but could i get a shock off the guitar in any way at all or could it damage any of the other pedals with a voltage spike..... i still carry the od2 in the gig bag just in case i survive and the gig is rockin'.........

bossarea if this should be under non boss gear discussions please feel free to move it...........

Dr. Bob
Moderator

Australia
6593 Posts

Posted - 09/25/2007 :  16:25:27  Show Profile  Visit Dr. Bob's Homepage  Reply with Quote
Hi Franzoni & Guys

PM the type of vales that it uses.
Are there any specs in that back of the manual.

Yes, from what I remember, the plate voltages on your "Seymour Duncan twin Tube Classic", are high.
I would guess at around 130VDC to 180VDC, at the actual plate, but like with almost all small signal valves, the current is small, usually about 1mA to 2mA per Triode section.
and most are Twin Triodes.

Speculating what would-might happen from a spill, will really depend on where & how the spill is, & how valves are mounted/protected.

Open it up and have a good look at how it's made & where the cooling vents are situated.
Maybe even post or send me some internal pics.

Keeping the OD-2 in the gig bag in case, is always a good idea, even just as a backup.

I carry a SansAmp GT2 & a Behringer GI-100 direct inject box with 4x12 emulation, in my gig case, as my emergency backup, & studio direct recoding amp emulator.
And a couple of new 9V batteries.

Hope that help somehow.
if not, post or send the internal pics

Regards Dr. Bob
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FRANZONI
Double Platinum Member

Ireland
3543 Posts

Posted - 09/27/2007 :  22:32:42  Show Profile  Visit FRANZONI's Homepage  Reply with Quote
hi doc...... the vents are on the side,the top is pretty well protected..it was more if it got in around the switches or control knobs....the valves are 6071 subminiature mil spec ones developed years ago for the U.S army and supposed to be very robust and last a lot longer than ..i.e a 12ax7.....but this unit gets very hot as does the transformer......i think i just was a little nervous as i know someone who had a pint of guinness spilt inside his marshall years ago and the results were according to him spectacular.....as was the repair bill....nothing like the sound of exploding el34's......i'm probably just getting unduly worried over nothing....if i see one going cheap in the secondhand ads i might buy it for a reserve as this pedal has become very quickly an integral part of my sound......
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