Chosing an on-off switch

WhiteSE

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I want to install an on/off switch for my Grunding tube amp...How many amperes should it be...it's a smallish ell80 amp....
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A toggle switch like that in your picture will likely be rated for somewhere around 4 - 6 amps at 120VAC. That would be plenty.
 
I believe Frank uses 12 amp switches when it comes to power amplifers,because of the high inrush current levels. Many amplifier on/off switches have failed because of incorrect, or insufficient sizing. Remember that switches are the "sacrifical" lamb. Every time it makes or brakes a load, there is arcing on the contact points.
 
I used an LED rocker switch like this red one on my RCA console tube amp. I wanted it to light up so I could tell when it was on.

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