Say a IIC+'s Reverb Ain't Working...

[JDGuitaristT]

Probably check the preamp tube, but then what? If it has to be sent in, how much would that cost, and how long would it take to get done?

 

[Boogiebabies]

Tube, cables, ground to chassis( Solder sleeves of reverb connectors for ground reference), reverb tank, footswitch and finally the jack in the amp is a shorting jack. Clean and adjust.

 

[Joey707]

One other thing that can go out is the reverb transformer. It isn't very likely but possible. I would check everything else first.