Check the listing for details. Peavey PL-1 CS series Amplifier Jumper Plug (1 Plug). Condition: Used. Listed at 15.00 USD. Up for Sale is a Peavey PL-1 Jumper Plug for use with the CS series of amplfiers (mainly the original CS-400 and CS-800). These plugs allow the 3 pin jack on the amplifier to operate, without them only the 1/4" inputs on the amplifier are active. on the later series of CS they have a button on the back that does what this jumper plug does. This plug is NOT a transformer but simply a way to use the 3 pin connector with the naturally unbalanced input of these amplifiers. The listing is for a single plug but as shown in the pictures i have many so get multiples if needed. Check out my other auctions if you need other peavey plug in modules. These are sold on first come first serve basis, all the ones with labels will sell first then the unlabeled ones.