Functions: Channel, Reverb & Solo Switch
Where used: Rect-O-Verb 50 (Series II)
Cable used: Item# 678465 (Cable not included)
Note: Determining a Series I from a Series II Single Rectifier.
Series I amplifiers have a two-position mode switch for Channel 2 labeled "Vintage/Modern".
Series II amplifiers have a three-position mode switch labeled "Raw/Vintage/Modern".