Thank you for viewing. This is a Pro Co Turbo RAT (TR-100941), a 1998 model made in the USA. The unit is equipped with an LM308N op-amp, which provides the smooth, warm distortion characteristic of the classic RAT. 【Features】 Made in USA (Assembled in the USA) LM308N chip installed (Motorola) Potentiometer markings: ER3977 9831 (31st week of 1998) PCB markings: "Pro Co" "3896" Switch: Black square type On guitar, it delivers a detailed and thick distortion, and on bass, it adds thickness to the mid-low range, providing a sound with a strong presence. 【Condition】 Operation confirmed, no problems. The exterior has minor scratches and signs of use appropriate for its age (please check the photos for details). Box, instruction manual, and rubber feet are not included. AC cord is included as a bonus. This model of Turbo RAT from this era is considered to have a softer sound and more natural harmonics compared to later models (equipped with OP07). Easy to use both live and in the studio, it's truly the "authentic RAT sound." 【Shipping】 We will carefully pack and ship via Mercari delivery. Please feel free to ask if you have any questions.