Check the listing for details. Switchcraft Transistorized Mixer Model 307TR- Vintage New In Box. Condition: New. Listed at 100.00 USD. Introducing the Switchcraft Transistorized Mixer Model 307TR- Vintage New In Box, a 4-channel mic mixer that is perfect for any music enthusiast. Made by Switchcraft, a renowned brand in the industry, this mixer is a top-of-the-line product that is sure to impress. With its transistorized design, you can rest assured that this mixer is of the highest quality and will provide you with a seamless mixing experience. This mixer is perfect for those who are looking for a reliable and versatile product that is easy to use. With its compact design and sturdy build, it is ideal for both home and professional use. Whether you are a musician, podcaster, or voiceover artist, the Switchcraft Transistorized Mixer Model 307TR- Vintage New In Box is the perfect choice for you.