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For sale is very rare Raytheon RR10 vintage tube mic preamp. This is an amazing sounding microphone amplifier. Apparently were only made for one year period in the 1940s. Incredibly hard to come by. These are considered to be similar to the RCA OP-6 but with superior sound. This one works perfectly and is in excellent shape. Loads of gain, excellent choice for dynamic and ribbon mics. Recently serviced as needed. Don't pass this up!
