via this auction"The TM-7 is no longer made, and those interested probably know exactly what it is!
As the manual states:
The TM-7 is abasically a mean, angry preamp made of three vacuum tubes. Plus a feedback loop which makes the preamp unstable. The first tube is a 6AK5. It was used as an IF amplifier in military radios and suchlike. We use it as a preamp-a BAD preamp. The SCROTUM knob controls input volume. (No, you can't turn it fully down. This is intentional-because it interacts with the DOUBLE SCROTUM switch. Turning downw the input won't silence the awful noise and oscillation. Ha ha ha.) The the signal goes through ANOTHER 6AK5. The MEGA SCROTUM knob affects its gain. So, MEGA SCROTUM is basically a drive control. MEGA SCROTUM may be turned fully down, if you wish (it may or MAY NOT fully silence the TM-7). Finally, we have a 6BN6 tube. It was used as an FM modulation detector in cheap FM radios. You're not supposed to use it for audio. But it has a neat effect-when overdriven, it sounds like a push-pull guitar amp driven deep into saturation. You can affect the saturation with the SCROTUM UP YOU ASS knob. The DOUBLE SCROTUM switch inserts a FEEDBACK loop in the circuit. It's just an awful, awful thing. You'll find out. The SMASH switch selects the output desired-down, and you get the output of the second tube. Up gives the output of the third (6BN6) tube. If you want maximum saturation, flip it UP."
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