Metasonix Scrotum Smasher TM-7

Metasonix Scrotum Smasher TM-7

The Metasonix Scrotum Smasher TM-7 is basically a mean, angry guitar preamp made of three vacuum tubes. Plus a feedback loop which makes the preamp unstable. There is nothing else like it. No, it does not sound like a Death By Audio pedal. No, it won't make you sound like Steve Vai. It is unsuitable for 80s nostalgia cover bands, unless they like to do industrial versions of Duran Duran. Scrotum.

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 - badly. No, you can't turn it fully down. This is intentional because it interacts with the DOUBLE SCROTUM switch. Turning down SCROTUM won't silence the awful noise and oscillation. It just makes the TM-7 howl and scream at various pitches, intermodulating with your lovely sweet guitar tone. Ha ha ha. Scrotum.

Then the signal goes through ANOTHER 6AK5. The MEGA SCROTUM knob affects its gain. So, MEGA SCROTUM is basically a drive control. Scrotum.

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. Scrotum.

The DOUBLE SCROTUM switch inserts a FEEDBACK loop in the circuit. It's just an awful, awful thing. Stop playing with your balchinian.

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. (If you flip both DOUBLE SCROTUM and SMASH up, you'll get even worse distortion. It pukes upon the face of the universe. It destroys the godhead. It is MOCKING you. Scrotum.)

NOTE: The TM-7 outputs are divided down, so they are more compatible with solid-state devices than our previous TX series pedals. But it might still damage some cheap-ass audio devices.

Panel art is by the mighty Dave Lovelace (, creator of the Packrat and the Retarded Animal Babies.

Manufacturer’s Suggested Retail Price: $499.00

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User Reviews of the Metasonix Scrotum Smasher TM-7

  • Submitted by Ferox from Los Altos, CA (432 points) on Jun 22, 2008
  • When I first walked into robotspeak, I was almost sure that I was going to get the waveshaper. I thought "Well, maybe I should demo this smasher of scrotum pedal." Wow. I changed my mind real quickly.
  • Good Points: Three knobs, two switches, but tons of range. Feed something interesting into it while the feedback loop is on and you will get some really weird and harsh sounds. Without the feedback loop you can get some nice lo-fi unmusical muddy stuff. Rare tubes not meant for musical use. The artwork is pretty. Built with the strength of 100 boss pedals. Cool glowing green light.
  • Bad Points: NO BYPASS. Price. Size is a pain for bringing to shows. Yellow color is eeeh.
  • Price Paid: US$449.00
  • Purchased At:
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