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Boost · T-Rex Effects

T-Rex Effects Karma

The Karma is a clean boost pedal from T-Rex Effects that delivers up to 16dB of gain using advanced circuitry derived from the company's buffer technology. It operates on standard 9V power and maintains a compact footprint.

  • 9V DC · center −
  • 10 mA
  • Analog
  • Mono
New
from $123.78
Used (asking)
from $55.29

The rundown

Highlights

  • Non-linear clean boost with up to 16dB gain
  • Advanced circuitry based on T-Rex buffer design
  • Compact size at 61 x 118.1 mm
  • Runs on 9V DC, 10 mA (battery-compatible)
  • Mono operation only

Best for

Musicians seeking a clean boost pedal in a compact format that runs on standard 9V power.

Quick facts

Power
9V DC
Current draw
10 mA
Polarity
Center negative
Dimensions
61 × 118.1 mm
Stereo
No
MIDI
No
Expression input
No
Status
In production

Where to buy T-Rex Effects Karma

$123.78 lowest new price · Reverb

Used listings asking $55.29–$91.56, median $69.50 (4 listings, small sample). Asking prices, not sold prices.

Current offers
SellerConditionPriceLink
ReverbUsed$55.29View
ReverbUsed$64View
ReverbUsed$75View
ReverbNew$123.78View
ReverbUsed$141.22View

Prices last checked 22 hours ago. Links to sellers are affiliate links.

Frequently asked questions

What power does the Karma require?

The Karma runs on a 9V DC supply with 10 mA current draw and supports center-negative power.

Does the Karma support MIDI or expression control?

No, the Karma does not feature MIDI compatibility or expression input.

Can the Karma be powered by battery?

Yes, the Karma is battery-compatible as it runs on standard 9V DC power.

Similar pedals

Same type, similar features.

Specs from pedalfilter. Summary written by PedalBro from those specs and public descriptions.

Page last updated September 29, 2026.