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Harley Benton PowerPlant Tuner


Tuner Pedal with Built-In power Supply for Additional Pedals

  • Chromatic floor tuner with built-in multi-power supply
  • Suitable for guitars and basses
  • Dimensions including switch and sockets (W x H x D): 70 x 55 x 122 mm
  • Weight (without power supply): 300 g
  • Includes stabilized DC power supply (AC 100-240 V), 8 DC cables and 2 cables for reversing the polarity


  • Large LC display
  • True Bypass
  • Tuning range: 12 - 4186 Hz
  • Accuracy: ± 1 cent

Power supply:

  • 6 Outputs: 9 V / 100 mA
  • 2 Outputs: 9 V / 500 mA
  • Total output: 1600 mA
  • Isolated sections
  • Polarity: Center negative
  • Short circuit and over-voltage protection
Available since December 2015
Item number 372334
Sales Unit 1 piece(s)
DC/AC current DC
Output current in mA 1600 mA
9 V Yes
12 V No
18 V No
Secondary voltage No
Multi-output power supply Yes
Chromatic 1
Display LCD, LED
PSU Connector 1
Design Floor Tuner
Special Features 6x 9V/100mA & 2x 9V/500mA Power Outs
Dimensions 70 x 55 x 122
Weight 300 g
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Including VAT; Excluding £10 shipping
In stock
In stock

This product is in stock and can be shipped immediately.

Standard Delivery Times
Delivery approx. between Tuesday, 23.07. and Wednesday, 24.07.

294 Customer ratings

4.2 / 5

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215 Reviews

Works as a power supply, not really as a tuner
Zef 17.02.2022
For someone who needs both a power supply and a tuner this seems like a pretty good deal. However as soon as I put it in my signal chain I got amazing 1950's flying saucer effects all over my sound, especially when turning up the gain.

The bad:
Tried it at different parts of the chain, with different amplifiers and at a studio with the same result. The only way to keep it plugged in without sounding like an Ed Wood flick was to plug it in my amplifier's headphone jack, so that it's actually outside the signal chain. I still need to switch to a clean sound for tuning to work properly. The tuning accuracy isn't great either.

The good:
On the upside it works fine as a power supply in my experience: two 9V/500mA for my digital pedals and 6x 9V/100mA for the rest covers your basic needs. Doesn't seem to add noise to the pedals' sound. The kit has what you need for most cases: 2A 9V DC power supply for the pedal itself, cables of different lengths and two cables for inverting polarity for those center-positive outliers.

In conclusion:
I would not recommend as a tuner as I needed to find a workaround for the noise it generates through the audio output, but works fine as a power supply (at least for my pedals).


Does what it's supposed to, but comes with VERY noisy adaptor
VeryShortNickName 20.08.2021
The pedal works great. It's very easy to see the display, so far I connected 3 other pedals on the 100mA (a Wah, a mini TS, and a Mooer Black Secret) and it does not generate hum or added noise.
Next pedal will be a Whammy DT and I will update the review after testing it.

Major downside, and the reason I cannot give it 5 stars is that it came with a VERY noisy adaptor. The power source injected a siren like noise which made playing unbearable.
Thomann sent me a replacement, but unfortunately the replacement had the same issue. It got solved it after buying a "Truetone 1 spot" at a local shop. No more hum, but cost me 20€ more.


Solid construction, mixed performance
ISBM 10.10.2017
I have this tuner pedal in my stage rig which covers my role as a bass player in one band and guitar in another. I did have issues with it at first but have now found a set up that works.

There is noise; by the bus load. This occurs when certain distortion pedals are in the signal chain. Not a problem I have had with any other pedals so I assume that this one is to blame - So why do I still use it? Well I like the look of the display and the fact that it distributes power saving space. My bass rig (in Drop D) has always been fine and I note the comments in other reviews about not registering correctly - never had it myself. Even when using a 5 string bass with a low B it registers.

For guitar I have had to compromise but again, once I found what worked the pedal consistently performed.

So what should you make of it?
If you are willing to persist with it then you have a very well made tuner with a great display. If you want to unbox, plug in and use then perhaps you should find something else. I will be keeping mine and will continue to play about with pedals until I work out what is causing all that noise!


Great tuner with bonus perks
loi7d 30.03.2023
The tuner works perfectly, the led is well lit. The option to power other pedias is a bonus for the price. You can't hear much noise from the power supply.
I recommend it!