The JOYO JF-18R Power Tune is a combined power supply and tuner built to sit on a pedalboard. JOYO describes it as "a compact and convenient way to combine the essential tools of the guitarists pedalboard", saving space by putting both jobs in one enclosure1. The power side delivers eight isolated DC 9V outputs, center negative, and the tuner side uses a large LED screen with a true bypass circuit1.
Power: eight isolated 9V outputs
The power section is the heart of the JF-18R. It provides eight isolated DC 9V outputs, all center negative, split into two groups1:
- Six standard outputs at 100mA each. JOYO says these give "the standard 100ma power for most of your standard analogue pedals on your board"1.
- Two high-current outputs at 500mA each. JOYO describes these as covering "even the most demanding digital effects units"1.
All outputs are isolated, and the POWER section features "a filtered low noise output with short circuit and over current protection"1. Isolated outputs keep each pedal's power feed separate, which is the usual approach for cutting the ground loops and whine that shared power supplies can introduce into a board. The short-circuit and over-current protection means a fault on one output is contained rather than dragging down everything connected to the unit1.
The unit itself runs from one DC 9V input with a 2A input current, center negative, and the adaptor input accepts AC100-240V, so it works on mains power in the US and abroad with the appropriate adaptor1. JOYO lists the running current as DC120mA1.
The tuner
The TUNE section delivers its readout "via the large LED screen, which is easy to see in any lighting condition" according to JOYO1. The tuning input is a 1/4 inch mono port, and the listed tuning range runs from 12Hz to 4186Hz, which reaches from below a bass guitar's lowest note to above a standard-tuned guitar's highest fret1.
JOYO states that "the tuner section features True Bypass circuit to minimise signal loss"1. With true bypass, the pedal's circuit drops out of the signal path entirely when the tuner is not engaged, so it does not load down or color the signal on its way through the board.
Where it fits on a board
A combined tuner and power supply suits players building a compact board who want to free up the space and cabling a separate power brick would take. JOYO frames the product exactly that way, as combining "both power supply and tuner into one amazing product, saving space"1. RockBoard's PedalPedia entry lists the circuit type as digital2.
Players comparing options in this space can look at other combined units such as the Caline Tuner Power and Rowin Power Tuner, or at dedicated tuners like the Boss TU3 Tuner, TC Electronic PolyTune 3 Mini and Peterson StroboStomp HD. JOYO's own tuner range also includes the Joyo Irontune and JOYO JF-326 Irontune. For the wider picture, see the Tuner Pedals type page.
JOYO's product page lists a JF-18 Manual PDF dated 17 December 2019 for this unit1.
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Questions
How many outputs does the JOYO JF-18R have?
The JF-18R has eight isolated DC 9V outputs. Six of them deliver 100mA each, which JOYO describes as standard power for most analogue pedals on a board. The remaining two deliver 500mA each, aimed at demanding digital effects units. All eight are center negative, and the unit takes one DC 9V input with a 2A input current.
Is the JOYO JF-18R center negative?
Yes. JOYO specifies the eight outputs as 8 isolated DC 9V outputs, center negative, and the unit's own power input is also DC 9V center negative with a 2A input current. That matches the polarity used by the overwhelming majority of guitar pedals, so standard center negative cables work throughout.
Can the JF-18R power digital pedals?
JOYO says so. Two of the eight outputs deliver 500mA each, and the maker describes them as covering even the most demanding digital effects units. Digital pedals generally draw more current than analogue ones, so the two high-current outputs are the ones to use for them, while the six 100mA outputs suit standard analogue pedals.
Is the tuner in the JF-18R true bypass?
Yes. JOYO states that the tuner section features a True Bypass circuit to minimise signal loss. The tuning input is a 1/4 inch mono port, and the tuner display is a large LED screen that the maker says is easy to see in any lighting condition.
What is the tuning range of the JF-18R?
JOYO lists the tuning range as 12Hz to 4186Hz. That spans well below the lowest note of a four-string bass in standard tuning and up beyond the highest frets of a standard-tuned guitar, so it covers both guitar and bass use.
Does the JF-18R have short-circuit protection?
Yes. JOYO describes the POWER section as having a filtered low noise output with short circuit and over current protection, and lists isolated short-circuit and over current protection among the unit's features. If a cable or pedal faults, the protection is designed to isolate the problem rather than take down the whole board.
Sources (2)
- JF-18R POWER TUNE_JOYO, JOYO Audio, 2019-12-17
- JF-18R Power Tune by JOYO, RockBoard (PedalPedia), 2026
