The R 500's preamp uses one ECC83 tube, manufactured by JJ Electronics.

Markbass amps/combos are manufactured to be sold and used in the country of purchase, and they are factory preset to that country’s voltage.
Due to homologation issues, the voltage may not be changed.

Rack ear kit included.

INPUTS

INPUT
impedance 500 Kohm, max. voltage 9 Vpp
EFFECT RETURN
impedance 33 Kohm, max. voltage 12 Vpp

CONTROLS

GAIN
-80 dB to +25 dB range
MASTER VOLUME
GROUND LIFT
switch on rear panel

EQUALIZATION

LOW
center frequency: 80 Hz; level: ±12 dB
LOW MID
center frequency: 400 Hz, level: ±12 dB
HIGH MID
center frequency: 800 Hz, level: ±12 dB
HIGH
3 kHz shelf, level: ±12 dB

OUTPUT

LINE OUT
balanced XLR, max. voltage 25 Vpp
EFFECT SEND
unbalanced, max. voltage 12 Vpp (pre-EQ)
TUNER OUT
unbalanced, max. voltage 2 Vpp
SPEAKER OUT
speakon / 1/4" (x2)

OTHER

WEIGHT
8.16 lbs / 3,7 kg
DEPTH
11.89 in. / 30.2 cm
HEIGHT
3.39 in. / 8.6 cm (2 rack units)
WIDTH
14.5" / 36.8 cm (with rack ears: 19" / 48.3 cm)
OPTIONAL FOOTSWITCH
mute
OUTPUT POWER
500W RMS @ 4 ohms, 300W RMS @ 8 ohms
POWER REQUIREMENT
100V; 120V; 230V; 240V
50/60Hz
(Voltage is factory preset according to region of sale)

Rock means different things to different bass players, so with the R 500, you can rock out old-school, rock hard, make your own alternative, or shred up the stage and steal the spotlight from your guitarists! This analog 500W amp (at 4 ohms; 300W @ 8 ohms) features a tube preamp that will break up just like you want it to, and a newly designed limiter that produces glorious distortion instead of cramping your style. The simple four-band EQ gives you all you need to accesses a wide range of different rock sounds. Gain controls the amount of tube overdrive, master controls your volume.