I got this from Bassdirect.  The reason I bought her was as a lightweight back up to my Markbass TA501 which was my main gigging amp back then and I was fed up carting my Eden WT400 in a flightcase around as the back up.  Within a few weeks of getting the F500 I got a TC Electronic RH450 amp which became my main gigging amp with a 450 classic for additional power (doubling as back up).  So, having used the F500 at one rehearsal only it has remained in my music room unused and the amp is in immaculate condition with no marks (sic) or scratches whatsoever.  I have the original box etc. I even got the Markbass carry case which is also unused.  Well. I'm looking to get a few things but in no hurry so I thought I'd put the amp up on here to see if there is any interest.  I'm looking for 500 pounds (firm) for the amp and will do the amp and carry case for 545 pounds (firm). No trades or offers.  Prefer pick up from Richmond, Surrey although will post at buyers cost. 
 
Some pictures: 
 
  
 
 
 
 
 
Technical blurb from the Markbass site: 
 
INPUTS 
INPUT 
impedance 500 Kohm, max. voltage 15 Vpp 
EFFECT RETURN  
impedance 22 Kohm, max. voltage 25 Vpp  
CONTROLS  
GAIN 
-80 dB to +25 dB range 
MUTE 
push/pull master volume pot 
LINE OUT LEVEL 
level control on front panel  
PRE/POST EQ (for line out) 
switch on rear panel 
MASTER VOLUME 
GROUND LIFT 
switch on rear panel  
EQUALIZATION  
LOW 
center frequency: 40 Hz; level: ±16 dB 
LOW MID (semi-parametric) 
frequency 100-800 Hz, level ±16 dB 
HIGH MID (semi-parametric) 
frequency 700 Hz-6 kHz, level ±16 dB 
HIGH 
center frequency: 10 kHz: ±16 dB 
VPF (Variable Pre-shape Filter) 
center frequency 380 Hz (cut) 
VLE (Vintage Loudspeaker Emulator) 
frequency range 250 Hz-20 kHz (cut) 
OUTPUT 
LINE OUT  
balanced XLR, max. voltage 10 Vpp 
EFFECT SEND 
unbalanced, max. voltage 20 Vpp (pre-EQ) 
TUNER OUT 
unbalanced, max. voltage 25 Vpp 
SPEAKER OUT 
speakon / 1/4" (x2) 
OTHER 
WEIGHT 
4.63 lbs / 2.1 kg 
DEPTH 
10.04 in. / 25.5 cm 
WIDTH 
10.87 in. / 27.6 cm  
HEIGHT 
1.73 in. / 4.4 cm (1U) 
OUTPUT POWER 
300W RMS @ 8 ohm, 500W RMS @ 4 ohm 
POWER REQUIREMENT 
100V; 120V; 230V; 240V 
50/60Hz 
(Voltage is factory preset according to region of sale)  
 
  
 
 
 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.