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MARKBASS Studio Pre 500 DISCONTINUED The AMP 1 (8) signal passes through two ECC83S tubes for heavy tube distortion. The AMP 2 (10) signal passes through one ECC83S tube for a softer tube distortion. The AMP 3 (12) signal passes through a FET to create solid state distortion. Simply turn on the channel(s) you want by pulling the knob(s) out, and adjust the level(s) to taste. Turn any distortion channel off by pressing in its knob. 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. INPUT impedance: 500 Kohms, max. voltage: 10 Vpp CLEAN CHANNEL GAIN SECTION Tube: 1xECC83S, gain: 50 dB SEND/RETURN SECTION Return impedance: 50 Kohms Send output impedance: 1 Kohms Effect loop type: parallel PURE PARAMETRIC FILTER SECTION Frequency range: 60 Hz - 2 kHz Level: +/- 16dB Q: 0.5 - 8 EQ SECTION Center frequency: 40 Hz (low), 800 Hz (mid), 4 kHz (high), +/- 16 dB AMP CHANNEL AMP 1 Tube: 2x ECC83S AMP 2 Tube: 1x ECC83S AMP 3 Solid State COMPRESSOR On/off switch on front panel EQ SECTION Center frequency: 40 Hz (low), 4 kHz (high), +/- 16 dB FILTERS VPF (variable pre-shape filter, 380 Hz cut); High-pass filter (20 Hz -in. 1 kHz, -3 dB) OUTPUTS AMP LINE OUT Balanced XLR, max. voltage 10 Vpp CLEAN LINE OUT Balanced XLR, max. voltage 10 Vpp MIX LINE OUT Balanced XLR, max. voltage 10 Vpp Unalanced 1/4", max. voltage 2.5 Vpp TUNER OUT Unalanced 1/4", max. voltage 2.5 Vpp SPEAKER OUT Combo speakon / 1/4" FOOTSWITCH Amp channel (on/off) / Pure Parametric Filter (on/off) OTHER HEIGHT 3.39 in. / 8.6 cm (2U) DEPTH 11.9 in. / 30.2 cm WIDTH 14.5" / 36.8 cm (with rack ears: 19" / 48.3 cm) WEIGHT 8.6 lbs / 3.9 kg OUTPUT POWER 500W RMS @ 4 ohm, 300W RMS @ 8 ohm