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350-watt Bass Amplifier with Tube Preamp

Found on stages around the world, the Hartke 3500 bass amp is back in classic black. Yet it retains the same rock-solid performance and features that made the original one of the most popular bass amps of all time. The 3500's unique circuitry ensures that every nuance of your bass playing is faithfully reproduced. With 350 watts of power at 4 ohms, tube and solid-state preamps, bass and treble contour controls, and a 10-band graphic EQ, the HA3500 will make sure your sound sounds its best, no matter what kind of music you play.

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  • Sculpt Your Tone

    Featuring two Pre-Amp input knobs, allowing custom blending of tube and solid state tone, and ten-band graphic EQ, the 3500 is ideal for the player who wants plenty of power and control. But we don't stop there. A dedicated preset button allows you to set a equalization curve and two fully adjustable contour knobs provide even more shaping of your distinctive sound. A built-in compressor adds real "punch" to your bass sound, and also allows you to smooth out volume differences between notes.Rugged construction and professional features make the 3500 totally road-worthy. Two independent inputs accommodate both passive and active bass guitars. LEDs that show you the settings of the graphic equalizer in low-light environments as well as a two-color LED that continuously shows the status of the compression circuitry in response to your playing.Electronically balanced direct output provides routing signal to professional mixing consoles for both live performance and recording environments. A ground lift switch helps prevent hum or buzz from entering the signal, and a pre/post switch allows the direct signal to be derived either before or after the amp EQ section.With all the features you need for complete tonal control, along with ample power and rugged design, the 3500 will ensure complete bass euphoria no matter what kind of music you play.

Features / Specs


  • Power: 350 watts at 4 ohms, 250 watts at 8 ohms
  • Selectable tube and solid-state preamps
  • Active and passive inputs
  • Rotary bass and treble contour controls
  • 10-band graphic EQ
  • Balanced XLR direct output
  • Rack Ears included


Input Sensitivity Passive Input  100 k Ohms, 20 mV 
Active Input  100 k Ohms, 60 mV 
Rated Power 350 watts @ 4 ohms,, 240 watts @ 8 ohms 
Total Harmonic Distortion  less than .5%
Signal To Noise Ratio  approx. 78 dB 
Contour Low Pass  ±18 dB @ 100 Hz
Contour High Pass ±18 dB @ 10 kHz
 Ten-Band Graphic Equalizer ±15 dB, center detented @ 30 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 3 kHz, 5 kHz, 8 kHz 
Compression Ratio  2:1 to infinity 
Send Output Level 0 dBM 
Return Input Level  0 dBM 

Warning CALIFORNIA PROPOSITION 65 WARNING: Cancer and Reproductive Harm -

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