Bass 400


SKU: Bass400D Category:


Demeter Sound in an Affordable Package

The famous Demeter sound and quality is now much more affordable, building on the concept of our VTBP-M-800D. We wanted to come up with even a smaller more competitively priced Amplifier that could deliver the Demeter sound, while keeping the compromises to a bare minimum. We are more than happy with the results. Real tube sound with lots of class D power in a small great looking Package. The Bass 400 & BSC-310 recently won the Premiere Gear award from Premiere Guitar! Check out the article here


Classic VTBP-201 tube pre-amp circuitry . Hand wired in the USA using High quality components, DC filament, full 220V high voltage supply. Passive tube tone controls Treble, Middle, Bass and Presence. Our new Mode switch that lets you control the overall tone: Dark, Normal and Bright. It also includes active and Passive inputs. The unit has a pre-amp output if you need to run more power amplifiers (like our Minnie 800D) and a power Amp input. The power Amplifier delivers 250 Watts RMS into 8 ohms and 400 watts RMS into 4 ohms There are two Speakon combo jacks on the back to hook up your speakers. The unit comes stock with a line level Balanced studio out that is selectable Pre or Post EQ. We also offer an upgrade for the studio out using a Jensen transformer microphone level Direct output. The Amplifier comes in a Black Tolex covered birch plywood cabinet with handle. The amp weighs only 8 lbs and measures 11”wide x 5.5”high x 8.5”deep. Built right here in the USA in our Barn in Templeton CA.


  • Inputs: two instrument level 1/4” jack. One for Active Basses and one for Passive Basses
  • Tone section: Treble Control: The treble control gives 6 dB of boost or cut at 4 kHz (6dB per octave, shelving type).
  • Middle Control: The middle give 6dB of boost or cut at 500Hz (wide Q, peaking type).Bass Control: The bass control gives 9dB of boost or cut at a frequency of 80Hz (6dB per octave, shelving type).Presence Control: The presence control gives up to 12dB of boost at a frequency of 4kHz (active type, 6dB per octave).
  • Mode switch: Dark, is a high frequency cut fattening up your fundamental. Normal, flat operation showing off more overtones. Bright, brings out the overtones on the dullest basses or speakers.
  • Internal Volume Trimmer: This control is designed to match the output volume of the VTBP-M-800D with the sensitivity of any Bass.
  • Standard, Studio output: Line level solid state driven 3 pin balanced output selectable Pre or post EQ with gound lift.
  • Optional, Studio Output: The VT-400-MJ features a mic level Jensen DB-E output transformer for a balanced studio output for the best isolation and ground lift.
  • Power Amplifier input: line level input for the 400 watt power amplifer +9 dB for full output
  • Pre-amplifier output: Lets your pre-amp control more power amplifers (Minnie 800D) for any size venue
  • Power Amp Outputs: Operating at 4 (400w), 8 (250w) or 16 ohm (150w). 1/4” & Speakon

Preamp Specifications

  • Input impedance: > 1meg ohm
  • Output impedance (line): > 1 kohm, (unbalanced)
  • Minimum load impedance: 10K
  • Maximum output: + 24dBV
  • Signal to noise ratio: – 80dB
  • Frequency response : 10Hz to 40kHz
  • Tubes: Hand Selected 1-12AX7a
  • Outputs (preamp): 1/4” unbalanced ,
  • Operating voltage: 115V or 230V AC
  • EQ gain : + or – 12 dB
  • THD : .5%
  • 3 pin XLR Direct out
  • Power supply: 220V DC
  • Filament: 6.3 V DC

Power Amp Specifications

  • Outputs (power amp): Speakon/1/4” Combo Speaker jacks
  • Output impedance (power amp): 4 ohm, 8 ohm, 16 ohm
  • Output Power (power amp): 400 watt RMS @ 4 ohms, 250 watt RMS @ 8 ohms

Additional information

Weight 8 lbs
Dimensions 11 × 5.5 × 8.5 in
Transformer Type

Stock Transformer, Jensen Transformer (+$250)


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