Pre 330 module

With our Pre 330 module we answer to those wanting a high quality Preamplifier with multiple inputs:

This Pre-330 module fits in a compact MODU Galaxy 330x40x170mm already. Of course a larger one would fit as well.

As said, it's modular, so several things can be added/changed by us or you:

  • In the basic version it is running as a so called "passive preamplifier", where just
       the volume is controlled by a logarithmic potentiometer. ALPS carbon fits.
  • Volume can be controlled by a Voltage Controlled Amplifier (VCA) module.
  • While using a VCA, gain can be set by a 0-5Vdc and/or an SPI signal
  • Buyer can choose for a basic or toroidal PCB transformer, both potted
  • Buyer can decide to have it with or without an MM/MC prepreamplifier part
  • MM/MC with single input setting OR 16 gain/16 impedance setting by rotaries
  • 6 Inputs, where IN 2 can act as MM/MC or line input, selection by jumpers
  • Input selection and output mute by silver plated relay contacts, 5V controlled
  • In/outputs can be hooked-up by any chassis RCA or basic PCB types
  • In/outputs can be buffered by adding buffer circuits per in/output
  • Those buffers can be in RCA or balanced XLR
  • Customer can make his own buffer circuit for about any signal
  • OUT 1/2 are for internal (integrated) and/or external use, OUT 1/2 go both outside
  • OUT 1/2 can be muted, meant for feeding amplifiers in f.e. other rooms or bi-amping
  • OUT 2 can be selected as Line out (volume controlled) or TAPE out (constant signal)
  • For increased sound quality a Voltage regulator module can be added
  • Frontpanel PCB's connected by a header connector are in development
               and could fit a LED/LCD level reading or an intelligent display module

While using this one, there is NO wiring at all.


Dimensions of all our modules are in a way, that you also can make Integrated amplifiers with them. Due to the width of this module you need to make a 2 stories cabinet where f.e. below is the power pamplier part (see Power amlieier section for examples) and above that this Pre-330 board. Actually we would recommend it the other way around: below the preamp, on top of that the power amp. So, for an integrated setup the cabinet needs to be at least 40mm higher than with just a power amplifier only.