A transistor ladder made with vintage transistors gives the same sonic character to the GMS-294A Four Pole Low Pass filter recreation that the original 904A Four Pole Low Pass filter possesses.
A rotary switch selects the frequency range and a panel fine tune potentiometer allow setting the exact filter frequency. Gain controls are provided for the audio input and the frequency voltage control inputs.
The MU version is housed in a 1MU (2.125 inch wide by 8.75 inch high) panel with DOTCOM compatible power connector.
|Filter topology||4 pole low pass transistor ladder filter
24dB per octave overall
|Low Frequency Range||1Hz - 5KHz|
|Medium Frequency Range||4Hz - 20KHz|
|High Frequency Range||16Hz - 50KHz|
|Typical Input Impedance||100K Ohms|
|Typical Output Impedance||1K Ohms (short circuit protection)|
|Frequency control inputs||2 - Input 1 fixed 1V/Octave,
Input 2 with attenuator
|Module Power||+15 Volts 35 mA.
-15 Volts 25 mA.
|Module Size||Panel height - 8.75 inches (222 mm)
Panel width - 4.25 inches (108 mm)
Depth (behind panel) 2.1 inches (53 mm)
We produce electronic synthesizer modules in the two most popular formats, MU (Moog compatible 5U) and EU (Eurorack compatible 3U). A wide range of voltage controlled modules including oscillators, amplifiers, mixers, envelope generators, special effects units, wave generators, filters, power systems and cases allow users complete freedom to configure any desired electronic music instrument.
Grove Audio builds microphones, preamplifiers, equalizers, compressors and other professional audio equipment for performance and studio use. We build units in popular formats such as 19 inch rack mount and 500 series 3U modules. We can also produce custom designs on request. Contact us for a consultation.
You can explore all of our products, download spec sheets, and purchase our products in the Grove Audio Synth Store. You can also learn about our periodic specials and new product introductions. Click the button below to go directly to the store.