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GMS294A 4 Pole Low Pass

Transistor Ladder Filter for Eurorack

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 EU version is housed in a 12 HP (2.4 inch wide by 5.04 inch high) panel with Eurorack compatible power connector.



Resources

Technical Specifications


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
+12 Volts 35 mA.
-12 Volts 25 mA.

Module Size
Panel height - 5.03 inches (128 mm)
Panel width - 2.4 inches (61 mm)
Depth (behind panel) 2.1 inches (53 mm)

Kit - $165.00

Assembled - 234.00

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