EXT-T2 - Dual Tetrode Amplifier

Extracellular recording with 4-channel tetrodes becomes more and more popular. The EXT-T2 amplifier/filter is designed for recording from up to two tetrodes. The signals recorded from every single tetrode attached to the headstages are amplified and filtered, and linked to the BNC connectors at the front panel. Every OUTPUT is available at two BNC connectors. Measurements are done in single-ended configuration against GND, and filters and gain factors can be set internally.

NEW: Tetrode amplifiers are also available with miniature headstages for in vivo experiments in freely moving animals.


  • Two headstage for one tetrode each
  • Two BNC OUTPUTs for each channel
  • Headstage with x10 amplification for low-noise operation
  • Lowpass filter: 500, 2k, 7k Hz, set internally by DIL switches
  • Highpass filter: 0.24, 0.3, 1 Hz, set internally by DIL switches
  • Gain: x200, x500, x1000, set internally by DIL switches
  • Rear panel with connectors for input and output signal for each tetrode
  • 19” rackmount cabinet

Technical Data

Input resistance:
>1012 Ω, range ±1 V

Overall gain (x100, x200, x500, x1000), selectable by DIL switch
Output range: ±12 V into 1 kW / ±1 V into 50 W load

Low pass filter:
100, 500 2k, 10k Hz, selectable by DIL switch

High pass filter:
DC, 0.1, 1, 10 Hz, 100 Hz selectable by DIL switch

Power requirements:
12…18 V AC, 1 A min.; wall power supply

19” rackmount cabinet, 19” (483 mm), 10” (250 mm), 1.75” (44 mm)

Headstage Size:   
70 x 26 x 26 mm3

Headstage Amplification:

Holding Bar:
Length: 150 mm; diameter: 8 mm