IGS Audio DTL – Double Triode Limiter

Where the great sound begins?

The Double Triode Limiter (DTL) is more than classic tube triode microphone preamp. The old-fashioned design was upgraded with a musical opto-limiter. The limiter is based on circuit used in 60’s and 70’s.

The Preamp.

The DTL is a tube microphone preamp adapted to work with any type of microphone. A wide range of amplification makes it possible to record drums as well as the quietest ribbon microphone. DTL does a great job of recording tracks from external devices such as synthesizers or drums machines (like Akai MPC). Great results are achieved with reamping tracks from DAWs. The DTL adds a nice tube saturation to the sound. The high impendance inputs (HiZ) allow for connecting an electric or bass guitar directly into the grid of the first step of tube amplification (Typical HiZ solution).

The Limiter

Additional device capabilities are activated by the Limiter section. This can be used to limit peak levels of the input signal. The component in charge of compression is an IGS Audio custom designed photocell. When the limiter is working it is indicated by a LED labeled “Limit” on the front panel. The limiter controls the louder parts of the signal and prevents from the digital clipping at the inputs of you ADC. Another trick could be using the DTL as a drum compressor or mix buss compressor. It can improve the overall dynamics of the mix and give it a brighter sound. This is a very versatile device for audio processing.

The Limiter

Additional device capabilities are activated by the Limiter section. This can be used to limit peak levels of the input signal. The component in charge of compression is an IGS Audio custom designed photocell. When the limiter is working it is indicated by a LED labeled “Limit” on the front panel. The limiter controls the louder parts of the signal and prevents from the digital clipping at the inputs of you ADC. Another trick could be using the DTL as a drum compressor or mix buss compressor. It can improve the overall dynamics of the mix and give it a brighter sound. This is a very versatile device for audio processing.

DEVICE TYPE
Optical Compressor	Yes

INPUT & OUTPUT
Input Pad	Yes, -20 dB
Input Impedance (balanced)	300 ohm (1M ohm for Hi-Z instrument input)
Phantom Power	Yes
Output Impedance (balanced)	600 ohm
Audio transformers	Yes

LEVELS
Operating Level	+4 dBu
Max output level	+22 dBu
Max. gain	60 dB
Max Gain Reduction	18 dB

BANDWIDTH
Frequency response	20Hz to 20kHz; +/- 0.3dB

DISTORTION (@ 20 HZ – 20 KHZ)
THD+N	<0.1%

FRONT PANEL
VU Meters	Yes, output level

POWER
Voltage	115/230V AC, 50 – 60Hz
Power consumption	40W
Power supply	internal

PACKING BOX
Dimensions	70x50x30 cm
Shipping weight	7kg

OTHERS
Tube set	6N1P, 6N2P

Download user manual here.