The TUBE-TECH HLT 2A is a stereo equilizer featuring active low and high shelving EQ, a passive T-filter plus passive Hi/Lo cut filters and an overall bypass switch.
The shelving EQ's are designed around a high gain tube amplifier, and the T- filter and Hi/Lo filters are passive filters placed after the active shelving EQ and before the output amplifier. All sections are supplied with a bypass switch.
The HLT2A furthermore features an overall bypass switch.
The midrange T-Filter "tilts" the entire spectrum around a selectable midrange frequency point. Frequencies above that point increase (or decrease) while frequencies below that point decrease (or increase). This unique topology, provides a powerful and uniquely efficient way to get beautiful-sounding overall equalization. As such, the Tube-Tech HLT-2A is destined to become a "go-to" equalizer in high-end mastering houses,smaller project studios, and everything in between.
Like all Tube-Tech processors, the stereo HLT-2A possesses a warmth and character that breathes life into a track and gives it an organic body that somehow manages to occupy real physical space inside a stereo mix,
However, the functionality of the HLT-2A is unique in the Tube-Tech line - and indeed in the world of analog processing. Users will find that the HLT-2A generates quick, intuitive results that can range from mild to extreme, and it sounds great on individual tracks or strapped across the drum bus or the mix bus."
TUBE-TECH HLT 2A is a stereo unit, featuring low and high cut filters,low and high shelving filters and a T-filter.The shelving filters are designed around a high gain tube amplifier.The T-filter is a passive filter placed between the shelving filters and the output amplifier. All three sections are supplied with a in/out switch.The low and high cut filters are also passive with a slope of 6dB/octave.A bypass switches the whole filter section out of the amplifier circuit, keeping the output stage in the circuit.The T-filter is like a seesaw. When the low end goes up, the high end goes down and visa versa.When the potentiometer is turned clockwise, the high frequencies are boosted and the low frequencies are attenuated.When the potentiometer is turned counter clockwise, the low frequencies are boosted and the high frequencies are attenuatedThe unit is all tube based except for the power supply.Input and output have fully floating transformers.All DC voltages are stabilized, except the anode voltage for the output stage.
GENERALTube based push-pull amplifierFreq. resp. @ -3 dB: 5 Hz - 55 kHzLow noise: