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TUBE-TECH HLT 2A/M
Stereo High- and Low shelving, T- filter
& Low- and High cut
Description:
The 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 attenuated
The 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.
(180813)
Lydkraft ApS
1
Mose Allé 20, DK 2610 Rødovre
Denmark
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Summary of Contents for LYDKRAFT TUBE-TECH HLT 2A
- Page 1 & Low- and High cut Description: The 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.
- Page 2 The amount of boost is +4 db and the attenuation is -7 dB Centre Freq. kHz: There is three centre frequencies of the filter: 0,5- 1- 2 kHz. (150505) LYDKRAFT ApS Mose Allé 20, DK 2610 Rødovre Denmark...
- Page 3 In the HLT 2AM the gain potentiometers are replaced with 23 position switches. LOW SHELVING and HIGH SHELVING: The gain control is in 23 steps: +/- 0,5-1,0-1,5-2,0-2,5-3,0-3,5-4,0-5,0-6,0-7,0dB T-FILTER: The gain control is in 23 steps (180813) LYDKRAFT ApS Mose Allé 20, DK 2610 Rødovre Denmark...
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Page 4: Adjustment Procedure
0,0 dBU. 5) Set the “BYPASS” switch in “OUT” 6) Adjust the preset GAIN P2 (CH1) and P102 (CH2) (located on amp/psu PCB) to an output reading of 0,0 dBU. (150928) LYDKRAFT ApS Mose Allé 20, DK 2610 Rødovre Denmark... - Page 5 H: 2 units, W: 19", D: 165 mm Weight: 4,3kg (Net) 5,5kg (Shipping) Power requirements: 115V/230V, 50-60Hz, 30-45W All specifications at RL=600 Lydkraft reserves the right to alter specifications without prior notice (1800813 jgp) LYDKRAFT ApS Mose Allé 20, DK 2610 Rødovre Denmark...
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