User guide

LYDKRAFT ApS

Mose Allé 20, DK2610 Rødovre

Denmark

TUBE-TECH PE 1C

program equalizer

DESCRIPTION

The

TUBE-TECH program equalizer PE 1C

contains a passive filter and a tube (valve)

based amplifier to restore the loss from the filter.

The filter has a low frequency boost/attenuate section with 4 selective frequencies, a high

frequency boost section with a variable bandwidth and 10 selective frequencies and a high

frequency attenuation section with 3 selective frequencies.

The filter is placed directly after the input transformer therefore eliminating noise from the

amplifier when boosting either low- or high frequencies.

The amplifier consists of two tubes (valves) in push-pull configuration (one ECC 83 as the

pre-amp and phase splitter, and one ECC 82 as the output stage), and an output

transformer.

Both input and output are balanced and fully floating.

The in/out key switches the filter in and out without clicks and changes in level, while the

amplifier remain in the signal path.

The power supply for the pre-

amp and phase splitter are stabilized and the heaters of both

tubes (valves) are fed with a stabilized DC voltage.

The whole amplifier (including input and output transformer) and the power supplies are

placed on one PC-board.

(030507)

PAGE 1
TUBE-TECH PE 1C program equalizer DESCRIPTION The TUBE-TECH program equalizer PE 1C contains a passive filter and a tube (valve) based amplifier to restore the loss from the filter. The filter has a low frequency boost/attenuate section with 4 selective frequencies, a high frequency boost section with a variable bandwidth and 10 selective frequencies and a high frequency attenuation section with 3 selective frequencies.
PAGE 2
CONTROLS: LOW FREQUENCY SECTION: The low frequency section consists of a BOOST and ATTENuate control and a LOW FREQUENCY switch located just below. BOOST: The BOOST control is continuously variable from 0 dB to +14 dB. It is of the shelving type. ATTEN: The ATTENuate control is continuously variable from 0 dB to -18 dB. It is of the shelving type. LOW FREQUENCY: The LOW FREQUENCY switch determines at which frequency the maximum boosting and attenuation is obtained.
PAGE 3
BOOST: The BOOST control is continuously variable and is of the bell type. The gain is depending of the setting of the bandwidth control. When the bandwidth is in the sharp position the gain is from 0 dB to +18dB. When the bandwidth is in the broad position the gain is from 0 dB to +10dB. HIGH FREQUENCY: The HIGH FREQUENCY switch determines at which frequency the maximum boosting is obtained. There is a choice of 10 frequencies: 1, 1.5, 2, 3, 4, 5, 8, 10, 12 and 16kHz.