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The EM 1A from Tube Tech is a modular passive tube equalizer based on the original Pultec design, for use in the company's RM8 tabletop enclosure. 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 thus eliminating noise from the amplifier.
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 transformer balanced (600Ω) and fully floating. The in/out key switches the filter in and out without clicks, while the amplifier remains in the signal path. A red LED shows when output clipping is approached. The input and output transformers come with a static screen between the primary and secondary wirings.
Passive EQ module for use with the RM8 tabletop enclosure
All tube-based push-pull amplifier
4-position bass frequencies with +14dB boost
4-position bass frequencies with -18dB attenuation
10 high-frequency selections with with variable bandwidth and variable boost
Amount of boost varies according to bandwidth selection
3 high-frequency selections with up to -18dB attenuation
No insertion loss
Click-less in/out switch
In the Box
TUBE-TECH EM1A - Passive EQ Module
One (1) Year Warranty
Table of Contents
Number of Channels
1 x XLR (on power supply) Also available via a global 25-pin D-Sub input connector
1 x XLR (on power supply) Also available via a global 25-pin D-Sub output connector
Maximum Input Level
Low Band: 20, 30, 60 and 100Hz Mid-High Band: 1, 1.5, 2, 3, 4, 5, 8, 10, 12 and 16kHz High Band: 5, 10, and 20Hz
Mid-high frequency variable, dependent on boost setting