EM1A. Passive, Tube amplified Equalizer

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Modular EQ EM1A - Description

The TUBE-TECH EM 1A Passive Tube EQ is an exact replica of our oldest "classic", the PE 1C all-tube, passive Program Equalizer, which itself is based on the classic PULTEC EQP 1A.

The EM 1A features an all-passive EQ section and a high quality op amp.

The circuit is in fact exactly the same as that of the PE 1C, only downsized to fit the modular form factor - without any changes whatsoever in specs or sound.

All the characteristics of the PE1C and all the famous special features are available.

All components, including all transformers are exact the same as in PE1C.

Due to the high quality of the TUBE-TECH RM Series power supply and the pristine audio circuits, the Modular Series products deliver exactly the same uncompromised sound quality as our 19” units.

For more detailed information about the EM1A sound, please go to the PE1C product page!

PM1A Technical Features

  • All-tube design featuring push-pull output amplifier
  • Frequency response @ -3 dB: 5 Hz to 60 kHz
  • Typical noise: 5 dB @ 200?
  • CMRR: > 60 dB @ 10 kHz
  • Gain: +10 dB to +70 dB in 2 dB steps - DI gain: 0-60 dB
  • Selectable mic input impedance: 600 ?/1.2 k?/2.4 k?
  • Selectable pad in front of input transformer (-20 dB)
  • Selectable +48 V phantom power
  • Low cut filter (20 Hz/40 Hz/Off)
  • Phase reverse
  • Overload indicator
  • Gold plated switches
  • DI Jack input for a variety of instruments
  • DI input impedance > 1 M?
  • MU-metal shielded input transformer
  • In- and output are transformer balanced and fully floating

PM1A Technical Description

The TUBE-TECH PM 1A is a combined Microphone Preamplifier and Direct Instrument amplifier.

The input provides a switchable +48 V phantom power, a select-able mic. impedance of 600/1200/2400 Ohm, a phase reverse switch, a low-cut filter (20 Hz/40 Hz/off), as well as a switchable -20 dB pad. Gain is adjustable from +10 dB to +70 dB.

The Direct Instrument Input are unbalanced with a gain ranging from + 10 dB to + 60 dB. The amplifier is all tube. Input transformer is enclosed in a MU-metal can. Input and output transformers come with a static screen between the primary and secondary wirings. The input and output are balanced as well as fully floating.

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