The PM 1A is a combined mic preamp/DI, based on a classic TUBE-TECH design, but featuring even higher fidelity and a few new features: An impedance switch to match the input perfectly to all types of microphones, an overload indicator and 2 dB gain steps.

Serious listening tests of the PM 1A have revealed a sound quality second to none, placing it among a handful of the worlds very best designs.

The PM 1A DI continues the TUBE-TECH tradition of extremely good sounding DI’s, delivering world class sound for bass and guitar DI recordings. You simply won’t find a better DI than this!

Note: 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.



  • All-tube design featuring push-pull output amplifier
  • Frequency response @ -3 dB: 5 Hz to 60 kHz
  • Typical noise: 5 dB @ 200Ω
  • 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 Ω/1.2 kΩ/2.4 kΩ
  • 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 MΩ
  • MU-metal shielded input transformer
  • In- and output are transformer balanced and fully floating


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.


Sound Examples
Uncompressed Video TUBE-TECH RM Recording (Please be patient, Heavy file!)

Other RM recording projects:
The Living Room Recording Project
Trio Klezmer

Download a session to your own DAW and listen to the full and detailed sound of the PM1A

TUBE-TECH Mic pre recordings ( Session download.)
Drum multitracks ( Session Download.)
The Blue Wall project ( Link.)
Classical, Nigttingale String Quartet ( Link.)




RM Series Downloads

Manual RM2
Manual RM8
Manual PM1A
Manual EM1A
Manual CM1A

Tech Spec Sheets:
Specs PM1A
Specs EM 1A
Specs CM 1A

RM System

Recall Sheets:
Recall Sheet PM1A
Recall Sheet EM1A
Recall Sheet CM1A

Hi-res Images:
RM8 Perspective
RM8 Front
RM8 Rear
RM2 Perspective 1
RM2 Perspective 2
RM2 Perspektive 3
RM2 w.2CM1A Perspective
RM2 w.Micpres
RM2 Front
RM2 w.2CM1A Front
RM2 Back
RM2 at Console
PM1A Front
EM1A Front
CMA1 Front
PM1A Side
EM1A Side
CM1A Side