Arthur F48 Inputs
Yellow in
Yellow in


YELLOW IN is a high-voltage Class-A instrument preamplifier designed to be directly connected without using an external preamp, pedal or guitar amp. It can accommodate virtually any musical instrument pickup, or a passive electronic instrument.

ARTHUR FORMAT 48 is a modular mixer that can be designed and built by the user. Offering an unparalleled degree of flexibility, this mixer has already become a firm favorite with a number of leading artists and engineers.

A range of different modules can be combined in virtually any order and quantity in just a few minutes. These contain all the standard features you would expect to find on other mixer channel strips, as well as more innovative functions for enhancing workflow and ensuring best possible sound quality.

ARTHUR’s electronic design features a complete absence of Negative Feedback from input to output, resulting in ultra-fast response and natural attack. Circuits are built using single, discrete Class-A electronic components and pure high-voltage DC amps (with no capacitors in the signal path), offering 30dB headroom and low noise, as well as unparalleled stability, warmth and transparency.

Once the mixer is built, the unit sequence can still be customized and further modules added as required.

0.5 kg
Dimensions (LxDxH)
3.6 x 5.8 x 47.5 cm
Anodized aluminium assembled box
Total gain
54 dBu
Pad (attenuation)
15 dB
Max input level
24 dBu
Instrument In connector
1/4" jack unbalanced
Instrument In sensitivity
-42 to +9 dBu
Instrument In impedance
adjustable 20 to 800 kΩ
Main Out connector
through LR master module
Maximum output level
31 dBu
Main Out freq. response
50 Hz to 50 kHz
Insert/Direct Out
1/4" stereo jack - unbalanced
Insert/direct out level
30 dBu
Phantom power (nominal)
Stat power (10 VDC)
EQ Low
Shelving, +15 dB / -20 dB (@100 Hz)
EQ Mid
Parametric, ±15 dB (250 to 3 kHz)
EQ High
Shelving, ±12 dB (@4.5 kHz)
Warm: Low pass, 2nd order (cut freq. 2 kHz) - Low Cut: shelving, 2nd order (cut freq. 100Hz)
Distortion (THD+N @1kHz / 0dBu output)
0.11% (through L/R Master)
Class-A, no negative feedback, no integrated circuits
Audio Transformer
Power consumption
3.7 W (78 mA)
Through LR master module
Schertler SA
via Beroldingen 18
6850 Mendrisio

VAT number:
CHE-104.762.948 IVA 
  +41 91 630 0710
  +41 91 630 0711
Open a Ticket : Schertler Support

  +41 91 630 0710
  +41 91 630 0711
: FAQ-Generic Pt.8

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