MEC Introduction

MEC-50 and MEC-100 come as potted and tested modules. They are intended to either upgrade existing tube amplifiers, or build new. They are not suited as choke input filter nor as active anode load, as they do not store energy.    The MEC-100 is $42.00.  The MEC-50 is $38.00.

General Description

Designers Menno Vanderveen and Guido Tent decided for these designs after the positive response of the E-choke, in 2009. MECs typically fill the gap towards smaller power amplifiers (100mA) and preamplifiers (50mA) where the E-choke is too big.  Multiple MEC modules can be used in the same amplifier to helps split the load between several modules, with an MEC100 on the output stage and MEC50 on input/driver stages.  

MECs replace traditional chokes that generally work quite well, but suffer from serious disadvantages: 
• high weight 
• big size 
• magnetic field radiation that induces hum in the circuit 

The MECs effectively solve all these issues, and offer up to 60dB supply ripple reduction 

Technical description & manual

See the manuals: 
• MEC50 / MEC100 (English) 

Specifications

Electrical MEC-50 
• maximum current 50 mA 
• maximum input Vdc 800 V 
• internal current limit 68 mA 
• equivalent inductance 78 H 
• maximum voltage drop @ Imax 12 V 
• short circuit protection: No 
• protected for reverse connection: Yes 
• maximum heat production 0,7 W 
• minimum capacity C1 27 uF 
• optimal capacity C1 = C2 47 uF 

Electrical MEC-100 
• maximum current 100 mA 
• maximum input Vdc 800 V 
• internal current limit: no 
• equivalent inductance 10 H 
• maximum voltage drop @ Imax 9 V 
• short circuit protection: No 
• protected for reverse connection: Yes 
• maximum heat production 0,9 W 
• minimum capacity C1 47 uF 
• optimal capacity C1 = C2 100 uF 

Specifications

Mechanical 
Module size: 26*15*15 mm (W*L*H) 
Hole pitch: 14 mm (symmetrical). All pin diameters 1.0 mm, pin length 9 mm 
Mass: 12 gram

Warranty

This module is guaranteed for 5 years, assuming all mounting instructions are followed.