CMV 551

Common name: Microtech Gefell CMV 551

Production Status: Discontinued / Vintage

The CMV 551 is a large diaphragm tube amplifier body with interchangeable screw-mount M 7 S, M 8 S, M 9 S, M 14 and M 55 K capsules. An included G/B (Bajonett-Gewinde) adapter allows mounting of non ‘S” Neumann bayonet capsules (M 7, M 8, M 9). It was first released in 1955. The microphone circuit is based on a EC92 vacuum tube and output transformer. The microphone is ideal for recording solo vocals, background vocals, acoustic guitars, percussion, strings and upright basses as well as an ambience microphone. The CMV 551 is powered by the N 551 power supply. This provides the microphone with a higher voltage than required by the successor CMV 563 and therefore later power supplies won’t work within specifications. MH 55 stand mount and TS 55 table mount were available. Weight shown is for amplifier body only, without capsule. Length includes NS 67 connector.

Electrical Characteristics

Frequency Response
30Hz - 20 kHz
Output Sensitivity
7 mV/Pa
Max SPL
120
Max SPL, THD:
0.5
Self Noise (CCIR)
dB
Self Noise (DIN/IEC)
dB-A
Output Impedance
200Ω
Recommended Load
1kΩ
Powering
Proprietary unit
Supply Current
1 mA
Alternative Powering
Tube Model
EC 92
Tube Brand
Nehaus

Switchable Options

Pad
Filter/EQ

Physical Characteristics

Connector
Neumann Gefell NS 67 5-pin male
Connector notes
Available Colours
Hammered Grey
Weight
330 g
Length
136 mm
Min diameter width
Max diameter
42 mm
Depth

Accessories

Included
N 551 Power Supply. G/B bayonet mount. 10 metre C 56 microphone cable MH 55 Stand Mount. Case.
Optional
TS 55 table mount. C 55 short Goosenck. W100 windscreen.