The preamplifiers
The microphone preamplifiers Type MMP4000-S and MMP4000-T
are part of the modular microphone system to be used with the
Modular Microphone Cartridge Type MMC4041. Both microphone
preamplifiers are supplied with 130V via the HMA4000 microphone
a mp l i fi e r, enabling them to handle all high level outputs from th e
m i c rophone capsule without adding any dist o rtion to the signal.
Please see full specifications for how the choice of preamplifier will
influence the specifications of the complete microphone.
The tube preamp l i fier MMP4000-T off e rs a slight musical 2nd
harmonic distortion colouration and uses a pentode vacuum tube
driven as a cathode follower in a transformerless class A unity gain
output st a ge. The special quality sub-miniature vacuum tube is
‘heated via 6,3V supplied by the HMA4000 Hi-Voltage Microphone
Amplifier.
For supreme transparency, the MMP4000-S solid-state preamplifier
design is identical to the discrete transistor output stage used in
the DPA range of hi-voltage microphones. Like the output stage of
the tube preamplifier, the transistor output stage is driven as a class
A unity gain impedance converter.
Designed for use in common pro audio environments where 48V
phantom power is a defined s tandard, the 4041-SP does not require
the HMA4000 hi-vo l ta ge amp l i fi e r. But due to the limited vo l ta ge
supplied to the preamp, 10 dB less SPL handling is the price of th e
48V choice. The preamp l i fier is transformerless in its design.
All microphones are supplied with an individual calibration chart stat-
ing the self-noise, sensitivity and the individual frequency response.
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