Very interesting small diaphragm cardioid dynamic microphone.
Sounds bright and there is some hiss. It is so much proximity compensated than one can sing at 0in with natural sound
Opening it carefully by removing the sticker the circuit was as follows. One side of the capsule is connected to Tuchel out. The other side is connected to Tuchel out through a 100nF ceramic capacitor. This explains the very high frequency cutoff. When the switch goes from music to voice a 2.2KΩ resistor is connected in parallel with Tuchel out, further increasing HF cutoff.
The capacitor was bypassed to hear the capsule and it has a very full sound.
A Pleiades bass cut filter was made with Magnetec 060 core. 45 turns of Teflon insulated wire wrap wire gave 75mH inductance. The 2.2K resistor was left in place so at the V position there would be this inductor in parallel with 2.2K. Would this resistor reduce too bright HF? Everything was flitted inside, and the mic closed.
The sound was very interesting, the optimum distance for 75mH//2.2K was about 4in.
With an external 52mH Pleiades XLR adaptor filter it was approximately 2-3in and there was more voice signal as the small capsule received a greater percentage of the spherical voice wave.
With 25mH one could sing at 0in to the mic with natural and loud sound. There was some air noise problem.
From all the combinations perhaps the 4in 75mH//2K2 is the best or 3in with less added parallel inductance ,more experiments are needed.
In general an inductance of 80mH seems to compensate for 4in distance for many microphones.
And microphones seem to capture a natural sound at about 4in although one can hear an untreated room at >1in and signal is somewhat less strong. More experiments are needed with a very low noise amplifier such as Pleiades V5 EF183 battery electron tube only preamplifier.
Setup:
Paso M8 - Sony TC-D5 pro- Sennheiser HD580
Sounds bright and there is some hiss. It is so much proximity compensated than one can sing at 0in with natural sound
Opening it carefully by removing the sticker the circuit was as follows. One side of the capsule is connected to Tuchel out. The other side is connected to Tuchel out through a 100nF ceramic capacitor. This explains the very high frequency cutoff. When the switch goes from music to voice a 2.2KΩ resistor is connected in parallel with Tuchel out, further increasing HF cutoff.
The capacitor was bypassed to hear the capsule and it has a very full sound.
A Pleiades bass cut filter was made with Magnetec 060 core. 45 turns of Teflon insulated wire wrap wire gave 75mH inductance. The 2.2K resistor was left in place so at the V position there would be this inductor in parallel with 2.2K. Would this resistor reduce too bright HF? Everything was flitted inside, and the mic closed.
The sound was very interesting, the optimum distance for 75mH//2.2K was about 4in.
With an external 52mH Pleiades XLR adaptor filter it was approximately 2-3in and there was more voice signal as the small capsule received a greater percentage of the spherical voice wave.
With 25mH one could sing at 0in to the mic with natural and loud sound. There was some air noise problem.
From all the combinations perhaps the 4in 75mH//2K2 is the best or 3in with less added parallel inductance ,more experiments are needed.
In general an inductance of 80mH seems to compensate for 4in distance for many microphones.
And microphones seem to capture a natural sound at about 4in although one can hear an untreated room at >1in and signal is somewhat less strong. More experiments are needed with a very low noise amplifier such as Pleiades V5 EF183 battery electron tube only preamplifier.
Setup:
Paso M8 - Sony TC-D5 pro- Sennheiser HD580
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