G
Guest
Guest
The secret is in a good mic transformer...
In brief, I bought cheap mics well made mechanically. Unfortunately, electronics is toyish, for example, pad switch thast is needed to attenuate for less distortions/noises on loud sound sources actually changes bias of the FET increasing both distortions and noises; 80 Hz HPF switch adds 15 times less interstage capacitor rolling of 6 db / oct everything needed and unneeded; output stage is made of 2 emitter followers loaded through cables on 6.8K phantom powering resistors, also 22000 pF caps are connected to output of that emitter distorters that rectifies high end of spectrum and modulates by envelope the entire signal.
What I did,
I used a 15K:150 Ohm tranny, and asymmetrical A class amp with voltage gain=11. The amp consumes 2 mA only, so no noisy RF voltage converter to bias a capsule is needed, also resulting headroom is huge, and THD is very low, and the lower the lower is the signal. I don't need colorations from microphones, so it's internal amp has deep-deep-deep NFB and low gain for medically grade stirilly accurate power amplification with as widest as possible dynamic range.
No more phoney -10dB and 80Hz switches.