Unique Tube Line-level Mics Offered

home CTL-15 mic connection case with mics capsul power unit

Connection via Passive Attenuator

   Unlike common systems, the level is adjusted with the help of a passive step-by-step attenuator using a wafer switch with constant resistors. A standard potentiometer was found inapplicable because its inherent contact friction noise and high transfer capacitance heavily "impersonalized" and "smeared" the sound.
   A passive attenuator with a balancing transformer is also available.



pic.1   Connection via passive attenuator


Connection via Tube Transformless Buffer Amplifier

   A better performance is assured by connecting the mics via a tube buffer amplifier with a passive attenuator at its input. The amplifier operates in the pure class "" mode, with no negative feedback at all. The unusual circuit of the transformerless output cascade comprises two medium-power triodes with target impedance of the balanced output 200 Ohm (100 Ohm per arm).   See details->


pic.2   Connection via buffer amplifier



   It goes without saying, however, that the best results will be obtained by connecting the microphones directly to an analog-to-digital converter or a similar device with an unbalanced input and a 47-200 kOhm impedance.



   The proposed microphone system was experimentally developed in recording studios for a few years, again and again delighting indescribably every single singer.

   Interference immunity of the system was once given a severe test under highly exacting conditions of a large TV studio. No audible noise was noticed, even with a 20 m long microphone cable.




CTL-15 Tube Mic
CTL-15 Tube Mic
Case with CTL-15 Mics

Case with CTL-15 Mics
Power Unit

Power Unit
Neumann Capsul

Neumann Capsul


2004 Nikita Ivanov-Noman Esq.