sE2200T microphone

[LevinGuitar]

Quite similar to the TBone SCT700 in circuit and probably parts (capsule, tube and transformer) but still different. The PSU is also a bit different, providing retarded anode voltage (until the heater reaches it's max voltage), and have a separate voltage for capsule polarization. There are a bit of psu noise in the signal, so the filtering is not optimal. The psu have vents in both sides, that is quite nice, but this allows a lot of dirt to enter inside.

Edit: schematic updated with pads. The low cut is a bit unusual for this mics.

 

[LevinGuitar]

Just for fun I tried to turn this circuit into a Rode NTV arrangement, with a E81CC tube. I like it, it really sounds NTVish even with the original K67 style capsule. Not bad option for a circuit mod, and quite reversible, no trace cuts are nessesary, only to lift the pin7 from the tube socket.

The only concern I have is that the grid is 62 volts above cathode for the first 30 seconds, unltil the B+ is activated