Manual

4
610B Specifications
Microphone Input Impedance Selectable, 500 W or 2k W
Balanced Line Input Impedance 20k W
Hi-Z Input Impedance Selectable, 2.2M W or 47k W
Maximum Microphone Input Level +18 dBu (2K input Imp. & 15 dB Pad in)
Maximum Output Level +20 dBm
Internal Output Impedance 80 W
Recommended Minimum Load 600 W
Frequency Response 20 Hz to 20 kHz +0, -1 dB
Maximum Gain 65 dB (500 W input impedance)
Signal-to-Noise Ratio > 90 dB @ maximum gain
Tube Complement One 12AX7A and one 6072A per channel
Power Requirements 115V/230V
Special Note:
The 610B is virtually identical to one side of a 2-610 with two exceptions. The front
panel –15dB Pad and a different power supply. We have added a MOSFET regulator to
the 610B’s High Tension power supply. This regulator, besides keeping the voltage
stable, reduces the supplies noise contribution to a negligible level.