Heathkit HD-1418 Active Audio Filter

High-pass filter:          5 pole tunable
     Range:                300 Hz to 2500 Hz at -6db

Low-pass filter:           5 pole tunable
     Range:                300 Hz to 2500 Hz at -6db

Notch/Peak filter:         2 pole tunable
     Range:                300 Hz to 2500 Hz
     Width:                200 Hz at 6db
     Depth:                30 db

Input impedance:           5 k ohm minimum

Nominal gain:              Unity

Audio amplifier power:     1 watt into 4 ohms

Input/Output connections:  One 1/4" phone jack (phones)
                           Three RCA type phono jacks (input, output & tape out)
                           One power connector

Controls:
     Low, Center           Tuneable high-pass filter or move bandpass center
     Notch/Peak            Tune notch/peak filter
     High, Width           Tune low-pass filter or adjust band-pass width
     Gain                  Adjust audio gain

Switches:
     Power                 Controls power and filter bypass
     SSB & Notch           Selects optimized SSB filtering with an adjustable notch
     CW                    Selects optimized CW filtering
     SSB                   Selects optimized SSB filtering
     SSB & Peak            Selects optimized SSB filtering with an adjustable peak
     RTTY                  Selects optimized RTTY filtering
     CW2                   Selects CW filtering, similar to CW with flatter bandpass
     Fixed                 Selects 300 Hz to 2500 Hz bandpass & disables variable controls

Power:                     7 to 13.5 vac or 9 to 18 vdc, 400 ma (Heath PS-5012 for 120 VAC
                           or PS-5024 for 240 VAC recommended)

Dimensions:                1 7/8" h x 8 7/8" w x 6 5/8" d

Weight:                    1.5 lbs