Heathkit TM-1626 Stereo Microphone Mixer

The Heathkit M-1626 Stereo Microphone Mixer is a 2-channel mixer
for use with tape recorders, public address amplifiers, sound
reinforcement systems, and audio visual presentations. It features
four microphone inputs and two high-level auxiliary inputs.

SPECIFICATIONS

* The following specifications were obtained with the Mixer operating into 600 ? loads with all undriven inputs terminated as follows:

Microphone, Low . . . . . . . . . . . .  150 ohms

Microphone, High. . . . . . . . . . . .	 47 kohms

Auxiliary . . . . . . . . . . . . . . .	 47 kohms

Gain at 1000 Hz . . . . . . . . . . . .  Microphone, Low: +60 dB at output, +21 dB at mixer bus
					 Microphone, High: +37 dB at output, -2 dB at mixer bus
					 Auxiliary Input: +16.5 dB at output, -22.5 dB at mixer bus

Input Sensitivity for 1.0 volt/Output .  Microphone, Low: 1 millivolt, approximately
					 Microphone, High: 14 millivolts, approximately
					 Auxiliary Input: 150 millivolts, approximately

Frequency Response. . . . . . . . . . .  +/- 1 dB from 40 Hz to 20 kHz

Maximum Output Hum & Noise. . . . . . .  20 Hz to 20 kHz	300 Hz to 20 kHz
					 ---------------	----------------
  All controls maximum			   -50dBV		    -60dBV
  All controls minimum			   -85dBV		    -85dBV		

Input Impedance . . . . . . . . . . . .  Microphone, Low:  1100 ohms
					 Microphone, High:  170 kohms
					 Auxiliary Input:  100 kohms
					 Mixer Bus:  3000 ohms

Output Impedance. . . . . . . . . . . .  150 ohms

Distortion. . . . . . . . . . . . . . .  Less than 0.5% total harmonic distortion from 50 millivolts to 6.5 volts

Input Overload for 0.5%
Total Harmonic Distortion . . . . . . .  Microphone, Low:  60 millivolts minimum
					 Microphone, High:  900 millivolts minimum
					 Auxiliary Input:  3.0 volts minimum
					 Mixer Bus:  200 millivolts minimum

Phase . . . . . . . . . . . . . . . . .  All inputs and outputs are in phase with pin 3 of the microphone inputs

Peak Indicators . . . . . . . . . . . .  Adjustable from 50 millivolts to full output


Power . . . . . . . . . . . . . . . . .  15 watts

Dimensions. . . . . . . . . . . . . . .  5-3/16” high, 16” wide, 9-7/8” deep

Net Weight. . . . . . . . . . . . . . .  8-1/2 lb.