Pioneer RG-1

All pre-owned product is tested in our service department and have been passed for sale... and comes with a 90 day warranty!

In good condition - Cabinet has seen a bit of wear, but this still works great! Original box and packing are NOT included, but we will pack carefully.

Very cool unit!  Circa 1975-77. See last image for specs.

From Pioneer:
Tha Pioneer RG-1 operates only on musical signal content, reducing background noise to insudible levels while enhancing or expanding the dynamic range of the musical signal itself. The latter function can bo explained as an expansion of level variation, and since the expander circuit is designed to re-balance rather than simply pass on a given signal, the input and output values are not necessarily linear. the expancer circun consists mainty of d hat wrequency response gain control amplifier (GCA) and a sensor section which produces the signal to control the gain of the GCA. There are two such circuits, of course, since the RG-1 is built for stereo.

THE SENSOR CIRCUIT: After passing through the Input Level Control and buffer amplifier, the total musical input signal is sent to both the sensor section and to the GCA. In the RG section of the sensor circuit, a peak detector (ripple-cancelling type) produces a DC output proportional to the peak values of the musical input signal. The output from this circuit then becomes a gain control signal lon the GCA.

THE GAIN CONTROL AMPLIFIER: The input signal is simultaneously sent to the GCA itself. The control signal from the sensor circuit is employed to determine the open-loop gain of this section, and the gain there increases in accordance with the input. A fixed gain (- 3dB) is applied to small input signals (those from 0 to 5mV, input level: MAX), while variable gain is applied to those larger than 10mV. Any signal with higher than 300mV is also handled with a fixed gain.

DYNAMIC EXPANSION SWITCH: The front panel of the Pioneer RG-1 features this 5-position control to let you enhance any musical input trom 6db to 14dB in steps of 2dB each. The circuit selects the precise amounts of NFB (negative feedback) which are returned to the input section, thereby determining the ultimate gain at high input levels. Finally, the GCA output is obtained through another buffer amp, and to prevent excessive gain difference between the two channels (left and right) from producing an unnatural effect during stereo playback, the two are mixed by a blending resistor at teh sensor section output.

INDEPENDENT LEFT & RIGHT CHANNEL METERS: The attractive front panel of the Pioneer RG-1 includes two large, self-illuminated level meters which accurately indicate the output of the unit and allow you to keep close control of its dynamic-range-expansion effects by Dynamic Expansion Selector. This is your answer for geting the most out of today's improved stereo records and tapes.