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Block Diagram
The input selector selects amongst six inputs. The signal selected on the input selector is buffered and output to tape1 and tape2 for recording.
The signal delivered can be either the one specified on the input selector, or the output from tape1 or from tape 2.
The two channels, left and right, can be blended if desired, using the MONO switch. Therefore, the balance signal is presented with either
independent left and right signals, or identically summed LEFT+RIGHT signals if the mono switch is selected.
The output of the balance control is processed in tone controls. The tone controls may be bypassed. The output of the tone control bypass switch goes
to the MONO relay. When activated, it combines the left and right signals into a common signal. From there the signal, in either stereo or mono
form, passes through the HUSH relay to the volume control. When hush is activated, the signal level out of the preamp drops by about about 14 dB.
That’s handy in two cases:
1. If you often run your stereo at background levels, it puts the volume control into a sweet spot for those low levels.
2. If someone enters the room to talk with you, then a quick push of the HUSH switch lets you converse, the quickly return to your previous
volume level.
The outputs to amp A and amp B may be muted or enabled by the switches following the volume control.
The power supply, not shown in the block diagram, provides regulated +12V, -12V, and +5 Volts. The +/-12V powers the analog circuits. The +5V
runs the controller circuits, remote control receiver, motor pots, and the relays. The power supply may be hard-wired for either 120V or 240 Volt
inputs.
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