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Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

Legacy Record Preamp Photos

On the front panel there are three rotary switches. The switch to the left is the function switch. It routes the signal from the phono either to the inputs of the stereo preamp, the signal from the left side of the cartridge to the mono preamp, the sum of the left and right outputs of the cartridge to the mono preamp, and last the signal from the right side of the cartridge to the mono preamp.

Note the small toggle switch to the right of the first knob. It selects lateral or vertical records either by not inverting the left channel or inverting the left channel.

The second knob selects the bass turnover frequency. There are six choices of turnover frequencies as well as a flat position. The rumble shelf is a decade below the turnover frequency. The turnover components are chosen to give the same gain at 1 kHz for all the turnover frequencies.

The knob to the right is to select the treble cut frequency. There is a choice of seven frequencies as well as a flat position. It is more typical to give the attenuation at 10 kHz however stating the corner frequency makes more sense to me. 700 Hz is probably not a frequency which was used but I included it so a constant amplitude setting could be had by choosing 700 Hz for both the treble cut and bass turnover.

The small toggle switch is the power on switch with a power on indicator LED above it.



At the lower left of the rear panel is the power cord. Moving to the right are the mono output jacks. They are identical. They connect to the aux inputs of the stereo system. The upper right RCA jacks are the inputs into which the phono cartridge is connected. The RCA jacks below the input jacks are to pass the output of the phono cartridge to the input of the stereo preamp. Slightly to the left of the low level RCA jacks is a turntable ground terminal.



Under the Hood. To the very right is the fairly conventional power supply providing about + and - 8 volts to the active circuitry in the preamp.
To the left of the PS is a shield through which the power leads pass.
The preamp is constructed using mid 20th century practice except for solid state amplification rather than vacuum tubes.





-

Phil


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Topic - Legacy Record Preamp Photos - coffee-phil 00:44:16 07/4/10 (21)

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