Description

Grama-phone stereo Balanced input Preamp

I have supplied to this circuit from a very smooth +-35 supply that is being used by the amplifier. The input resistors should be raised away from the board and consider using a similar strategy to isolate the heat from the nearby electro Caps. The preamp uses NE5532s as they are cheap and the selected ONSEMI ‎NE5532D8R2G‎ has a 40vdc supply span. You could use others NE5532s if you reduce the 78xx, 79xx to lower voltages to suit. You could also use modern drop-in op-amp replacements as they all seem to have larger supply spans but check the pinouts. I have used higher spec Caps to maximise performance and massively over-engineered power supply to each IC. You could take shortcuts here if you want.

Schematic and Layout

Schematics

MC Pre-amp.png

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Jul 18,2026

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Grama-phone stereo Balanced input Preamp

2 Layers PCB 49.99 x 98.5 mm FR-4, 1.6 mm, 1, HASL with lead, Green Solder Mask, White silkscreen

A preamp for a Gramaphone that uses the Amplifier Power Supply

Published: Jul 18,2026

Standard PCB

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