OVERVIEW The circuit design is referenced to Grounded Ground preamplifier which can be found in earlier wireless radio applications which requirie to meet high signal-to-noise ratio (SNR) and wide bandwidth requirements. For audio application, it is capable of creating high dynamic responses and quiet background which perserves the originality of the beauty of audio signals with neglectable distortion due to the simplicity of the circuits. Also, thanks to the differential pairs of the input stages, it rejects most of common-mode noise and has high PSRR. This grounded grid (GG) preamplifier will not make any artifacts to the sound and play 100% originally and naturally.
1. Circuit design reference to Grounded Grid tube preamplifier.
2. Three vacuum tube 12AU7 for amplification.
3. Use of Solen / WIMA MPK10 capacitors, Nichicon FW capacitors, BHC Averox / Philips BC capacitors, and Dale resistors.
4. Power requirement: 110-115V AC/220-240V AC 50/60Hz