The Sound of Silence: Lowest-Noise RIAA Phono-Amps: by Burkhard Vogel

By Burkhard Vogel

There is a large box of initiatives left which can in simple terms be satisfyingly attacked with assistance from outdated analog expertise. probably the most vital fields is that of amplifiers for analog indications - resembling for audio purposes.

The content material of this booklet will bring about reasonable phono amplifier layout ways that allows you to prove in lowest-noise recommendations round the corner from the sting of actual barriers set through room temperature and given cartridges - hence, absolutely suitable with very pricey so known as "high-end" or "state-of-the-art" deals on this day markets - and, from a noise viewpoint, mostly outperforming them!

In this 2nd version it's validated with effortless to stick to mathematical remedy that thought isn't really distant from truth. Measured signal-to-noise ratios of solid-state and valve designs, either then again pushed by way of transformers, could be chanced on inside 1dB off the calculated ones and deviations from the precise RIAA move will not pass the ± 0.1dB tolerance strains. also, the publication offers dimension set-ups and effects. hence, comparisons with size effects and attempt ways of try out journal can be mentioned too.

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It decreases with growing frequency with a slope of 3dB/octave. That slope must sound like pink noise! The cross-point of the two tangents of the constant value plot (white-noise region) with the 1/f-slope plot creates the 1/f-corner-frequency fce for noise voltage and fci for noise current. This is not the case at the higher end of B20k. In Figs. 3, this effect is demonstrated for the OP27. 5) formulae are given to calculate rms noise voltages and currents for any frequency band B ¼ fhigh À flow.

Deutsche Grammophon Gesellschaft no. 1099 112 or no. 1099 103: 1. 45 modulated and cut with a peak velocity of 8 cm/s on the L channel 2. 45 modulated and cut with a peak velocity of 8 cm/s on the R channel 3. 3 cm/s with o/p ¼ L þ R (sum of the two channels) 4. 791 mVrms per channel. Note 3a, 3b: same as Note 1! 3d. 9) Note 3c: Summing up the lateral modulated signals from each cartridge channel (eg. by switching the stereo/mono-switch to mono) would lead to a þ6 dB higher output level per channel (o/p ¼ L þ R).

49) With the respective data sheet figures and charts like the ones shown in Fig. 12a–c it becomes quite easy to select the right input device. a b c Fig. 12 (a–c) Noise figures of the low-noise transistor 2SC2546: NF versus source resistance and collector current10 at three different frequencies 10 Hitachi Data Sheet.

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