MM Phono stage PCB GE transistors JBL SG-520 clone

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Phono stage PCB board on germanium (GE) transistors (according to this scheme, it was installed in the JBL-SG520 preamplifier)

Phono stage MM, fully based on domestic germanium GE transistors GT308V, P416B, MP16B (USSR)

Corrector JBL-SG520. Standardly installed in preamplifier JBL-SG520 (USA 1960), (with RIAA correction)

The sound of the phono stage is detailed, bright - it looks like a "tube sound". The sound as a whole is very legible and soft, the scene has acquired volume and localization. Pleasant sound, with good soft bass, good "middle", a certain alloy of transistor detail and lamp heat.

Draw your attention !

You must have soldering skills and understand electronics!

The phono stage board is made according to the version of the “vs music” scheme. Special thanks to "vs music" for the work done. The corrector board has its own voltage regulator. It is also possible to supply voltage, both AC and DC. The power supply circuit of the corrector is implemented according to the developments of the 60s. Plus power is connected to the "ground". Therefore, to power the corrector, you need to use a separate power supply or transformer. It is highly desirable to place the corrector board in a separate aluminum or metal case, which serves as a screen ("ground").

Main characteristics:

Cartridge type : MM

Design - phono corrector on a GE transistor;

Frequency range, Hz: 20 Hz ... 20 kHz (frequency response +/- 2.0 dB);

Rated input sensitivity voltage: 3 ... 5 mV;

Output voltage: 0.500V; (500 mV)

Gain, dB 40dB

DC power supply (U): -23…-33 V

DC power supply (U): ~23…-~33 V

Current consumption (I): no more than 20 mA

Frequency response deviation from standard no more than +/- 2dB

Signal to noise ratio (unweighted) (SNR) > ~73 dB

Harmonic distortion (THD) less than 0.05%

Dimensions (W x D x H): 70x105x30 mm;

Scheme and recommendations for assembly and connection are included in the kit

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