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EB-199/320 ALL-FET Phono Preamp |
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The EB-199/320 is an ALL-FET MC phono preamp with 54 and 64 dB gain. RIAA accuracy is better than 0.1dB. It can handle all low-output MC pickups on the market. Due to its use of only FETs as active elements, it has an extremely high resolution and transparency. Together with the Caddock/Dale resistors, ELNA CERAFINE electrolytics and MICA capacitors they produce excellent dynamics, natural and transparent sound and offer super bass control. The ALL-FET Phono preamp outperforms most phono preamps on the market, irrespective of price.
The two channels of the EB-199/320 are laid out on one PCB, size: 240x145mm.. The phono preamp requires a power supply with ±24V at approx. 200mA per channel. Regulators are not included on the PCB, however ALL-FET regulators are available separately under the number: EB-202/254. A high current power supply and suitable mains transformers are also available, see our price list on the homepage.
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The ALL-FET phono preamp is using a two-amplifier approach, instead of the usual single amplifier. This allows you to optimize it for low noise, RIAA accuracy, high gain and dynamic range.
The first amplifier is a linear one, using 4 pairs of low-noise Cascoded JFETs at the input. The second stage is also made up of low-noise Cascoded JFETs. The output stage is a complementary MOSFET source follower. The gain can be changed with the feedback resistors to 30 and 40 dB. R28-C15 provides the high frequency roll-off of the RIAA equalization.
The second amp provides the bass boost of the RIAA curve. Except for the input stage, which is a complementary differential Cascode circuit, the amplifier has the same topology as the input stage. The second amp has a gain of 24 dB at 1 kHz, making a total gain of 54 and 64 dB for the phono preamp.
Due to the high gain at low frequencies, both stages are using servo control for DC-offset. The offset control is provided by low-noise JFET-input opamps. The opamps are supplied with ±10V from shunt regulators.
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