Hi on Höfi's Pre Amp page
some more pictures
Had to cancel the MC tube pre-pre amp
several problems.
Bought a high output moving coil pick
up. Final pictures follow soon.
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Technical datas :
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Principle : shunted regulated push pull triode
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Tubes : phono stage double triode 12AX7A / ECC83 + 12AT7 / ECC81)
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Tube : line stage double triode 12AU7A / ECC82
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Accuracy RIAA : better than 0.3 dB of course with 1% MKP caps.
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Amplification : phono stage 44 dB / line stage 22 dB no feedback
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Frequency range : 20Hz - 100KHz ( + -1db )
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Signal noise ratio : phono stage 76 dB A / line stage 88 dB A over all
73 dB A
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Slew rate : > 6.4 volts a micro Sec.
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Distortion Uout = 1volt : < .001% 20Hz - 20kHz no feedback
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Outputimpedance : 2.5 K Ohm nofeedback 0.5 K Ohm with feedback
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Operating voltage voltages 310 volt phono stage 350 volt line stage
For any ideas or questions
send mail
Last modified 07.01.98 by Erich
Hofer
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