Burning Amp BA-3 Front End
Designed by Nelson Pass. Class A pre-amplifier without negative feedback loop. More details on First Watt website.
MEASURES
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Rails: +/- 25VDC
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JFETs current: 8mA
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R10: 1V, R11: 1V
NOTES
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Complimentary Front End (BA-3) board from diyAudio Store
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Power Supply in a separate chassis
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Super Regulator board from diyAudio Store
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Galaxy 2U chassis from Hi-Fi 2000
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Matched Toshiba JFETs from FET Audio
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Matched Toshiba 2SK2013/2SJ313 MOSFETs
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Ladder type 25k stepped attenuator based on Seiden 4 pole 23 way switch and Nickel-Chromium thin film resistors 1/4W 0.1%
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ELMA 4 pole 6 way input selector switch
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Jensen JT-11P-1 line input transformers
ATTENUATION DETAILS
BLOCK DIAGRAM
RESOURCES
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Manuals: Burning Amp #3, Super Regulator
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diyAudio: The BA-3 as preamp build guide, BA-3 As Preamp, Burning Amp BA-3b (Balanced)
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Passive pre-amps: Goldpoint, hifi collective
Last update: 24.06.2017.