DIYAUDIO

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

• Rails: +/- 25VDC

• JFETs current: 8mA

• R10: 1V, R11: 1V

NOTES

• Complimentary Front End (BA-3) board from diyAudio Store

• Power supply in a separate chassis shared with Pearl 2 and Technics SL-1200 turntable

• Super Regulator board from diyAudio Store

• PSU board from diyAudio Store

• Galaxy 2U chassis from Hi-Fi 2000

• Matched Toshiba JFETs from FET Audio

• Matched Toshiba 2SK2013/2SJ313 MOSFETs

• Ladder type 25k stepped attenuator based on Seiden 4 pole 23 way switch and Nickel-Chromium thin film resistors 1/4W 0.1%

• ELMA 4 pole 6 way input selector switch

• Jensen JT-11P-1 line input transformers

RESOURCES

• Manuals: Burning Amp #3, Super Regulator

• diyAudio: The BA-3 as preamp build guide, BA-3 As Preamp, Burning Amp BA-3b (Balanced)

• Passive pre-amps: Goldpoint, hifi collective

Last update: 19.04.2020.