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  1. #1
    Junior Member
    Join Date
    Sep 2019
    Location
    usa
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    2

    Bryston 4b Help Left channel light stays red on start up

    Hi,
    I have an old 4b that i'm trying to get working again. The power switch on the front went bad so I ordered a new soft start board with the switch and soldered it in. The switch is working but now on the Left the led stays red - Any ideas of where to start troubleshooting? I haven't hooked up any source or speakers to see if it passes audio.
    Many thanks,
    J

  2. #2
    Super Moderator
    Join Date
    Apr 2013
    Location
    NY
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    18,726

    Re: Bryston 4b Help Left channel light stays red on start up

    Welcome to the forum.
    Fleetwood Deville by Oswald Mills Audio, Vienna Acoustics Haydn Jubilee, Wharfedale Linton w/ stands, Klipsch RB-75, Klipsch RP-160M.

    Job INTegrated. Luxman L-595aSE

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    First Watt SIT-3, Job 250 Monos, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos. Absolute Audio Labs PCF 25 amp (improved First Watt F7 super clone)

    Topping D90, RME Audio ADI-2 DAC FS, ModWright Ultimate Sony XA-5400ES.

    Burmester 948, McIntosh MCLK12, Kimber Kable, Siltech, Cardas, Avanti Audio cables.

  3. #3
    Junior Member
    Join Date
    Sep 2019
    Location
    usa
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    2

    Re: Bryston 4b Help Left channel light stays red on start up

    Quote Originally Posted by joeinid View Post
    Welcome to the forum.
    Thanks Joe - any ideas on getting this fine amp in service again!

  4. #4
    Senior Member
    Join Date
    Apr 2017
    Location
    Central FL
    Posts
    792

    Re: Bryston 4b Help Left channel light stays red on start up

    Welcome! Staying red I'd guess is saying it remains muted after start-up. Call Bryston service in Vermont - (802) 334-1201
    Main System - Lumin U2, Modwright LS36.5 DM Preamp, VTV Purifi 1ET-7040SA with tube buffer, EMM Labs DAC 2X (ver. 2), Torus RM-20, Thiel CS 3.7s, 2 Rel S/812 subs
    Back-up 1 - Premium Audio mini Gan Amp, Oppo 103D, 2 Richard Gray cond, Selah SA-2s, Sumiko S5 sub, Teac UD-503 DAC, Carver (modded) C-9
    Back-up 2 - Onkyo TX-NR797, Panasonic DP-UB820, Vansevers cond, B&W P6s, PowerSoundAudio S1500 sub

  5. #5
    Senior Member
    Join Date
    Sep 2017
    Location
    Boynton Beach, FL
    Posts
    1,010

    Re: Bryston 4b Help Left channel light stays red on start up

    Bryston support is the best in the business. They’ll take care of you.


    Sent from my iPhone using Tapatalk
    Preamp/Digital: Meitner MA3
    HT Processor: Bryston SP3
    Amps: Bryston 14b3, Bryston 4b3
    Speakers: Kef Reference 5, Kef Reference 4c
    Sub: REL Carbon Special
    Power: Shunyata Denali, Bryston BIT15
    Wires: Wireworld Silver Eclipse XLR & SC, Ethernet - WW Platinum USB
    Other: Stillpoint Ultra SS, ISO-Acoustics ISO Pucks

    -Kyle

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Bryston 4b Help Left channel light stays red on start up

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