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free bryston 4b resurrection
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Old 4th March 2014, 11:04 AM   #1
stuie25 is offline stuie25  Canada
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Default free bryston 4b resurrection

I recently picked up a dead 4b for free. It was pretty obvious someone had had it apart and its had a hard life. Upon first power up i had nothing no lights or noise of any kind, and the meter showed no dc voltage on the top of the capacitors.

They connected the left and right power switch outputs together on one terminal strip instead of to the left and right transformers. That got me a green light on one side and a blown fuse on the other. Checked more wiring and discovered the output wires from the capacitors to the back power board had been switched changing the voltage to who knows what. Fixing this and replacing the fuses with the spec 7.5a and that gave me two green lights.

Upon testing i have one channel that sounds ok and one channel that has a lower clipped sounding output.

My electronic component troubleshooting experience is limited. Where would be a good place to start looking.


Last edited by stuie25; 4th March 2014 at 11:07 AM.
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Old 4th March 2014, 12:06 PM   #2
jkuetemann is offline jkuetemann  Canada
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My thoughts would be to start by looking for failed outputs and collateral damage. Go to Bryston's web site and get the schematic for your amplifier, most are freely available right from Bryston.
---Jason Kuetemann---
Power is only granted to those willing to lower themselves enough to pick it up.
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Old 7th March 2014, 01:09 PM   #3
stuie25 is offline stuie25  Canada
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so i let a local guy that repairs guitar heads take a look and he found and replaced 4 bad resistors. I will pick it up this afternoon and take another test listen.

If its the audio seams balanced side wise i will start ordering replacement parts for a refurb.

Where is the best place to order high quality components.
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Old 7th March 2014, 03:53 PM   #4
ashok is offline ashok
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free bryston 4b resurrection
Digikey, Partsconnection, Partsexpress,Farnell, ......these names might not be spelt right.
Look under " Design and build / Parts " on the left panel on the Home page. You should get a lot of places mentioned. I haven't looked , but I guess they must be there.
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Old 7th March 2014, 05:21 PM   #5
tvrgeek is offline tvrgeek  United States
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Mouser, Allied, Newark...
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