[emajluf]

Hello everyone, I wish someone could help me to eliminate mechanical noise from my Bryston 9B SST (220 volts 50hz). When it is turned on it makes some noises, which then the same type remains somewhat more constant when it is ON, but sometimes decreasing and increasing it.

I've seen DC blockers around the internet that supposedly would reduce it but I'm not sure if it actually will. If so, which DC Blockers would you recommend for it? 

I would also like to protect you from Surge Protector. I am thinking of an ISOTEK EVO3 SIRIUS. https://isoteksystems.com/products/evo3-sirius/   

Already grateful for your help and time.

[cheater]

Are you talking about the hum of the transformer? That's normal. You just put the amplifier out of earshot.

[emajluf]

Hi Cheater, thanks for your reply. I do not know where the noise comes from, I am not a specialist, but I have had other amplifiers that do not emit any sound, so I feel that something is wrong. The 9B has 5 chassis channels each with its own toroidal transformer. The noise that is maintained when it is turned on is the same type that is heard when it is in the process of turning on for a couple of seconds, but it remains constant and with variations in volume.

[James Tanner]

Hi Cheater, thanks for your reply. I do not know where the noise comes from, I am not a specialist, but I have had other amplifiers that do not emit any sound, so I feel that something is wrong. The 9B has 5 chassis channels each with its own toroidal transformer. The noise that is maintained when it is turned on is the same type that is heard when it is in the process of turning on for a couple of seconds, but it remains constant and with variations in volume.

Hi

It may be the soft-start circuit - email Mike - mpickett@bryston.com

james