Thanks for the answer, but the problem is not there. It is internal to the amplifier in my opinion.
The amplifier connected alone in the general electrical panel of the house on a socket associated with its 20A circuit breaker (all the other circuit breakers in the panel being off, only the 4B3 is powered), it hums.
I have been in email contact with Adam Tanner then Mike Pickett for this hum problem.
Several leads and tests without conclusive results were done in France, the 4B3 was sent back to Bryston in Canada to finally end up changing it for a new model.
Unfortunately, after unpacking and connecting, the brand new 4B3 hums like the previous one
Before disturbing Mike Pickett again, I wanted to carry out new tests. In particular, to eliminate any problem with my electrical installation, I took my brand new 4B3 under my arm and went to several friends in different cities. The 4B3 also hums at their place with the same constancy !
I sent an email to Mike two weeks ago to tell him about all my tests which unfortunately have no positive effects on the hum and to see what he thinks about all that. I am waiting for a response from him.
Important clarification, the distance between my listening position and the front of the 4B3 is 2.60 meters (8.53 feet if my conversion is correct).
I hear the hum in the low-level passages of classical or jazz music, the silences between the titles of an album and in the silences of the dialogues of films or when there is simply no music.
As I indicated in my presentation as a new member, I am a sound technician and therefore I have a good ear.
So I thought it was just me and that I was being too demanding
But family and friends who don't have the same hearing and sound experience as me also hear the hum !
I will eventually create a new post to explain everything that was done and the disappointing results so that you understand my distress...
