ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi
Whenever I turn off my Beomaster 901 and the volume is not muted, I get a a loud cracking noise form my speakers. Is this normal?
It's normal for a Beomaster 901 in need of new capacitors and a good switch cleaning.
It will always give a (occasionally quite heavy) thump sound from the speakers when switched on and off andwhen switching source but it shouldn't crackle.
Martin
Ok. I'm considering doing a capacitor replacement, but as i'm a real novice when it comes to electronics i'm not sure if i'm up for the job. What would a pack of new capacitors cost?
Any advice on switch cleaning? What to use for cleaning them?
The Beomaster 901 is not a very complex thing but - and don't get me wrong - electronics takesa little knowledge, education, skills and tools. And that goes for B&O things in particular. They are nothing likethe more-or-less standard stereos, you will normally find.If you are a complete novice with electronics I suggest you leave the restoration, because that's what itreally is, to someone with a little more experience.The electronic parts needed are pretty much standard components, not very costly, and it shouldn't take toomany working hours to replace capacitors and clean the switches, of which the latter could easily prove tobe the most tricky part since they would need almost complete disassembling to do it right.
ewqers: Ok. I'm considering doing a capacitor replacement, but as i'm a real novice when it comes to electronics i'm not sure if i'm up for the job. What would a pack of new capacitors cost? Any advice on switch cleaning? What to use for cleaning them?
If you never done it before, I suggest you start with something more easy, like a speaker crossover, and go from there, the 901 was one of my first 3 years ago, look here as Martin says, you will need some pre knowledge, and the right tools.
Collecting Vintage B&O is not a hobby, its a lifestyle.
A simple and important thing to do is to clean pot sliders. You can do it also without disassembling them Buy a good contact cleaner spray for electronic use as Philips and sprays it into sliders. Then move sliders and spray it again. Place some sheet of scottex under slider before, so you do not dirty the circuit boardNow you will not hear any scratch when you move sliders.If you hear a low noise as "mmmmm", it is a 100hz noise and you have to change the big capacitor of the power supplyDo not change all capacitor without reasons that is without testing them It is not cheap, it can not be very useful and set looks less "vintage" and original That is my humble opinion A capacitor must be changed only if it is damaged or if it has not acceptable valuesWhen you change the big capacitor you could place the new into the old so the look of circuit board of radio will be the same