Beolit 707 Hum

4 replies
R(
Ramzis (archived2)
Bronze
3 posts
Posted August 1, 2018 at 20:52 GMT
#2109844

hello

My 1975 Beolit 707 has a background hum on all the bands. Its reception is great and its sound too but there is a background unusual hum.

could it be a capacitor? Anyone has faced a similar problem?

 

thanks

ramzi

DI
Dillen
BronzeModeratorFounder
12777 posts
Posted August 1, 2018 at 23:08 GMT
#2109845

Are you using it on batteries or mains?
If on mains, check the filter capacitor and the rectifier diodes. 

Martin

R(
Ramzis (archived2)
Bronze
3 posts
Posted August 2, 2018 at 08:52 GMT
#2109846

Hi Martin,

I am using it on the mains. Shall I replace the capacitor and the 2 diods in the power supply? 

Do you knows their values?

I was unable to read the value of the capacitor...perhaps a 1000uF or 100uF? 

What about the value of the 2 diods? 

 

Thanks,

Ramzi 

 

 

DI
Dillen
BronzeModeratorFounder
12777 posts
Posted August 2, 2018 at 15:47 GMT
#2109847

Are they bad?

Martin

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