Beogram 5500 speed not steady (wows ?)

9 replies
IS
Offline
Ismo
Bronze
Posted January 24, 2022 at 19:25 GMT
#2227395

Hi,

Another problem noticed with old 5500 Beogram. The speed changes slightly during LP play. It can happen at any point of the play. It is hearable in the music and really annoying when it happens.

I suspect that the belt of the motor-flywheel is worn too much or gotten a bit longer, since it is the original belt. And this player has been stored in below 0 temperature at one point. 

I noticed that the belt does not stay in center at the motor axis side. BTW why it is shaped elliptical, the part at motor axis where belt runs ?

Can someone confirm this that its only the belt problem. I would appreciate if someone has the knowledge of this.

I try to add couple pictures to illustrate what I mean. Belt in the center or dropped down of motor axis.

Ismo

IS
Offline
Ismo
Bronze
Posted January 24, 2022 at 19:33 GMT
#2227396

Photo

IS
Offline
Ismo
Bronze
Posted January 24, 2022 at 19:35 GMT
#2227397

Belt down photo

DI
Offline
Dillen
BronzeModeratorFounder
Posted January 24, 2022 at 22:11 GMT
#2227398

The pulley is barrel-shaped to hold the belt at the center of the pulley.
If the belt creeps down, the upper part of the belt will be tighter than the lower, thus pulling it up - and vice versa.
Your belt is badly worn. New belts are available

IS
Offline
Ismo
Bronze
Posted January 25, 2022 at 07:29 GMT
#2227399

Thanks a lot for quick answer. This is really appreciated. 

Ismo

 

R(
Offline
RichardIII (archived2)
Bronze
Posted January 25, 2022 at 08:33 GMT
#2227400

Really appreciate your replies Dillen, helps others out as well.

R(
Offline
RichardIII (archived2)
Bronze
Posted January 30, 2022 at 11:40 GMT
#2227401

I have a similar question now. I'm replacing the belt on my Beogram 9500 because of the exact same issue: wows, no steady rpm, when playing a record.

So I noticed this little cylinder next to the motor. At the moment the belt goes around it, but should it?

DI
Offline
Dillen
BronzeModeratorFounder
Posted January 30, 2022 at 14:16 GMT
#2227402

No.
The belt must only touch the pulley.

Martin

IS
Offline
Ismo
Bronze
Posted February 5, 2022 at 19:52 GMT
#2227403

New belt works great. Steady sound now. Also adjusted the plate at center and lifted it up a bit.

 

Ismo

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