FM Stereo not switching - help please?


New member
Username: Idealist

Bullaburra, NSW Australia

Post Number: 1
Registered: Dec-05
I have an old Sansui 800 receiver, which works well, but now doesn't switch into stereo with a strong stereo signal. This happened after I lent it to someone. (hmmmmm...)
I understand the basic theory of FM detectors, but am hazy on the theory of stereo switching, and can't find anywhere a simple explanation of multiplex decoding.
The unit is solid state discrete transistor circuitry, and I have a circuit diagram.
Grateful for any assistance.


Gold Member
Username: Jan_b_vigne

Dallas, TX

Post Number: 7107
Registered: May-04

The tuner could need a thorough cleaning or there is more likely a capacitor or two that needs replacement.

Gold Member
Username: Jan_b_vigne

Dallas, TX

Post Number: 7114
Registered: May-04

I should have included in the term "cleaning" that the tuner is likely to also need realignment.

Bronze Member
Username: Harrypalmer

Bellevue, WA

Post Number: 16
Registered: Feb-06
Yeah right and electric cream and tinfoil antennas. I get it.
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