Heyya 90 lovers.  I have discovered 1 problem with my M90.  If I select 'RADIO' with the lower left toggle, the left channel is intermittent as if the channel is shorting to another component.  TAPE & LINE-IN are perfect.  If on radio & I wiggle the toggle that selects the noise reduction type for tape, the problem rights itself temporarily until speaker vibration kicks it out again. 

It's got to be a simple fix, I just don't know where to start looking.

Any ideas?  Please help me sort this out. 

Cpl

get a tin of servisol/switch cleaner and with the power all off squirt it into the relevant switches.....this stuff works marvels for electronic switches and can cure even the silliest of faults

Hey Chronic

I had the same issue on my 90 and I wasn't only the RADIO select switch that was a tad oxidized but also the FM/ AM /SW switches.

Cycle those switches back and forth a few times and you'll see it'll go away. At some point though a little Deoxit will be required