[R-390] Out from the shadows ...

[Tim Shoppa]

>  Before you run the radio one moment longer, pull the 
> audio deck and replace c609. That is an absolute must.

[C609 = the 8uF tantalum cap in the audio deck that leaks]

What's the big deal making this an absolute must?  It's
probably been leaking acid for a decade or two now.  Electrically
they work fine even when leaking.  I agree it's a good thing
to replace it but a little more acid dripping on the PCB won't
cause any immediate damage.  Worst case long term damage
is cosmetic damage to the PCB... have you seen worse?

I can think of a half-dozen other bypass/coupling caps that can actually
cause electrical problems (including seriously messing up bias on
tubes resulting in damaged tubes, burnt up resistors, etc.) with moderate
to large electrical leakage.

Tim.