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The "goo" that is in the picture above is most likely glue placed to keep the electrolytic capacitor from moving during shipping. Sansui did the same thing in its receivers.
But this thread has moved in the right direction. I have personally experienced the same problem and it was electrolytic capacitors that were going south in Blonder Tongue Agile Modulators. They are easy enough to replace and you can get some 105°C capacitors that will likely outlive me. Easy fix and permanent fix for sure.
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