[TenTec] [] Running a Century 21 on external 12V power

[Stuart Rohre]

Oh Josh, now I see why you called them tropical fish!!  Get any cracked 
capacitor out of your circuits as quick as you can handle a soldering 
iron!  But have replacements of tubulars on hand first.

Cracks mean humidity has violated your capacitors and next the smoke 
will be let out.

I agree likely magnetic coupling issues are your main problem.

Stuart Rohre
K5KVH