[sdiy] aging transformer replacement

[Robotboy8 at aol.com]

>Probably.  But I'd be inclined to be *sure* that it was the transformers,  
>first.  Take a rod,  non-metal,  and see if you can "probe" for that 
>vibration somewhere.  If it _is_ the transformers,  then maybe the 
>application of some silicone rubber would fix the problem.
>
>> or, is there some other way to cure the hum? it can be quite distracting.
>
>See above.  Another,  more likely cause,  is aging electrolytic caps,  
>particularly those large ones in the power supplies.  These seem to be quite 

>a common problem in a lot of equipment.

Electrolytic caps seem to usually be a problem on gear older than a Nord Lead 
to me.
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