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I once read an article about using a lightbulb as a power attenuator on small amps. I cannot remember the details but basically some of the power going to the speaker is dissipated by lighting the bulb. What was also cool is that the attenuation kicked in as your playing got louder; this would be great because soft playing wasn't attenuated as much but when you laid into the strings the bulb would brighten and suck more power!

Does anyone know anything about this or am I nuts?

TG
 

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This is done to protect high frequency drivers in small PA systems (Yorkville does this in some of their systems). They ase an 1157 12 volt brake light and socket.

It works like a compressor to protect the horn driver and if you drive too hard into it, hopefully the bulb pops before the driver does.

If you've ever wondered why your PA cabinets were lighting up, this is why.
 

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And Ampeg uses them in bass cabs to protect the horn, (which I never use)
 
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