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Hoffman Amps Forum image Author Topic: Pilot light  (Read 2415 times)

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Offline uki

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Pilot light
« on: April 24, 2019, 07:00:16 pm »
The pilot light in my amp burned 2 times in three years, does it burn that often? Last one was a GE47.
What should be the value on those little bulbs?
Theory is when everyone knows everything but nothing works, practice is when stuff works but nobody knows why !!!
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Offline sluckey

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Re: Pilot light
« Reply #1 on: April 24, 2019, 07:19:44 pm »
« Last Edit: April 24, 2019, 07:25:42 pm by sluckey »
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline PRR

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Re: Pilot light
« Reply #2 on: April 24, 2019, 10:19:12 pm »
Alternatively put a 10 Ohm 1/2W resistor in series to drop it to more like 4.8V. It will be dimmer and redder but about 30X the life or about 50 years. You might compromise with a 5 Ohm resistor.

This assumes "no shocks". If you drop the amp off the truck a lot, the filament will break.

It also assumes "good quality" lamps, and they are getting hard to find these days. Nobody cares. Incandescents are a dying industry, and they make them as cheap as possible.

Agree that I have gone LED almost everywhere. Even the 500 foot throw down my driveway, which I used to do with halogen and monster CFLs, is now LED.

Offline shooter

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Re: Pilot light
« Reply #3 on: April 25, 2019, 07:40:33 am »
Quote
I have gone LED almost everywhere
agreed, use a power switch with them built in, pitched the sodium vapor, garden didn't complain  :icon_biggrin:
Went Class C for efficiency

 


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