40 Volt panel light replacement - diyAudio
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Old 16th November 2011, 04:27 PM   #1
seebert is offline seebert  United States
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Default 40 Volt panel light replacement

The power on panel light in my preamp has gone. It's an encapsulated 'bulb' of some type inside a non-replaceable 5/16th diameter threaded chromed shell with retaining nut behind the panel. It is fed directly from a 40 volt DC supply line. Can someone please suggest either a direct 40V replacement (I have no idea what kind of light this is) or would it be okay to use a LED and resistor in place of the original. Looked at Mouser's site and I'm plainly baffled but that's not anything new. Thanks, Mike.
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Old 16th November 2011, 05:15 PM   #2
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If you can't track down a similar bulb, you could probably use a LED with a 1/2W 3900 ohm resistor. I'm a little confused by the "non-replaceable" shell description.
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Old 16th November 2011, 05:26 PM   #3
seebert is offline seebert  United States
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Hi sofaspud (great handle) ... many many thanks for the info and for giving me specifics which is a GREAT help. The 'shell' looks like an ordinary chrome plated through panel bulb carrier (with nut behind) where you could replace a blown bulb, but instead it's filled with hard yellowish resin, sort of encapsulated if you get what I mean. I thought it's be a simple and quick bulb change but oh well Best regards, Mike.
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Old 16th November 2011, 06:40 PM   #4
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OK thanks. I have a better idea of it. If the resin can't be drilled out, a replacement chrome shell can likely be found to fit your chosen LED.
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Old 16th November 2011, 11:26 PM   #5
Enzo is offline Enzo  United States
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And if you can find a similar looking lamp socket that fits the existing hole, you can easily use a lower voltage bulb with a series resistor, not unlike the LED approach.
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