40 Volt panel light replacement

seebert · 16th November 2011, 04:27 PM

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.

sofaspud · 16th November 2011, 05:15 PM

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.

seebert · 16th November 2011, 05:26 PM

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.

sofaspud · 16th November 2011, 06:40 PM

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.

Enzo · 16th November 2011, 11:26 PM

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.

16th November 2011, 04:27 PM	#1
seebert diyAudio Member Join Date: Sep 2011 Location: Colorado	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.

16th November 2011, 05:15 PM	#2
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	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. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

16th November 2011, 06:40 PM	#4
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	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. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

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16th November 2011, 05:26 PM	#3
seebert diyAudio Member Join Date: Sep 2011 Location: Colorado	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.

16th November 2011, 11:26 PM	#5
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	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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