sssmokin99
Well-Known Member
Thanks, EW! I'm going to check these out. Im sure the color issue has improved, based on your description....
Marantz Led light replacement project.
- Thread starter HomerJSimpson
- Start date
Rasputin47
Woad
Last edited:
For Marantz units (and others that use fuse-lamps), I've simply bought pre-made assemblies from eBay seller whsh94a. Much easier than dinking around & making them myself.
Mico
Well-Known Member
Blue or green...
I have 2238B (silver face) with quite high mileage and much "younger" 2215B and 2250 (dark tuner display) - all with original incandescent bulbs. 2238B is more or less the same blue as it was 30 years ago when I bough it, maybe a tad darker. On the other hand, 2215B and 2250 are both greenish, not turquoise blue but almost green even after velum replacement. Might be going LED soon mainly to reduce heat build up but this greenish display tendency of older Marantz receivers (as opposed to later silver faced ones) remains a mystery to me. Maybe tuner dial plexiglass looses its color properties faster (heat,age) than on silver faced models but when I look at them against the white background (removed from the unit of course
they both look blue - figure that one out?
BTW, I have never seen "green" lights on any silver face Marantz...
I have 2238B (silver face) with quite high mileage and much "younger" 2215B and 2250 (dark tuner display) - all with original incandescent bulbs. 2238B is more or less the same blue as it was 30 years ago when I bough it, maybe a tad darker. On the other hand, 2215B and 2250 are both greenish, not turquoise blue but almost green even after velum replacement. Might be going LED soon mainly to reduce heat build up but this greenish display tendency of older Marantz receivers (as opposed to later silver faced ones) remains a mystery to me. Maybe tuner dial plexiglass looses its color properties faster (heat,age) than on silver faced models but when I look at them against the white background (removed from the unit of course
they both look blue - figure that one out?BTW, I have never seen "green" lights on any silver face Marantz...
sx-70
Well-Known Member
Just converted the 2285b to LED's. It does look a little purplish. Why is that? The lamps were 2 diode instead of 3. There is a seller in Portland that states the 3 diode lamps (rather than 2 diode) produce a light closer to the original blue. Does that really make a difference?
Warm white (left) vs Bright white (right) LEDs. The warm white gives you beautiful blue, the bright white gives you an almost purple color.
turnitup
No, the stereo won’t break the crystal...Oh CRAP!
I've used the Portlland ePay source for three of my marantz units with great success. The bulbs are so cheap now, I can't see every replacing any of my units with incandescent bulbs again. It is a little bit different look, but I like how they display with the LEDs.
Has anyone tried CCR constant current regulators from ON Semiconductor? Like https://www.onsemi.com/pub/Collateral/NSI45020-D.PDF 20mA current regulators for selector bulbs. Yo u need to rectify AC voltage and add CCR in series with LED.
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PE9ZZ
Super Member
Too expensive. And you don't need current regulator. What I do (and haven't seen anyone do) is make oblong PC boards that fit between the caps of blown fuses to create the fuse style lamps. On the boards I have two strings of two 0603 LEDs and one resistor which are mounted anti-parallel. This means they can handle more current because they are on only like 30% of the time. Because they light up alternating as they are powered by AC voltage the flickering cancels out nicely. Only snag is that producing these devices is more expensive than ordering them...
Tjerk, 9ZZ
Tjerk, 9ZZ
LED's in general like to have controlled current which this CCR will do . Resistor is the cheaper than CCR but CCR will control LED current regardless the voltage change across LED. this is advantage if voltage is fluctuating . I have ordered 20mA so it should be good enough for selector bulbs ..
PE9ZZ
Super Member
These devices are 20 eurocents if you buy 100. From Pharnell. AND you must supply DC. I bought 3000 resistors for €16. But if it rocks your boat go for it. These are fine devices. Having said that, LEDs don't care how they are fed as long as you don't exceed their (current) limits. Marantz has 20 Vpp AC (that is: 10 V peak) supply voltage for their dial lamps. A resistor will limit that juuuuuuust fine.
Tjerk, 9ZZ
Tjerk, 9ZZ
I have designed my own pc boards and they have a full wave bridge and cap on the back for zero flicker. Two medium power large warm white LEDs on the front and holes for an eighth watt through hole resistor for current limiting. I recycle old fuse lamps, harvesting the end caps for re-use. I like being able to set the brightness and often go over the standard brightness on silver faced models like the 2330B, 2500, etc. as those are so dang dark!
@Traverse: For that reason I wouldn't use this device as you're stuck with a set current. Interesting device though and thanks for posting it!
^^^ Oh yeah... the vellum does that very well! Quite a few folks use other materials these days like mylar drafting sheets, baking parchment and such. I like Canson Opalux art grade acid free paper as it will not yellow. I've seen a unit after 9 years and it's still like new looking.
Maybe you can add external ambient light sensor to set LED light based on conditions
