Replacing LED's on 1.5t

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gjm76
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Replacing LED's on 1.5t

Post by gjm76 » Fri Oct 23, 2009 4:32 pm

Guys,
I want to replace my red LED's with blue ones. Two questions, Where can I find the blue ones and is it relatively easy to do? Thanks


Greg
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Re: Replacing LED's on 1.5t

Post by BillD » Fri Oct 23, 2009 5:09 pm

I used THESE when I did my M-400s
Blue Black M-400.JPG
Blue Black M-400.JPG (46.83 KiB) Viewed 1815 times
It should sound like it isn't there!
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Re: Replacing LED's on 1.5t

Post by BillD » Fri Oct 23, 2009 5:21 pm

You'll note that I got the bulbs with the least brightness I could. They are still mighty bright. Some of the clear ones could almost blind you. You don't want your amp to be too distracting. It was easy on the M-400. The circuit board was glued to the faceplate with the LEDs sticking out through holes.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer

gjm76
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Re: Replacing LED's on 1.5t

Post by gjm76 » Sat Oct 24, 2009 7:30 am

Thanks BillD, What are the LED's held in with? Are they soldereed in? I have changed bulbs in my TFM series, but never worked with LED's. Would you happen to have a link as to the actual bulbs? Thanks!


Greg
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Re: Replacing LED's on 1.5t

Post by BillD » Sat Oct 24, 2009 10:13 am

The capital THESE in my first post is a link to the Mouser site with a description of the bulbs. The blubs are just soldered in and stood off from the board the appropriate amount to reach the holes in the faceplate in an M-400.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer

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Re: Replacing LED's on 1.5t

Post by gjm76 » Sat Oct 24, 2009 10:45 am

Oh, ok, I see that now, thanks for the advice and site! I will try it...

Greg
Check out my new website for Vintage Audio Advertisements, Brochures, and Reviews! http://www.VINTAGEAUDIOARCHIVE.com

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Re: Replacing LED's on 1.5t

Post by brianjcollins » Tue Jan 12, 2010 6:31 pm

Did you ever get this done gjm76? I was thinking about doing it aswell.

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Re: Replacing LED's on 1.5t

Post by Toy Maker » Tue Jan 12, 2010 6:39 pm

Hey Bill... would it be possible, and or easy to add a small pot to the back of the amp, and be able to bring the brightness down if you wanted ??
I ask, because I am thinking of opening ALL my equipment that has LEDs, and change them ALL over to (1 color)
But I want them to also be all the same brightness, without playing around with all the resistors.

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Re: Replacing LED's on 1.5t

Post by BillD » Tue Jan 12, 2010 8:42 pm

I guess it would be an amp to amp decision. On the M-400 I didn't do anything but find LEDs that were compatible with the ones in there. But, there is a 3.3kΩ resistor on the +12V lead that I suppose could be a pot. On the M-500(t), I build a board that has a 22Ω resistor in series with the LEDs (along with a rectifier circuit to turn the 8V AC into about 11V DC), when the dimmer switch is turned to bright, it drops in another 22Ω resistor in parallel with it to yield 11Ω. I suppose you could replace the dimmer switch with a low value pot (or trimmer) that would replace the resistors and have the lamps be continuously variable.

So, yes, it's all doable, but you'd need to take a look at each circuit to determine the best approach.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer

gjm76
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Re: Replacing LED's on 1.5t

Post by gjm76 » Fri Jan 15, 2010 7:23 am

NO,
I have not done it yet, I am planning to sometime in the next couple months. I will post pics when I do, Thanks!

Greg
Check out my new website for Vintage Audio Advertisements, Brochures, and Reviews! http://www.VINTAGEAUDIOARCHIVE.com

Theater System: Carver tfm-35, tfm-25, M-500t, 490t CD, Denon 2808 DVD, Sony 550 Blu Ray, Elite Receiver, Denon Dp-62 TT, Epson HC 6100 Projo, Gateway XP PC

Bar System: Carver m1.5t, Otari mx-5050 Open Reel, Sony Turntable, HP Desktop PC

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