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Author Topic: Indicator light blown?  (Read 9773 times)
citizen
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« on: February 23, 2011, 11:05:44 PM »
Hi All

Just turned on my Bluesmaster OTS and noticed that the indicator light seems to have blown- amp working fine otherwise. I'm no builder but reckon I could have a stab at fixing this if it's just a matter of replacing the bulb? I'm aware of the dangerous high voltages in tube amps of course - can the caps be drained in this amp by switching the main power switch off and leaving the stand by on? Not sure if there are any hot spots near the lamp but I'll be careful and if necessary ask a builder friend to help. The layout seems to indicate 6.3v to the lamp- does anyone know where I'd get a replacement? I live in Ireland so any UK / Europe supplier would be great...

Thanks

Kieran
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Thilo278
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« Reply #1 on: February 23, 2011, 11:49:57 PM »
I had the same problem. Just open the amp, get the broken bulb out of there, take it to any shop who sells electronic parts (they should have those kinds of bulbs, theyre pretty standard) and solder the new one to the spot where the old one was Smiley

(Note: I have nearly no idea of electronics, amps, etc., but it worked for me this way  Grin )
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bluesfendermanblues
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« Reply #2 on: February 24, 2011, 12:19:19 AM »
I had the same problem and 'converted' my lamp from blub to LED instead.
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citizen
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« Reply #3 on: February 24, 2011, 01:10:57 AM »
LED sounds like a good long term solution- was the conversion hard to do?
« Last Edit: February 24, 2011, 01:12:40 AM by citizen » Logged
bluesfendermanblues
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« Reply #4 on: February 24, 2011, 06:38:58 AM »
No 5-10minutes tops
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citizen
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« Reply #5 on: February 24, 2011, 07:42:45 AM »
Whats the part number/type of LED etc. Like I said, I'm not a builder but if I know I've got the correct part I'll have a go. Care to elaborate on the conversion?

Cheers

K
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bluesfendermanblues
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« Reply #6 on: February 24, 2011, 12:26:53 PM »
5mm (ordinary) LED - in your favorite colour.

http://www.conrad.de/ce/ProductDetail.html?hk=WW4&insert=V0&WT.mc_id=Froogle2&productcode=156239&utm_source=google&utm_medium=deeplink&utm_content=dl_article&utm_campaign=g_shopping
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MajorDude
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« Reply #7 on: March 23, 2011, 11:13:06 PM »
Hi the 5mm LED sounds like a great idea as my indicator bulb has blown a few times

The LED's i've seen online though are only approx 2volts not 6volts like the bulbs, will this do any damage?
« Last Edit: March 25, 2011, 09:27:59 AM by MajorDude » Logged
bluesfendermanblues
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« Reply #8 on: March 24, 2011, 02:35:03 AM »
Quote from: MajorDude on March 23, 2011, 11:13:06 PM
Hi the 5mm LED sounds like a great idea as my indicator bilb has blown a few times

The LED'd i've seen online though are only approx 2volts not 6volts like the bulbs, will this do any damage?

just add a 470R resistor and a 1n4007 diode and you'll be fine.
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citizen
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« Reply #9 on: March 24, 2011, 11:58:38 PM »
Sorry but for a complete novice (me) how are the 3 components connected together to get the LED operating properly?
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bluesfendermanblues
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« Reply #10 on: March 25, 2011, 06:34:17 AM »
Quote from: citizen on March 24, 2011, 11:58:38 PM
Sorry but for a complete novice (me) how are the 3 components connected together to get the LED operating properly?

No problem, check the bottom of the schematic in this link:

http://ampgarage.com/forum/download.php?id=14563
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citizen
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« Reply #11 on: March 29, 2011, 11:49:11 PM »
Thanks- my schematic reading abilities are not great- contacted Nik & he said have a look at the c-lator layout but I couldn't make sense of that either  Huh?- I guess I'd need a photo of how to hook the 3 components together...Nik's sending me a replacement lamp so all's well
 Smiley
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SoundPerf
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« Reply #12 on: March 30, 2011, 01:00:06 AM »
Quote from: citizen on March 29, 2011, 11:49:11 PM
Thanks- my schematic reading abilities are not great- contacted Nik & he said have a look at the c-lator layout but I couldn't make sense of that either  Huh?- I guess I'd need a photo of how to hook the 3 components together...Nik's sending me a replacement lamp so all's well
 Smiley
From the schematic, the resistor is connected in series with the anode of the diode to anode of LED. The anode of diode is the side without the stripe, and usually the long lead of the LED.
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Chris

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citizen
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« Reply #13 on: March 30, 2011, 06:47:39 AM »
Now that I can understand - thank you kindly fella Wink
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