adding LEDs to amp head - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 3rd October 2007, 04:48 PM   #1
xbox540 is offline xbox540  United States
diyAudio Member
Join Date: Aug 2007
Default adding LEDs to amp head

hey guys, does anybody know how to add those little LED lights to an amp head? i have a peavey ultra 60 head and i want to add lights to it to make it look cool. how would you go about wiring those in?
what the hell YOU looking at?
  Reply With Quote
Old 4th October 2007, 01:56 AM   #2
diyAudio Member
Join Date: Oct 2004
Location: Adelaide South Oz
LED Stuff:

Run them from the tube heater 6.3V AC supply.

LEDS are inherently a diode so will conduct only on one half cycle.

LEDS have a forward voltage drop of around 2.0 volts (blue leds drop a little more and red leds drop a little less, green leds in the middle).

LEDS have very low reverse voltage break down so protect them with a series power diode (like a bog standard 1N4007) with the same polarity as the LED.

add series resitor to limit LED current to say 10 to 15 mA
6.3V - 2.0 volts = 4.3 V to be dropped across the resistor.
4.3V / 10mA = 430 Ohms

So for each LEd you add you want a series string:
1/ one side of heater to anode of power diode
2/ cathode of power diode to anode of LED
3/ cathode of LED to current set resistor (390 Ohms for bright, 470 or 560 or even 680 Ohms for less bright)
4/ other side of resistor to other side of heater supply.

If you are using multiple of these wire each alternative "set" to the heater wiring reversed with respect to the 1st so that it conducts on the opposite half cycle of the heater supply.

  Reply With Quote
Old 4th October 2007, 04:06 AM   #3
diyAudio Member
Join Date: Jun 2005
Location: USA
Send a message via AIM to ThSpeakerDude88
Heres a cool thing I did with my amp.

Its relatively easy to do. I used a small bridge rectifier from the 6.3vac and a current dropping resistor ( seem to recall 4.7k?) and a small BRIGHT blue led. While engraving my name with a dremel was hard to do, it is in theory simple. Carve any design midway into the plexiglass and then stick a LED at each end ( or one in my case) and it will light up the engraved part. I think Hughs and keffner use the same type of thing for their amps.
always preach the gospel-
and when necessary use words.
  Reply With Quote
Old 4th October 2007, 06:56 AM   #4
xbox540 is offline xbox540  United States
diyAudio Member
Join Date: Aug 2007
all right guys thanks for the info ill give it a try, and if i succeed this will be one cool project.....
what the hell YOU looking at?
  Reply With Quote
Old 4th October 2007, 11:13 AM   #5
diyAudio Member
soundbrigade's Avatar
Join Date: Feb 2006
Location: Vaenersborg, Sweden
Send a message via MSN to soundbrigade
Blue LEDs are best (in my eyes), but here I have enhanced my 50CA10 with yellow LEDs:

Click the image to open in full size.

And this is next project - red LEDs to enlighten a pair of 829:

Click the image to open in full size.

Here I use a massive 10mm led.
I have found out that blue LEDS helps the elctrons move smother from cathode to anode thereby enhancing the sound a lot - firmer bass, crispier treble and much more transparent midrange. My 50CA10 sounds a bit murky due to the yellow light, but I can accept that, just for the look....

And a pair of GU50 with blue LEDs:

Click the image to open in full size.
Due to economical cutbacks, the light at the end of the tunnel has to be switched off.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
adding reverb to a PA head m6tt Instruments and Amps 9 29th December 2007 04:09 AM
motor types head to head for a TT p_ete2003 Analogue Source 20 11th January 2007 08:29 PM
Trade my blue LEDs for White LEDs CaliforniaBob Swap Meet 7 26th March 2004 07:28 AM
WTT: Blue LEDs for Red & Red/Green LEDs CaliforniaBob Swap Meet 2 9th June 2003 02:58 PM

New To Site? Need Help?

All times are GMT. The time now is 02:42 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2