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Ooh! Vacuum Tubes Lit With Tri-Colored LEDs

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Max The Magnificent
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Re: Beautiful bottles
Max The Magnificent   1/22/2014 1:35:37 PM
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@TonyTib: The sound was great, and tubes had a beautiful glow.  I could check to see if it's still working....

By some strange quirk of fate I was just talking to my chum Ivan here in the office saying that I need a mono amplifier to go in the Inamorata Prognostication Engine portion of the Prognostication Engine combo.

I'm planning on adding sound effects, so when you click a switch, for example, it might sound like there's clockwork machinery inside, and things rolling around and stuff happening.

I've got an Adafruit Wave Shield Kit on order -- I'm going to use it to drive an amplifier -- and use the amplifier to drive a nice 12" speaker -- I don't need huge volume, but I do want rich "rotund" sound.

A vacuum tube amplifier would so fit in with the overall theme is all I'm sayin' (LOL)

TonyTib
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Re: Beautiful bottles
TonyTib   1/22/2014 12:30:35 PM
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My brother has a 1950's Heathkit mono tube amplifier with custom speakers (we got it from free from the builder, and my brother inherited it after college).


The sound was great, and tubes had a beautiful glow.  I could check to see if it's still working....

Max The Magnificent
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Re: Light guides
Max The Magnificent   1/22/2014 12:03:05 PM
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@uwezi: I still believe that glueing the LEDs should give you a better coupling of the light into the tubes as well. If you direct the light beam from an external LED through air at an obligue angle towards the tube, much of the light will be scattered off because of reflection at the glass/air interface.

Another idea is to etch a band around the bottom of the tube and then put a ring of NeoPixels around -- I'm thinking the etch will get the light into the glass more effectively -- but I'm experimenting with some small, cheap old tubes first to see...

uwezi
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Re: Light guides
uwezi   1/22/2014 11:58:54 AM
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The glass on the light bulb is frosted on the inside... I still believe that glueing the LEDs should give you a better coupling of the light into the tubes as well. If you direct the light beam from an external LED through air at an obligue angle towards the tube, much of the light will be scattered off because of reflection at the glass/air interface. Glueing the LED to the glass effectively extends the clear LED casing to the inside wall of the glass tube and takes out two inhomogeneous interfaces: LED/air and air/glass.

Max The Magnificent
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Re: Light guides
Max The Magnificent   1/22/2014 11:22:29 AM
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@uwezi: When you glue the LEDs to the glass using transparent epoxy glue you will be able to create a light guide with matching index of refraction from the LED to the glass. This way you can get the light into the bulb without it reflecting off at the glass surface.

Thsi looks great, but as you say it's frosted glass -- my problem is that my tubes are clear glass ... I'm still working on this...

Max The Magnificent
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Re: Beautiful bottles
Max The Magnificent   1/22/2014 11:20:42 AM
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@Jean-Luc: I still have a radio receiver + tape + vinyl player from 1958 with tubes running nicely...

I'm always keeping my eyes open for a nice wooden-cased vacuum-tube based radio receiver -- I remember how "rotund" the sound was when I was young ... there's something about a 12" speaker :-)

Max The Magnificent
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Re: Beautiful bottles
Max The Magnificent   1/22/2014 11:18:36 AM
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@n4nlm: perchance is that beautiful bottle in the shipping frame an RK-65 ??

The marking on the side says: "Type 450 TH-VT 108"

Max The Magnificent
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Re: Suggestions:
Max The Magnificent   1/22/2014 9:11:36 AM
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@Bodger: That one tube with the yellowish glass bits (looks like a WL327) is actually uranium glass (used to get the right coefficient of expansion to match the lead-in wires at high temperatures).  That glass will fluoresce a beautiful yellow-green when illuminated with UV light.  For that one, I'd include at least one UV LED. Here's a pic of mine, illuminated by UV: www.vitriol.com/images/tech/tubes/WL327.jpg

Ooooh -- that is so tasty!!! I didn't even know they made UV LEDs -- now I'll have to get one and try it out on my tube with the yellowish glass bits!!!

Max The Magnificent
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Re: Suggestions:
Max The Magnificent   1/22/2014 9:08:40 AM
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@David: Maybe lasers scanning over the tube structures...

I'm reluctant to use lasers -- I can imagine them reflecting off something inside the tube and hitting someone in the eye -- the tri-colored LEDS are so much easier to use.

Max The Magnificent
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Re: Tasty Tubes
Max The Magnificent   1/22/2014 9:06:08 AM
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@David: Did you take a pic of the $275 one - I'd be interested to see what kind of tube they can reasonably charge that much for in this day and age....??


I didn't think to take a pic (I was still picking myself up off the floor) -- but if I manage to get back down again before they close the doors forever (at the end of this month) -- and if the tube is still there -- I'll take a pic for you. It really is a good one -- but I have to say that I am sooooo happy with the tubes I did get -- these are going to look INCREDIBLE on top of my Ultra-Macho Prognostication Engine

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