1847
1764 posts
May 06, 2014
8:32 PM
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so i am changing a tube in my amp
i put the tube in, i am using a flashlight
i shine the light on the tube
and it starts to feedback!
turn the light off.... the feedback stops.
i'll have to film this, pretty wild..... well i dont get out much lol
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i get a lot of request when i play my harmonica
"but i play it anyway"
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Jehosaphat
738 posts
May 06, 2014
9:32 PM
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I think that maybe that old german guy explained this.The Tube is interacting with the Photons and warping the space/time continuum to create energy..
Be careful you could disappear into another dimension.
Seriously though i love to know what's happening here
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1847
1767 posts
May 06, 2014
9:43 PM
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the flashlight was a high intensity 500 lumen lcd?
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i get a lot of request when i play my harmonica
"but i play it anyway"
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SuperBee
1957 posts
May 06, 2014
9:52 PM
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Photo-sensitive tubes used to be used in movie projectors to amplify the soundtrack. But I never heard of what you describe.
My dad was a TV repairman back in the day of tube TV. When I was a little tacker...age 4....I began travelling with him to home callouts. I was the illumination technician...I shone light on many tubes but I don't recall ever hearing light-induced feedback...plenty of lack-of-light-in-the-right-place induced swearing though
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Jehosaphat
739 posts
May 06, 2014
10:49 PM
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@bee
You were a little Tacker?That's what my Dad used call us kids..your Dad was from Cornish,Devon stock?
How's that L/W reverb working out for you?
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SuperBee
1958 posts
May 07, 2014
12:23 AM
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??. No Rick, my great great was from Wakefield, Yorks.
But who knows where the words get picked up from once you're out in the far flung colonies...my family has first settler roots. Too hard to trace.
The reverb...I really haven't used it much at all. All my gigs have been with the DeVille or my Ashton Viper, and both have pretty good on board springs. So I just use my delay and sometimes the octave.
I just picked up a hotrod deluxe that may see some action, but again it's already reverb equipped.
I'm sure it will come in handy yet...maybe if I take up playing through PA. I thought I'd use it with my Princeton reverb, which has springs which I don't care for...but that amp has been out of action for a while. Hopeful to get it back this week. And it should be a bit louder and more giggable...so maybe I'll get it into action then.
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J_Bark
5 posts
May 07, 2014
4:05 AM
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I that is caused by the "photoelectric effect" (first identified by Hallwachs BTW) I would suspect. Basically electrons are displaced from certains metals when photons of light(typically UV for metals like copper or zinc) impact the metal surface.
The real question though is: does shining a light on your tubes generate the right tone for your harp???
Inquiring minds want to know.
Cheers
Jerry
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Silvertone
155 posts
May 07, 2014
4:56 AM
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Is there an optical tremolo/vibrato circuit in this amp?
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DukeBerryman
368 posts
May 07, 2014
6:53 AM
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This explains why blues harp is not possible without quantum mechanics. Thank your local physicist at your next blues jam.
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