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Old 28th October 2010, 04:34 PM   #1
Tfan69 is offline Tfan69  Italy
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Default about 83 mercury rectifier

just a fast question about what to expect (visually) from an 83 rectifier
i found this pic googling around, now i'm building an aikido using the 83, but the blue glow is barely visible with lights off, and nothing anywhere near the below pic..
is just me that i'm expecting too much or it is right this way?
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Old 28th October 2010, 04:48 PM   #2
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Sadly, life is not as glamourous as art. Or get a better camera/ use a tripod
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Old 28th October 2010, 05:11 PM   #3
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Default Rectifier Glow

Hey Guys, take a look at the magnificent glow of the rectifiers in this monumental 1955 vintage Philips 1000 watt amp playing Bach.

YouTube - Bach Toccta D-Moll on 1000W Audio Tube Amplifier EL6471
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Old 28th October 2010, 06:40 PM   #4
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With a good camera, tubes often come out prettier in dark shots than they actually look in real life.
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Old 28th October 2010, 06:45 PM   #5
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that ROCKS!!!

./e
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Old 28th October 2010, 06:50 PM   #6
LAJ is offline LAJ  United States
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Ahh, mercury vapor rectifiers. I remember them from RCA TV transmitters. How much they glow is dependant on the current flow thru them. If they ever start turning green, its time to change them out or you will be off the air.
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Old 28th October 2010, 07:01 PM   #7
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And I remember Mercury Vapor rectifiers in AM transmitters too. You could watch the modulation in the brightness of the glow.
Just make sure the filaments are hot enough before you apply the high voltage!
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Old 28th October 2010, 08:04 PM   #8
Tfan69 is offline Tfan69  Italy
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Quote:
Originally Posted by LAJ View Post
Ahh, mercury vapor rectifiers. I remember them from RCA TV transmitters. How much they glow is dependant on the current flow thru them. If they ever start turning green, its time to change them out or you will be off the air.
yeah... didn't tought about current flow, the above video told me why i don't see the nice glow i was expecting, the tube is working at more or less 30mA, not enough to make the vapour glow

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Originally Posted by Frank Berry View Post
And I remember Mercury Vapor rectifiers in AM transmitters too. You could watch the modulation in the brightness of the glow.
Just make sure the filaments are hot enough before you apply the high voltage!
yes but.. i thought that preheating of the filaments was necessary just before turning on after long and probably side storage
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Old 28th October 2010, 08:10 PM   #9
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If the tube has been stored on it's side (even briefly), let the filament warm up for a minimum of 45 minutes before applying high voltage to the anode.
Otherwise, the arcback can be pretty dramatic and destructive.
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Old 28th October 2010, 09:34 PM   #10
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Default Danke Schoen!

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Originally Posted by 77seriesIII View Post
imfree,

that ROCKS!!!

./e
Thanks for the kind words, 77seriesIII. The video clearly and dramatically showed what would have required me to compose a lengthy text on the subject of current-modulated glow in rectifier tubes. One can't beat the visual effect of Bach's toccata on those rectifiers!
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