Anyone make a VU with a magic eye ? - diyAudio
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Old 24th July 2002, 05:15 AM   #1
Colt45 is offline Colt45  Serbia
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Default Anyone make a VU with a magic eye ?

Just curious if any of you guys have done this..

I bought a lot of tubes a while back (hasn't got here yet though)

One of them is a 6FG6. Its a magic eye, with the phospor stuff on the side instead of the end. (Also known as EM84 I think... )

Just wondering if it was common place to use eye tubes for this application? or was it not very common..

I guess I would need two of these if I wanted to put it on a stereo amp. Oh well..
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Old 25th July 2002, 12:40 AM   #2
SHiFTY is offline SHiFTY  New Zealand
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Our family used to have an old valve reel-to-reel tape recorder that got thrown out (!#$!@$) which had a magic eye level meter... It was really nice... Glowed bright green.

You could just use one of these, just connect it up to only one channel. I mean, it doesnt really need to be accurate right! Usually channels are roughly the same level anyway.
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Old 25th July 2002, 02:16 PM   #3
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Hi colt45
I haven`t done it until now but sure IŽll do it once because I love the appearance of this magic eye tubes too.
Here`s a link to a great page that shows You EVERYTHING in detail about how to build Your own VU (even accurate) with magic eyes tubes:
http://www.megabaud.fi/~jtolonen/ga/...r/peakmtr.html
There are tubes for stereo application also (EMM801/803) but they are hard to find and expensive.
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Old 26th July 2002, 11:42 AM   #4
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If you want stereo, magic eye tubes are usually pretty easy to find. Just look through any comprehensive stockist of NOS tubes. I see them all the time.
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Old 3rd December 2002, 10:34 PM   #5
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I made some. Used 0.1uF cap and Ge diode in series from speaker into 1M trimmer, whose slider goes to grid of EM. It works fast, interesting...
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Old 19th October 2005, 07:01 PM   #6
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like SS circuits, you could use an RC time constant, to make a slower fall time.
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Old 19th October 2005, 08:39 PM   #7
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have a look at :

http://www.aha.nl/tubelevel.aspx
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