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Old 21st June 2005, 01:05 PM   #1
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Default tubes n needles

Hi everyone.

i'm going to mount a needle- level meter on my HBW amp, monitoring signal on line stage input. Driver is simple, a buffer/opamp rectifier drive a peak-envelope filter.

So i wonder... how it can be done with tubes? i know it gotta be difficult, and expensive, definitely not convenient; but i'm really curious: does anyone have some vintage schematics?
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Old 21st June 2005, 06:47 PM   #2
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Tubes can do way better: 6AL5 and a 6E5.

Tim
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Old 21st June 2005, 08:16 PM   #3
SHiFTY is offline SHiFTY  New Zealand
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Yeah I love to shoot up with ma tubes.

Oh, sorry, wrong topic.
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Old 21st June 2005, 08:24 PM   #4
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Maybe this one?

http://www.valvediy.com/slipg1.html

Cheers!
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Old 21st June 2005, 09:04 PM   #5
SHiFTY is offline SHiFTY  New Zealand
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I built a tube leve meter using this schem

EM81

although I omitted the 350-470K and ran it off the speaker connector.
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Old 21st June 2005, 09:39 PM   #6
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Thank you all

i'm going to build this project:

http://sound.westhost.com/project55.htm

Magik Eyes are GORGEOUS!!!!

...but what about needles?
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Old 22nd June 2005, 05:03 AM   #7
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If you want to use a meter with tubes, use 6AL5s for signal rectifying diodes (or 1N4148 if you don't care) and do it passively, or add, at worst, a preamp/driver stage consisting of a gain stage with cathode follower hanging off it. Or you can put the diode(s) before an amplifier, though you have to pay more attention to DC stability. You might want to read up on VTVM (Vacuum Tube VoltMeter) schematics, too.

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