tubes n needles

silurato · 21st June 2005, 01:05 PM

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?

Sch3mat1c · 21st June 2005, 06:47 PM

Tubes can do way better: 6AL5 and a 6E5.

Tim

SHiFTY · 21st June 2005, 08:16 PM

Yeah I love to shoot up with ma tubes.

Oh, sorry, wrong topic.

Simpleton · 21st June 2005, 08:24 PM

Maybe this one?

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

Cheers!

SHiFTY · 21st June 2005, 09:04 PM

I built a tube leve meter using this schem

EM81

although I omitted the 350-470K and ran it off the speaker connector.

silurato · 21st June 2005, 09:39 PM

Thank you all

i'm going to build this project:

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

Magik Eyes are GORGEOUS!!!!

...but what about needles?

Sch3mat1c · 22nd June 2005, 05:03 AM

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.

Tim

21st June 2005, 01:05 PM	#1
silurato diyAudio Member Join Date: Aug 2004 Location: Verona	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? __________________ Everybody wannabe naked and famous!!! Yeeeeahh!!!

21st June 2005, 06:47 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Tubes can do way better: 6AL5 and a 6E5. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

21st June 2005, 09:39 PM	#6
silurato diyAudio Member Join Date: Aug 2004 Location: Verona	Thank you all i'm going to build this project: http://sound.westhost.com/project55.htm Magik Eyes are GORGEOUS!!!! ...but what about needles? __________________ Everybody wannabe naked and famous!!! Yeeeeahh!!!

22nd June 2005, 05:03 AM	#7
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	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. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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21st June 2005, 08:16 PM	#3
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	Yeah I love to shoot up with ma tubes. Oh, sorry, wrong topic.

21st June 2005, 08:24 PM	#4
Simpleton diyAudio Member Join Date: Jan 2005 Location: Lisboa	Maybe this one? http://www.valvediy.com/slipg1.html Cheers!

21st June 2005, 09:04 PM	#5
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	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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