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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 10 Dec 2010, 15:33 
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Joined: 05 Oct 2009, 21:43
Posts: 13
Hello,

Does anyone have a design for a VU meter for use with a vacuum Tube Amplifier? I received a couple of the old analog VU meters and would like to incorporate them into my new tube amp kit.

Thanks,
Jim


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PostPosted: 10 Dec 2010, 20:08 
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Joined: 14 Feb 2010, 13:13
Posts: 665
Location: Lisbon, Portugal
Hi!

Where would you like to place them?
On the amplifier´s output or in the line in?

I´m running this circuit and it works like a charm: http://www.jlmaudio.com/AT51%20DIY%20VU.pdf

Cheers,
Miguel


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PostPosted: 10 Dec 2010, 23:28 
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Joined: 05 Jan 2010, 21:16
Posts: 680
Location: Las Vegas Nevada USA
Interesting article. I didn't know the old meters had internal rectifiers. I know about the 0.3 second response which results in an intergration of the signal and an average reading rather than a peak reading, but I also didn't know the overshoot could only be 1.5%. That's a tight spec.

I've got several old cheap DC type VU meters I was going to fool around with one day, but when I do this article will save me a lot of time.

Thanks for the link.

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PostPosted: 11 Dec 2010, 04:00 
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Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
For a tube amp, you need a tube VU-meter:
http://m.bareille.free.fr/vu-in13/vumeter_in13.htm

Image

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“If you don't know where you are going, any road will get you there.”
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PostPosted: 11 Dec 2010, 09:14 
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Joined: 14 Feb 2010, 13:13
Posts: 665
Location: Lisbon, Portugal
This is very beautiful!

I didn´t about about their existence!

Though it does not go well with my amplifier design (maybe next one).

Thanks for sharing Magnus!



Cheers,

Miguel


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PostPosted: 11 Dec 2010, 11:34 
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Joined: 05 Jan 2010, 21:16
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Location: Las Vegas Nevada USA
Soundbrigade wrote:
For a tube amp, you need a tube VU-meter:
http://m.bareille.free.fr/vu-in13/vumeter_in13.htm

Image

I thought I'd seen it all, but obviously not. That's cool looking. I'd love to see it in action.

What is that tube called?

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PostPosted: 13 Dec 2010, 13:35 
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Joined: 02 Mar 2009, 12:41
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Location: Vänersborg, Sweden
There are vids on the website, so you can see the tube performing - it is sooooo FAST!!!!

The PCB and tubes can be bought from this guy in France. The tube is Russian and is marked IN13, but the type IN9 can be used (higher current?).
You alse need the THAT2252 chip to make the RMS/DC-conversion.

I have two units that propably will work in stereo in my Priboi whenever I get my @ss out of the rocking chair and to the major rebuild.

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“If you don't know where you are going, any road will get you there.”
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PostPosted: 13 Dec 2010, 13:53 
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Joined: 24 Feb 2009, 03:24
Posts: 562
Location: USA
Sorry for off....Magnus, with output tr. from Your Priboj, You can make SE 845 or, GM70!! :mrgreen: :idea:
They are for low Ri tube and for Hi Voltage! :idea:

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Hi End is back proportional to the number of composite parts!
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, PP 6005 Gen. Ellectric , headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L& E80CC Siemens&Tel-n.
http://azazello-sound.blogspot.com/


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