using a magic eye as an audio amplifier

[birt]

i was wondering if it would be possible to use a magic eye tube (like an EM84 for example) as triode gain stage in a guitar amplifier. It is a double triode after all. and would it light up with the amplitude of the signal?
i can't find the characteristics of the triode, probably because nobody really needs them :p

[jjasilli]

http://www.mif.pg.gda.pl/cgi-bin/vs4.pl

looks like you might have to plot your own curves.

[HotBluePlates]

You'll want to solicit TubeGeek's help.

He built a project amp that uses a magic eye tube, with input from this forum several years ago.

[PRR]

Yeah, but please don't. Magic-eyes wear out. They aren't making new ones. The radio restorers need them for future restorations.

No, it won't "wiggle" unless badly biased for audio amplification.

[kagliostro]

Look to this



(klick on it)

Kagliostro

p.s.: also if I agree with PRR, the use of one tube in an amp, as level indicator, I think is admissible  

[birt]

Yeah, but please don't. Magic-eyes wear out. They aren't making new ones. The radio restorers need them for future restorations.

No, it won't "wiggle" unless badly biased for audio amplification.

good point.

[kagliostro]

An unusual use of a V.F.D. (Vacuum Fluorescent Display)

VFD's have been used in place of valves/vacuum tubes in order to simulate low-mu triodes

I didn't imagine that this can be done

http://www.eham.net/articles/20809

this radio uses V.F.D. instead of normal triodes also for AF section output





K

[tubeswell]

... TubeGeek's ...

http://www.glacieramps.com/Glacier_Amplification/ ...

Nice website James!

[eleventeen]

From the website Kagliostro linked:   



Monster single ended amplifier with room to try 50 different preamp types?

[tubeswell]

From the website Kagliostro linked:   



Monster single ended amplifier with room to try 50 different preamp types?

Or Party Hat

[Willabe]

Or Party Hat

I'm gonna ask Santa to bring me one for Christmas.


                    Brad     

[HotBluePlates]

50 miniature tubes bowing to the King tube?

[eleventeen]

Those little tubes are all JAN Western Electrics, too. They'd probably be worth a fortune today...even if they were monodes.

[jeff]

What's a monode? A light bulb?

[eleventeen]

I guess it'd have to be, LOL. I just made it up.

[Ritchie200]

I could mount that array in my HVAC ductwork - it looks like about 50,000 BTU!

Jim

[tubeswell]

Whatever it is, its from the days when they based the design of widgets around the shape of tubes. All that glass does look pretty.