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Any info about this? (neon amp powered)

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4/27/2006 12:39 PM
anonymous	Any info about this? (neon amp powered) http://img20.imageshack.us/img20/4558/neonpower49ad.jpg Is this possible?

4/27/2006 12:55 PM
John Culp	Looks silly to me. The footnote says "V1-V2 Any 40W Neon Tube," while the schematic shows V1 & V2 as triodes labeled 12AU7, presumably the two halves of a 12AU7 that most would label as V1a and V1b. Certainly a neon tube, 40W or otherwise, won't substitute for a 12AU7.

4/27/2006 2:27 PM

quote:
"The footnote says "V1-V2 Any 40W Neon Tube," while the schematic shows V1 & V2 as triodes labeled 12AU7, presumably the two halves of a 12AU7 that most would label as V1a and V1b. Certainly a neon tube, 40W or otherwise, won't substitute for a 12AU7."

The neon tubes are over where the output tubes would normally be. Whoever drew the schematic foolishly labeled them V1 and V2 even though the two triodes of the 12AU7 are also labeled V1 and V2 -- IOW, there are two V1s and two V2s.

Shea

4/27/2006 4:14 PM
John Culp	Oh, I see. Well, maybe it would. A magnetic field can certainly inflence a plasma carrying current. I don't know what it'd do in that particular case. I read Lee DeForest's book "Father of Radio" years ago, and one of the things he experimented with before accidentally discovering the triode "Audion" was a "flame detector," with two grids in a flame. It worked, too.

4/27/2006 7:01 PM
John Culp	On further reflection, I don't think it could work. I posted the link over on the Tube Collectors Association list, and nobody there thinks it could work, either. Someone suggested it was posted as an April Fool's joke, and that seems plausible.

4/28/2006 6:17 PM

you would have to have a lot of faith that 1900 turns is precisely what it takes to convert *ANY* neon tube from a voltage regulating diode to a field-effect triode . . .

apparently you buy T1, the silicon diodes, the neon tubes and the 0.9mm magnet wire.

Everything else you probably already have

Then you wrap the 1900 turns around each tube your dang self. If the schematic is truly representative of the winding direction, this looks like two tubes identically wound by a right-handed person, and wired totem-pole.

plus I have to assume it looks like V1a & V1b are actually the ones incorrectly labeled as V1 & V2

hmm, that would then make V3 really be V2. Of course V4 & V5 are then probably really V3b & V3a respectively. But who's keeping track, it would be tough to do

I'm sure everybody's got a 6110 (EC90) in their collection anyway

Oh well, just have to give up on that project completely.

I've got an idea, why not just call the hand-wound triodes NE1 & NE2 like they would be if all they did was light up

You've got to wonder if they do light up when you play. If nobody has any experience positive or negative about glowing, I would expcet nobody has really built the unit.

Mike

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