Tips on box layout (tube, power supply too)? Sorry, again.

[JimRayden]

Sorry to spend another thread on it but I want to make sure I understand everything before I start drilling the expensive box.

Situation: a GGG Tube Driver, a large -->plastic<-- box, an integrated power supply.

I already know that I must keep the AC wires away from the circuit (and the tube?). But what else? What to concider with the tube and the circuit placement, what influences what, etc...

Also, if everything else would be perfect, could the plastic box result in huge amounts of hum by not shielding? If it could, can it be fixed by stuffing the circuit into a small aluminium box (by leaving out the tube and the power supply) and all that into the larger plastic box?

And please don't tell me to "get a big aluminium box instead", I've got that alot. I want to use the plastic box I have and that's it. I need the best solutions on how to use it.

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Jimbo

[smashinator]

I'd say try it without and see.  You can always line the box with copper tape or that magnetic paint if you need to.

[JimRayden]

That's the problem. I can't use those! It's a transparent dark red box. Looks really classy. I want the tube and some other stuff to be seen. Then I'll throw in a small filament bulb (for retro mojo) to illuminate it all and then show off at gigs.

Well yea, I've already got the red box and it was pretty expensive.

Anyway, any ideas on hum reducing in a plastic box?

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Jimbo

[R.G.]

Read GEO. It usually answers not only this question but the next few you have.

In this case, there is an article  on de-humming plastic boxes.

[puretube]

for me, glass & plastic don`t go together well...

[JimRayden]

I'll see GEO

puretube: You mean glass as the tube?


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Jimbo

[JimRayden]

Well I read GEO and it only talks about shielding the box by tape and other stuff. I don't want to ruin the transparency with the foil thing.

I believe there is no place in internet that can't answer that question. So it'd be pretty helpful if I started recieving some help instead of links (not being rude in any way).

Well, if the outside shielding compulsory, I could stick the electronics into a small shield box and put it into the plastic box with tube and the power supply...

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Jimbo

[H.Manback]

I don't know if this will work, but isn't it true that you could make a shielding by using something similar to chicken wire? My knowledge of shielding isn't great, but I believe that to make a Faraday's cage you don't necessarily need a solid conductor. Holes are possible, and in that light you could make something less 'in your face' to do shielding.

I looked it up now on wikipedia, and there it says in practice you can do this for shielding, but it is less effective.
http://en.wikipedia.org/wiki/Faraday_cage

[JimRayden]

The Faraday cage seems to be pretty effective according to this: http://webphysics.davidson.edu/Applets/Poisson/Faraday.html

Grat idea, Manback! I think a dense chicken cage would be enough. Some chicken wire should add some coolness, too.

I think I'll mod the gain knob to not allow that amout of gain also since in my previous tube build, the second half of the turn was all the same really heavy distortion and just added more and more hum. I think it'd help alot.

Also, what would be the result of removing one SS gain stage? what range of sound would I get then?

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Jimbo

[JimRayden]

up  :roll:


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Jimbo

[JimRayden]

Aaaaaand... up.  


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Jimbo

[JimRayden]

If anyone missed the question I'm upping this for:
what would be the result of removing one SS gain stage? what range of sound would I get then?


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Jimbo

[JimRayden]

Honestly, I'm not trying to raise my post count.   I'll let it be after this one.


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Jimbo