Dumble power supply board material

[Dugmore]

Hey guys, does anybody know what that green material is that Dumble sometimes used for his power supply boards? Says MAFR on it.

Thanks!

[Structo]

Got a picture?

[M Fowler]

Sure

[Dugmore]

Yeah, that right there.

Thanks, M Fowler.

[Structo]

Hehehehe, I thought you were asking what the circuit board was made from.

That there is the blue RTV silicone goop.

[Dugmore]

Hehehehe, I thought you were asking what the circuit board was made from.

That there is the blue RTV silicone goop.

I am. I know the preamp board is Formica, I read up on it on this site. I'm wondering what the green power supply board material is.

I realize it's probably not significant from a sonic standpoint, but I'm researching stuff for a build I'm planing. It's going to be a copy of a Dumble I used to have, and I'd like to make it an exact clone.

This is going to be just for myself, not for commercial purposes, so I don't care if it's obsolete or hard to get stuff. I'm patient.

Any help would be appreciated.


Thanks!

[Structo]

Well it is of course a copper clad laminate but finding that same MAFR board may prove futile.

If you can find some copper clad Garolite FR4 board that may look similar.

I think the FR part means fire rated.

You do know that the precision power supply board is a printed circuit board right?

http://www.ebay.com/itm/Grade-G-10-FR4- ... _522wt_825

[Dugmore]

You do know that the precision power supply board is a printed circuit board right?

Yes. I looked at it carefully when I still had the amp. It didn't look exactly "printed", more like home made, but it did have traces on the underside.

Thanks again.

[Structo]

Yes Alexander made them.

[Structo]

This mask is for the precision power supply board.

[Dugmore]

Thanks, I appreciate that. On the Dumble I had those traces were not exposed copper btw, they were completely coated in solder. I wonder if Dumble did that to make the traces thicker?

[Structo]

Yes the old printed circuit board designs were often drawn by hand.

I think the tinning of the traces was to increase capacity and also protect the copper from corrosion.

Kind of a poor man's wave soldering.

[husky]

Don't you love the way he made the chassis out of Extruded channel ?

[da Geezer]

I'm researching stuff for a build I'm planing. It's going to be a copy of a Dumble I used to have, and I'd like to make it an exact clone.

This is going to be just for myself, not for commercial purposes, so I don't care if it's obsolete or hard to get stuff. I'm patient.

Any help would be appreciated.


Thanks!

Hello Dugmore.....welcome!

What was the serial # of the amp you owned? Do you have pictures or a schematic drawn out with component values you would be willing to share?

We love that kinda stuff around here!

TIA

Geezer