Any obvious problems with this preamp layout?

[Ken Moon]

I've come up with this preamp layout, and wanted to know what you guys think (the front of the amp is at the bottom of the sketch).

The arrows going to/from V1 go to the tone stack pots, which aren't shown (the tone caps and slope resistor will also be mounted on the pots).

The thing I like most is having the caps across the back, which leaves several options for filter cap types.

I didn't post the schematic, but you can see what amp it is in the filename, when you click on the thumbnail

[IMG749]http://i514.photobucket.com/albums/t346 ... layout.jpg[/img]

[M Fowler]

https://tubeamparchive.com/viewtopic.ph ... c&start=15

It looks right. I see your using a 22k tail resistor instead of the 10k.

[Ken Moon]

Cool!

Yeah, that 22k is just a placeholder value for now - I'll be using a completely different psu and power amp (similar to the Talon amp), so I'll have to tune the PI when I get it all together

[Normster]

I was thinking of something very similar. Haven't built it yet, but here's a Hoffman-style layout I was working on a couple years ago. Obviously inspired by Dynaman.

FWIW, I just finished an Avenger-type amp with preamp tubes up front and it's very quiet and stable.

[Ken Moon]

Thanks for posting that, Normster!

That sure looks a lot like the layout I came up with - as they say, there's nothing new under the sun

[M Fowler]

Nice layout Normster.

I did my board this way.

[dynaman]

Wow, the layout looks sweet. I'm more accustomed to seeing your first pic. Just me at the table with some graph paper, a ruler and a .5 Pentel. I usually just draw the board and a drilling template for the chassis. I prefer to leave to leave the wiring to fate.....

Good luck!

[Normster]

I started doing the Visio thing after my first few amp disasters. Over time, I added a bunch of components, mostly drawn to scale, to help me visualize where everything needed to go. Now I've gotten to the point where I can translate from schematic to layout pretty accurately, but I'm still slow at it. (I spend more time laying out an amp in Visio than I do actually building it.)

As for the wiring, I only do that to make sure I've accounted for all connections. I rarely follow the wiring on my layouts and often make changes on the fly. That's part of the reason that I stopped posting layouts for awhile. Too many first-time builders were following my layouts "exactly" and then wondering why they didn't work.

[M Fowler]

Normster your layouts have been great and yes I use them as guidelines for projects.

People still need to know what is going on in a circuit and having a schematic really helps understanding that.

Thanks for all your hard work, my layouts suck!


Mark

[Ian444]

+1 Normster, your layouts are top quality, much appreciated, and I haven't even built a thing from one of them. But I know a classy act when I see one.