Layout schemes

[Reeltarded]

The more I work out my own layouts the less sense a board makes.

The interstage mixers end up a 6" wire run from where they terminate. The grids another 4.5"...

I think I am about to give birth to a PTP amp. I wish I had a center tube chassis. i would fly the heaters and keep the signal discrete on both sides plus use a separate transformer for heaters.

If I try to keep the circuit on the board I end up crossing somehwere that I don't like. They just built them this way so they could get amps out the door..

Hiwatts are Hiartt, no? Damn. MiarrshaLl.

[Blackburn]

PTP!!!!!!!

I have a couple small blank chassis. 11"/7"/2"

Interested? I'll throw in some of the blue stuff.

Wait, I'm out. Looks like it's just the chassis.

[Reeltarded]

The board makes you have to do bad things. Once you start placing things in order the problems multiply. The PCB Express thing with the tube toilets keeps haunting me. Center socketing tubes on the chassis makes so much sense.. I don't have that kind of stuff or the means to punch it...

Thought experiments only go so far.. then my brain starts that bubbling noise.

[martin manning]

I was going to mention the tubes-in-a-hole design. I'm pretty much sold on it.

[Reeltarded]

Always the clear approach and a way around the trouble bits.

I can ham a normal schematic together really quick and not mind anything but safe work practices and get a quiet amp, but that isn't artful or cheeky smart. I want to impress someone better than me.

Smartful.

Haunted by Fowler running heaters outside too. haha!

[vibratoking]

Just remember that shorter path length does not always equal nirvana. As you condense you get more parasitics. Coupling, crosstalk, feedback paths, etc...will change. You may have to pay more attention to things like high impedance nodes and power supply routing. Also PTP does not allow you to dress wires in certain places like you might be used to doing.

[Reeltarded]

I have been thinking about that too. Thanks..

I am not sure how to know until I make a couple pieces of crap though.

[vibratoking]

I agree that it will take some experimentation to determine what creates problems and what sounds good. But you'll never get it sorted if you don't pay attention to what is happening in this regard. Gil Ayan put this together and it is a good summary of some of the issues. I don't know if you have read it.

http://www.ayanmusic.com/leaddress.htm

[Reeltarded]

Excellent! Have not. You school me well. Thanks, teach!

I know a couple things about flux and the tone stack with a couple ideas about how to use it like a birthday whore.

[xtian]

I've built three Fiddys so far (1987 circuit). Each has been slightly different in layout, each improving on some features, and marching backward on others. I have NO idea how many prototypes I'd have to make before arriving on what I'd consider a "production" model.

But I sure enjoy the process. My wife has sodoku, I have amp layout. Multidimensional puzzles are good for your brain!

[Reeltarded]

I want aluminum chassis with an elevated steel plate under the tone stack area only. I say this because of some experiments I have already done. The tone stack likes to know what is going on around it but the rest of the circuit likes to think there are no other parts. (I think)

My PC ate a main drive so I am out of drawing for a couple days. SOB!!!

Rear input if I use a normal chassis. bet ya..

I need something not wasteful to make rings out of for the socket dressing. Maybe cast from epoxy with no filler? Cutting board material would be a wasteful bummer. I guess formica is also a good and cheap option for testing.

Did Mark sell that Hiwatt thing? I need to look.

[boots]

Tube Toilets - are those the "below-grade" tube sockets? With the metal collar sticking up around the base of the tube? I think I might have some of those in my junk box. Reel, If you're interested, I can dig for them. I probably won't ever use them.

[Reeltarded]

No! If you look up the PCB expresss thread you will see that the tube dressing is all done on thru-board holes over tubes centered in the chassis.

This would be rings with turrets or eyelets elevated from the chassis with standoffs. Using board material would be a pain and a wasteful expense so I am looking at molding these parts. They might even be made from a softer material with mounting legs as part of the molded part.

Sure appreciate that offer! Thank you!

[boots]

OK! Never mind then. Sounds interesting and different. I have a lot of old "junk" that could be useful to the right person. And my wife would be tickled if I thinned out my junk box. Can't just throw it away though!

[Reeltarded]

Get a list. If there is anything I can use in there I would be happy to pay a fair price.