lead dress around PI

[arjepsen]

Hey.
My school just threw an old non-working solid state amp at me, and I thought it would be a great project to rebuild a tube amp in it.
Right now I'm trying to make a layout for a princeton reverb in it. I already built a princeton some time ago, but the layout was too cramped, so now I want to gut that one, and use the parts.
Aaaand of course I have to go and spoil a completely good layout, and try do do my own version instead :-)
Here's a pdf of what I've planned out so far. (You can't really see it, but there's a height dimention to have in mind also)
https://www.dropbox.com/s/62lwdrgazmytzw3/Princeton%20layout%20-%20work%20in%20progress.pdf?dl=0


One of my concerns is the wires from the PI to the .1 caps to the 6v6 grids. I wonder if there's any ill effect of twisting these together, or other problems you guys can spot in how I've placed things? (I can't move the 6v6's more to the right, since they would hit the speaker - I have a celestion g12-65 lying around that I hope would sound good in this amp???)
Let me know what you think.

[HotBluePlates]

I think the wires from phase inverter to the coupling caps looks sensible. Long output wires, short grid wire length.

You don't need to twist those, but I don't think there would be any harm if you did.

Looking at the wire for the feedback from the speaker jack, I presume it was drawn the way it was because it was a convenient way to represent the wire in the program. I'd personally keep it right against the back chassis wall as it ran to the right from the speaker jack, and then have one straight shot to the terminal lug where it will connect. You'll want to keep any wiring attached to high impedance circuits (like grid wires) away from that feedback wire.

[arjepsen]

Yeah, I haven't messed around with the precise placent of the NFB wire yet - though I wonder if it's a problem to have it too close to the "reverb out" wire...?

[HotBluePlates]

It just occurred to me you have the split load inverter at the last preamp tube before the output tubes (call this V4?), but have the gain stage which directly feeds it one tube away (V3?). Why? I'd put those right together, since they're sequential in the circuit.

I know Fender didn't do it that way, but you can. No real reason the tremolo oscillator has to be right next to the phase inverter. It would help keep the feedback wire away from the reverb return as well.

You're missing the series 2.7kΩ resistor for the speaker jack to the 47Ω resistor to ground.

Would you consider a terminal strip on both sides of the tube sockets? It seems to me you're having to fold a lot of things over to the terminal strips on one side of the sockets. One example would be my 25L15-style amp. Wiring from socket lugs to turret strips is very short & direct, and parts mostly span from one strip to the other above the tube sockets.

I swiped the idea from Tektronix scopes: