Dumble vs Bruno

[FUCHSAUDIO]

[Normster]

I've seen at least one of your main boards, Andy. Very elegant and robust in my opinion. I am curious about one thing though, why are PCB layouts usually a lot different than eyelet or turret layouts? (Is it to avoid jumpers or is there more science to it than that?)

[BobW]

I've seen at least one of your main boards, Andy. Very elegant and robust in my opinion. I am curious about one thing though, why are PCB layouts usually a lot different than eyelet or turret layouts?

Normster, PCB layout works best when the circuits are planar as possible, this eliminates unecessary jumpers, and helps keep the circuit nodes as close as practical. Ideally a zero lead length eliminates inductive lead length and cuts down on stray capacitance, doing so, also cuts down on bandwidth limiting. Since zero length is not practical, rearranging components to provide smaller trace lengths keeps the board as planar as possible and improves bandwidth by reducing the inductive and capacitive properties. It may or may not be a big issue with audio components, but I have rearranged components many times on switching power supply boards (~ 500 khZ) in order to eliminate inductive issues.

Andy, Congrats, that's a great looking power filter board, good layout and quality silk screening.

[pamaz67]

Hi all of you.
As any of you out there I have a big passion in guitar amps.
I have a decent experience in the so called hi-end hi fi too.
This same debate (ptp vs pcb) is just a never ending story.
What is certain is just that with low complexity circuits like guitar amps are, and where is possible to use ptp, this technique involves usually a lower number of solder contacts between components.
Another certain thing is that for radio freq circuits most of the time it's easier to get the desired results with ptp than with pcb.
On the other hand a cell phone is a really delicate product to realise and is made out on pcb.
Coming back to guitar amps, the same "good feelings" that i found on dclones wired ptp and other ptp jewels, I got them also in pcb amps like for example bogner xtc, CAA, egnater mod series and Fuchs for sure.
Note that I have on hand all of this stuff on daily basis ( not my stuff unfortunately), as at this time I'm servicing these brands here in Italy, so i'm talking with some elements at my hands.
What I mean is that a properly designed pcb could be as good as a ptp thang when is properly realised.
In any case, if you really want to see the paramount of pcb design for audio/music applications, pls. check the internal shots of any Spectral hifi pre or power amp. That is really art.
Ciao

Paolo

[Smitty]

That's right. Laser cut Oliner Vulcanex and solid core wire. Guess I'm just a Leo wannabe.

The main reason I use this style of construction is twofold. The first is that I know it will last forty or fifty years. Perhaps longer. The second is that these amps are custom voiced and will likely get revoiced at some point. Swapping components is very simple and you just can't damage an eyelet and vulcanex with a soldering iron.

Oh yeah, those mil spec components ought to last awhile, too.