Audiophile - plywood PCB ?

It's plywood but its not a PCB, probably the components are wired underneath with wire. Haven't you seen pre-PCB electronics?

Tom

I realise that, hence the term "PCB" but why use it ?

Older gear I can remember was wired using tagstrips with components wired point to point

On 27/01/2011 10:50 AM, kreed wrote: ...

My guess it is mostly visual effect, helps to extract money from fools.

Tom

"kreed"

But seriously, using plywood as the insulation material for a ( high impedance) valve circuit is a very poor idea - cos wood is hydroscopic.

Once the wood absorbs even a small amount of moisture from the air - the material will become conductive, resulting in serious bias shifts all over the place and maybe producing cracking & squealing noises in the audio output.

I have seen this actually happen when someone decided to rewire a modern "Fender" guitar amp using a hard grey cardboard with solder studs and solid wire in place of the original fibreglass PCB. The problem proved near impossible to fix.

Original Fenders used a similar technique - but Fender had the sense to fully impregnate their cardboard with hot wax beforehand.

.... Phil

kind of like a matrix board, it's not printed on the back (so not a _printed_ circuit board, just a support for the components), look how the wires are terminated on rings of copper. dry cellulose is a good insulator.

I think that's got three motors, like the black one on the fifth row.

run it off 3 phase power, less flutter :)

Definitely plywood, you can see the layers on the edge, but it looks like discrete wiring not printed. Ok I suppose if it is dry and well lacquered, the heat from the tubes should help keep it dry. There is a guy in Canberra who makes expensive tube amps, he uses wooden strips with brass screws as tag strips.

It probably uses high grade Burmese plywood needles :)

Plywood Circuit Board? :)

Couldn't get the Protel router to work on plywood so I used the Makita instead.

wood nt every one want one of these ?? he he he