Audiophile - plywood PCB ?

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Go to the bottom row of the gallery, then to the second pic from the left.

The other pics on the bottom row show the same thing from other angles.

That "pcb" looks like plywood to me. Does it improve the sound ? ;)

The dual motor turntable a couple of rows up from there looks interesting. Why ?

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

Tom

Reply to
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

Reply to
kreed

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

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

Tom

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Reply to
Tom

"kreed"

** Gives it a better timbre I believe .....

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

Reply to
Phil Allison

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 :)

--
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Reply to
Jasen Betts

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 :)

Reply to
keithr

Plywood Circuit Board? :)

Reply to
Clifford Heath

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

Reply to
Swanny

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

Reply to
no one

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