"Dave Plowman (Nutcase ****head )

Can anyone explain the Quad 405 internal grounding?

** Not to a raving pommy **** like you.


On all, the 'power' ground is via the heatsink to chassis.

** Basic electrical safety required by law in most countries for non class
II electrical items with user accessible metalwork.


On the DIN input ones, the 'signal' is grounded to chassis at the DIN
socket.

** Safety ground for the Quad 33 pre amp and FM3 tuner which have none of
their own.


With the board removed, there is 10 ohms between signal to power ground -
as expected due to R2.

** Ground loop breaker.


On late 405-2 with phono connectors, the phonos are isolated from the
chassis.

** Most pre amps and tuners with phono output are either safety grounded or
class II.


On the early amp with nothing connected, DC at the output is about 2 mV.
On the phono version, 25 or so.

** DC to chassis or DC to speaker ground ?

I'm guessing it's to do with early amps not having a mains ground ....

** You just posted that they ALL did.

**** off - you stinking, pommy, autistic retard.



..... Phil