In article ,
Phil Allison wrote:
"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.

That is a mains ground.


** Yes - and YOU made no distinction

By using 'power' I thought ...

You didn't think before jumping in with your usual insults. In the UK one
talks about mains rather than power. And besides, it should have been
obvious if you had a brain cell still working.


** You are an autistic retard with NO ability to think.



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.

More Phil********. On the 33, the mains input ground pin is connected
to chassis.

** The supplied AC leads are only 2 wire here in Aussieland.

I do not own a 405, 33 or FM3 and do not live in the UK.

If I wanted to know about OZ mains I'd ask in an Oz group. ;-)

But I'll bet your wrong. With the 33/303 or 33/405. the preamp was earthed
via the mains lead. The mains to the amp came from the 2 pin switched
outlet on the 33. It *only* got its mains earth via the signal cable. Same
with the FM tuner. But they all have a three pin mains inlet, so can be
used 'stand alone' with a three pin mains lead, and still be earthed.

My guess is using a DIN connector to provide a safety earth would not pass
regs these days.


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 ?

Are you really that thick? On the 405, they are the same.


** I do not own a 405, 33 or FM3 and do not live in the UK.

Last time a saw any of them on the bench was over 10 years ago.

And you didn't look closely at it even then...

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

** You just posted that they ALL did.

Make that 'when used as part of a Quad installation' then.


** All 405s have a 3 pin IEC mains inlet, so are safety grounded.

The earlier 303 also had a three pin mains inlet. But like the 405 was fed
with a two pin lead on a Quad setup to prevent a ground loop.

I have never come across anyone so ****ing stupid as to interfere with
this here in Australia.

Not surprising if they're all as thick as you.

--
*Plagiarism saves time *

Dave Plowman London SW
To e-mail, change noise into sound.