In article ,
Phil Allison wrote:
"Dave Plowman (Nutcase ****head )
Can anyone explain the Quad 405 internal grounding?
** Not to a raving pommy **** like you.
Still off the meds?
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.
You're a fool That is a mains ground. By using 'power' I thought most
would understand I'm talking about the PS ground.
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. I'd guess the same on the FM tuner. The mains *outputs* on the 33
are two pin. So if you connect a 405 to a 33 using the supplied mains lead
there is no ground connection. The signal DIN cable provides that.
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. The speaker
grounds go to the same place as the PS ground, bolted to the chassis. The
mains ground is also bolted to the chassis a few inches away.
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.
**** off - you stinking, pommy, autistic retard.
Why do you bother replying when it's obvious you know nothing about it?
And you claim to be a Quad expert. Gawd save us.
--
*The older you get, the better you realize you were.
Dave Plowman
London SW
To e-mail, change noise into sound.