Quote:
Originally Posted by A27Hull  Thanks Zmix.
I guess everybody working with this amp has been lucky to this point.
Granted its still a 2 prong device.
Is it, electronically speaking, that using the switch with the small value cap in the modern situation (3 prong) would create a short of 120 to the chassis, via a bypass of the intended circuit, at a different impedance of that that would normally exist between circuit ground and chassis? |
Yes you are correct with respect to the 60's grounding; they did not exist back then.
I did not mention the cap being switched because I would NEVER use them with a properly grounded cable/chassis.
One more note about the cap being switch; it can be a very dangerous thing, have seen those caps shorted and then you have a full 120V on the chassis.
The caps can and do leak current into the chassis, and if not bleed off via a real ground you can have 120V on the chassis.
Today with NEW unbalanced 2 prong gear you can simply reverse the AC plug and can change the ground noise, if that is a problem.
It changes the AC phase going to the power transformer which sometimes helps with hum/noise.
The internal grounding is usually floating, since it has no REAL AC ground point, and when the unbalanced signal is plug in to something that IS grounded is uses THAT for its ground also.
Hope this makes sense