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Re: Class A, AB1, B, C Operation/Modes [message #96446 is a reply to message #96354]

Tue, 28 February 2023 19:04

positron
Messages: 97
Registered: May 2020

Viscount

Something else to consider.

First, pin 1 in a power cord is the ground wire, the 3rd prong of a
power plug. See Fig. 1 below.

I don't know if this has been mentioned earlier or in another post,
but when two or more components in a system have pin 1 connected to
the same outlet "terminal", there is a connection between the signal
ground of the components involved. See Pin1.jpg

In any case, musical information/signal current not only returns via
both left and right interconnect shields, but also through the pin 1
power cord ground wires, from component to component signal grounds.

This mixes the channels together to some extent, and is frequency
sensitive. There are all sorts of negative ramifications to the
musical parameters, such as sound stage, dynamics, frequency response
etc. (I know, the resistances and inductances seem small but I am
testing 1 part per million in my speaker crossovers, so it does
matter to some extent.)

As above, the mixing is non linear since we have two factors to
consider, resistance and inductance of the interconnect cable(ic)
shields and pin 1 power cord wires.

The ratio of the shield resistance to pin 1 resistance will not be
the same as the ratio of the shield inductance to pin 1 wire
inductance.

There are solutions, but please be careful if/when implementing them.

1. Only have one component with pin 1 connected to ground. This
requires connecting all ics before plugging in any AC power plugs.
I do not accept any responsibility. You perform this
at your own risk of injury.

2. There is a second method, but I do not accept any
responsibility. You perform this at your own risk of injury.

It is installing multiple resistors, each high power, very
low ohmage between pin 1 and the component. The preamplifier is
the logical choice since the AC current draw is low, the rated
fuse is low.

(Amplifiers are higher current with higher amperage fuses,
so I would not install any resistors in one.
Do so at your own risk of injury.)

For instance, 3 twelve watt resistors in parallel, each resistor
4.5 ohms would result in 1.5 ohm total. The fuse should easily blow,
the resistor combo will be 30 watts rated. Even if one or two
resistors open, the fuse should easily blow first.

I cannot state this enough. Please be careful. I do not
accept any responsibility for any accidents or injuries.

cheers

pos

Attachment: AC Plug Pin 1, Wire.pdf
(Size: 85.58KB, Downloaded 58 times)
Attachment: PIN1.jpg
(Size: 51.88KB, Downloaded 75 times)

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[Message index]

		Class A, AB1, B, C Operation/Modes By: positron on Sun, 05 February 2023 20:40
		Re: Class A, AB1, B, C Operation/Modes By: Wayne Parham on Sun, 05 February 2023 20:54
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Mon, 06 February 2023 20:38
		Re: Class A, AB1, B, C Operation/Modes By: positron on Tue, 07 February 2023 16:13
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Tue, 07 February 2023 19:33
		Re: Class A, AB1, B, C Operation/Modes By: positron on Tue, 07 February 2023 20:37
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Thu, 09 February 2023 21:01
		Re: Class A, AB1, B, C Operation/Modes By: positron on Thu, 09 February 2023 21:35
		Re: Class A, AB1, B, C Operation/Modes By: positron on Tue, 28 February 2023 19:04
		Re: Class A, AB1, B, C Operation/Modes By: Wayne Parham on Wed, 01 March 2023 08:28
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Wed, 01 March 2023 19:45
		Re: Class A, AB1, B, C Operation/Modes By: positron on Sun, 05 March 2023 00:33
		Re: Class A, AB1, B, C Operation/Modes By: Wayne Parham on Sun, 05 March 2023 08:05
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Sun, 05 March 2023 08:10
		Re: Class A, AB1, B, C Operation/Modes By: positron on Mon, 06 March 2023 19:01
		Re: Class A, AB1, B, C Operation/Modes By: positron on Sat, 06 May 2023 22:32
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Tue, 09 May 2023 21:30
		Re: Class A, AB1, B, C Operation/Modes By: positron on Thu, 11 May 2023 00:26
		Re: Class A, AB1, B, C Operation/Modes By: positron on Tue, 05 September 2023 23:48
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Fri, 08 September 2023 21:12
		Re: Class A, AB1, B, C Operation/Modes By: BreakneckRedneck on Sun, 24 September 2023 00:42
		Re: Class A, AB1, B, C Operation/Modes By: positron on Thu, 12 October 2023 11:21
		Re: Class A, AB1, B, C Operation/Modes By: positron on Fri, 03 November 2023 12:22
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Fri, 03 November 2023 20:58
		Re: Class A, AB1, B, C Operation/Modes By: positron on Sun, 05 November 2023 01:38
		Re: Class A, AB1, B, C Operation/Modes By: positron on Thu, 07 December 2023 23:12
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Mon, 18 December 2023 20:20
		Re: Class A, AB1, B, C Operation/Modes By: positron on Tue, 16 January 2024 21:32
		Re: Class A, AB1, B, C Operation/Modes By: gofar99 on Wed, 24 January 2024 20:31

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