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Old 25th June 2003, 01:18 PM   #11
EC8010 is offline EC8010  United Kingdom
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Default Re: Re: Star earth.

Quote:
Originally posted by jarthel
I'm not sure if if the definition of component in your message is every component in the circuit like individual resistors and capacitors.
I'm afraid I meant every individual resistor, capacitor, transformer connection, input, and output connection. And yes, I know, that's an awful lot of wires to go to one point. It's not easy, but you can get all those wires onto a ceramic stand-off if it's the kind that has four wings rather than two.

This solution solves your last question perfectly. The transformer body wants to go to the chassis, which is mains ground.
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Old 25th June 2003, 01:28 PM   #12
jarthel is offline jarthel  Australia
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Default Re: Re: Re: Star earth.

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Originally posted by EC8010


I'm afraid I meant every individual resistor, capacitor, transformer connection, input, and output connection. And yes, I know, that's an awful lot of wires to go to one point. It's not easy, but you can get all those wires onto a ceramic stand-off if it's the kind that has four wings rather than two.

hmm since wires in an amp needed to be short as possible. I assumed this could also mean as few as possible. with every components having longer leads, isn't it that chances of picking up interference/hum also increases?
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Old 25th June 2003, 01:39 PM   #13
EC8010 is offline EC8010  United Kingdom
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Default Re: Re: Re: Re: Star earth.

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Originally posted by jarthel
Hmm since wires in an amp needed to be short as possible. I assumed this could also mean as few as possible. with every components having longer leads, isn't it that chances of picking up interference/hum also increases?
No, it's not a problem. The addition of even 12" of wire (and that should easily be the longest you need) will not add signficant resistance to affect a component. At valve impedances and audio frequencies, even the inductance of that wire is insignificant. OK, if you were daft, and routed one of these wires all the way round the mains transformer, it could pick up some hum, but you will route the wires to be as short and direct as possible.

Tha advantage of star earth is that all the currents flow in the right places without developing unwanted voltages across small resistances. OTL amplifiers deliver significant audio current directly from the HT, so thinking about currents is a good idea.
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Old 25th June 2003, 06:19 PM   #14
Morse is offline Morse  United States
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Hi Jarthel;

>>>...where do you connect the ground for the output?...<<<

Sorry, I should have mentioned that! Normally on an SET I leave the OPT's secondary floating. Of course the MJ design is an OTL design so.....I connected the ground lines from the left and right channels together then tied them to the daisy chain of grounded chassis fittings.

If you look at the pictures at Pics of my new amp! you can see what I mean by chassis plates - all those metal fittings on the wood chassis. The PS trafo is also tied to that daisy chain via one of it's mounting bolts (had to chip away some paint for that to work though).

All the best,
Morse
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