Where in the World..... is Paul Cornford?

The
Amp Mad Scientist said:
Andy
2:05 AM (6 hours ago)
to me, service
Hi Michael,

That’s really great news and thanks for letting us know exactly what you did to reduce this hum.
It is very good information for amp design so I’ll be sure to share it with martin.

Very Best Regards,
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There ya go, they oughta pay you or least put your name on the next revised schematic!
 
Robert Herndon said:
@chilipeppermaniac - I was wearing out input jacks every couple of months. Then I started using True Tone Jacks that feature dual sets of contacts. Very good quality and not at all expensive...
Click to expand...

There's something else that's pretty cool.
It's called a "snap jack."
It's a guitar cable with magnetically attached plugs.
If somebody trips over the guitar wire, the cable detaches easily without damaging the jack.

You might think this is goofy, but it works surprisingly well. I thought it was pretty cool.

 
Amp Mad Scientist said:
There's something else that's pretty cool.
It's called a "snap jack."
It's a guitar cable with magnetically attached plugs.
If somebody trips over the guitar wire, the cable detaches easily without damaging the jack.

You might think this is goofy, but it works surprisingly well. I thought it was pretty cool.

Click to expand...

Zzyzx is a desert town in SoCal..
 
Clockworkmike said:
The

There ya go, they oughta pay you or least put your name on the next revised schematic!
Click to expand...

Separating the audio signal grounds from the power supply grounds is fairly well known to amp designers.
So I really don't understand why he didn't do that to start with.
My philosophy is that the power supply grounding goes at one far end of the chassis, and the audio ground goes at the other opposite end of the chassis.
The resistance of the metal chassis is between the two grounding points.
From all my testing, this seems to produce the lowest noise....compared to "star grounding."

It made a pretty big difference in the Cornford amp.
 
Amp Mad Scientist said:
There's something else that's pretty cool.
It's called a "snap jack."
It's a guitar cable with magnetically attached plugs.
If somebody trips over the guitar wire, the cable detaches easily without damaging the jack.

You might think this is goofy, but it works surprisingly well. I thought it was pretty cool.

Click to expand...
I googled it but could not find a place that sells them. They still around?
 
Amp Mad Scientist said:
That's weird because it was such a cool idea. And it worked too....
I wonder what happened?
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A great question, but i honest cant find a thing about their parent company, Jodavi , any longer either. Kinda just vanished. The cables i bought from them were at least 10 years ago and used to be a common item on the shelf at Showtime Music the next town over.

Like most things: it probably worked TOO well and was killed off for its durability lol
 
Robert Herndon said:
There's nothing out there...its a ghost town...most famous for the Zzyzx Road Murders.
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I was looking that up a bit. Pretty strange stuff! According to crime statistics, the entire area of San Bernadino County has one of the highest crime rates per population as anywhere in the country, namely the Victorville, Barstow and Baker areas. Zzyzx Rd. near Baker is one of the worst for discovery of dumped bodies!
 
Clockworkmike said:
I was looking that up a bit. Pretty strange stuff! According to crime statistics, the entire area of San Bernadino County has one of the highest crime rates per population as anywhere in the country, namely the Victorville, Barstow and Baker areas. Zzyzx Rd. near Baker is one of the worst for discovery of dumped bodies!
Click to expand...

Lake Arrowhead, Crestline, Big Bear, Blue Jay, Wrightwood and Verdemont are awesome places in San Bernardino County.

Keep in mind that its a huge county, with lots of unincorporated areas, with little, if any, real police/sheriff patrols, so it does have a dark side...
 
syscokid said:
Schematic for @Amp Mad Scientist
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Oh, back to the corn hole again,,,

It turned out that the builder combined the power supply grounds with the audio signal grounds...a really bad habit I see all the time. (like those horrible Ceriatone kits)

After I split / separated the power grounds from the audio signal grounds, a lot of the noise was cured.
And thanks for the schematics; appreciate that.

It's so funny
that a lot of these "genius" amp makers still haven't learned how to get the noise out of their own amplifiers. :pound-hand:
 
chilipeppermaniac said:
That's nuts. Great tidbit to learn for me as a novice diagnostician and repairman.
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Well if you study the way it's built,
all the best amplifiers have the grounds split; signal and power supply.
And all the noisy amplifiers have the grounds combined.

So if you take a noisy amplifier like (horrible) Ceriatone...
you can cut the noise in half (or better) just by separating the grounds.
 
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