Low pf shielded cable

[BobW]

Remember guys since coax cables are generally used for RF applications they measure the capacitance typically at 100kHz. You can't assume the capacitance quoted in the data sheets is linear from DC to blue light.

I used Belden 8241

OK now explain to me how the capacitance varies with frequency.

It's called reactance, (Xc). http://www.epanorama.net/documents/wiri ... cable.html

[rmb550]

Remember guys since coax cables are generally used for RF applications they measure the capacitance typically at 100kHz. You can't assume the capacitance quoted in the data sheets is linear from DC to blue light.

I used Belden 8241

OK now explain to me how the capacitance varies with frequency.

It's called reactance, (Xc). http://www.epanorama.net/documents/wiri ... cable.html

Sorry -- the post I quoted said CAPACITANCE varies with frequency, and I am fairly certain that it does not. Capacitive reactance is a different story.

[BobW]

OK now explain to me how the capacitance varies with frequency.

It's called reactance, (Xc). http://www.epanorama.net/documents/wiri ... cable.html

Sorry -- the post I quoted said CAPACITANCE varies with frequency, and I am fairly certain that it does not. Capacitive reactance is a different story.

For some reason, my inital post has struck a nerve with you. Yes it IS reactance, and based on your posts you already knew that, but for some reason, you are looking to bust someones balls over nothing! Get over it, and post something constructive.

[glasman]

Sparkle Factor. Jeez I had forgot about that one .


I have been using some stuff that Gil and I rooted out of Apex Electronics. Measures at 25pf / ft. Center conductor is 18ga stranded, full teflon center and outer jacket. The shield is standard braid no foil.

This stufff is great and I will CRY when I run out of the supply I have on hand.

Hey Gil, wanna make a run for ME .

Gary

[tubedogsmith]

FWIW, I pull the hot lead out of GeorgeL cable and push 18ga teflon stranded in. Probably not really practical for most but I got three big rolls of GeorgeL years ago at a store closing.

[ayan]

Sparkle Factor. Jeez I had forgot about that one .


I have been using some stuff that Gil and I rooted out of Apex Electronics. Measures at 25pf / ft. Center conductor is 18ga stranded, full teflon center and outer jacket. The shield is standard braid no foil.

This stufff is great and I will CRY when I run out of the supply I have on hand.

Hey Gil, wanna make a run for ME .

Gary

Hi Gary,

That stuff is good, but the wire is on the stiff side for my taste. I used it on my last Dumbleator, I believe, but for amps I used the thinner stuff I got from there as well. In the end, the trick is to adjust overall brightness for every amp anyway, so I don't think I'll feel the world will come to an end when I run out of wire. Also, much more likely is that I will run out of amps to build before I run out of wire.

However, I wouldn't wnat to see a grown man cry, so if I am ever in the Apex neighborhood, I will call you and see what you need. The likelihood of that occurrence is on the low side.

Great seeing you the other day at NAMM,

Gil

[JamesO]

For what it's worth, I ordered some shielded wire from Antique Electronics (http://tubesandmore.com) a few weeks ago and used it last week.

My soldering is considerably better than what it was when I started two years ago, but I still melt things. I couldn't melt the center conductor to save my life. The wire is thick like the purple Gepco, and the braiding is really easy to work with.

Belden 9394. It isn't on the website, but it's $2.50 a foot. I haven't measured the capacitance because I don't know how.

[glasman]

For what it's worth, I ordered some shielded wire from Antique Electronics (http://tubesandmore.com) a few weeks ago and used it last week.

My soldering is considerably better than what it was when I started two years ago, but I still melt things. I couldn't melt the center conductor to save my life. The wire is thick like the purple Gepco, and the braiding is really easy to work with.

Belden 9394. It isn't on the website, but it's $2.50 a foot. I haven't measured the capacitance because I don't know how.

The spec'd capacitance for that cable is 55pf / ft.

[glasman]

Sparkle Factor. Jeez I had forgot about that one .


I have been using some stuff that Gil and I rooted out of Apex Electronics. Measures at 25pf / ft. Center conductor is 18ga stranded, full teflon center and outer jacket. The shield is standard braid no foil.

This stufff is great and I will CRY when I run out of the supply I have on hand.

Hey Gil, wanna make a run for ME .

Gary

Hi Gary,

That stuff is good, but the wire is on the stiff side for my taste. I used it on my last Dumbleator, I believe, but for amps I used the thinner stuff I got from there as well. In the end, the trick is to adjust overall brightness for every amp anyway, so I don't think I'll feel the world will come to an end when I run out of wire. Also, much more likely is that I will run out of amps to build before I run out of wire.

However, I wouldn't wnat to see a grown man cry, so if I am ever in the Apex neighborhood, I will call you and see what you need. The likelihood of that occurrence is on the low side.

Great seeing you the other day at NAMM,

Gil

Nice to see you at NAMM as well. Who was that girl signing at Moss' room, damn she had a dynamite voice.

Thanks for the offer next time you are Apex. (I know how much you like that place ).

Gary

[Structo]

For what it's worth, I ordered some shielded wire from Antique Electronics (http://tubesandmore.com) a few weeks ago and used it last week.

My soldering is considerably better than what it was when I started two years ago, but I still melt things. I couldn't melt the center conductor to save my life. The wire is thick like the purple Gepco, and the braiding is really easy to work with.

Belden 9394. It isn't on the website, but it's $2.50 a foot. I haven't measured the capacitance because I don't know how.

How did you find out about that Ken?

[rmb550]

My sincere apologies to BobW -- I really wasnt looking to bust anyones balls - but wanted to make sure I wasn't dreaming. I am over it.
On the topic of low pf cable, I would still like an opinion of the relationship or role that the external lead cord plays in the whole situation. Surely that cord plays a much larger role than 7" or 8" of 15-30pF cable inside the amp.
Rob

[thyx]

I would still like an opinion of the relationship or role that the external lead cord plays in the whole situation. Surely that cord plays a much larger role than 7" or 8" of 15-30pF cable inside the amp.
Rob

Absolutely. Another factor is whether or not the wire is stranded or solid-core. Does anybody know of any good, low capacitance solid-core shielded wire?

For guitar cords I like George-Ls. Low capacitance for a guitar cable (I measure about 21pf per foot), and solid-core wire. You can trim it to length with a razor blad, and so is easy to tune to your guitar. That last guitar I tuned one for was one of my Strats, and it measured a little over 14 feet.

But again, does anybody know of any good, low capacitance solid-core shielded wire for inside the amp?

[Structo]

That I can talk about.

I used to use pretty generic guitar cables. Good quality but probably high pf cables.

Then I switched to George L's guitar cables and thought those sounded great!
Had some trouble with the plugs getting them working right and yes the key is to cut the end very cleanly for a good fit.

A couple years ago I bought a Sommer's "The Spirit" cable from Lavacable and I couldn't believe the difference.
$35 for a ten foot cord with high end Neutrik plugs.
Very well constructed and the way they put the ends in is great.
All heat shrink wrapped and well soldered.

Like you have heard the saying before, it was like taking a blanket off of my speakers.
More open, cleaner, more sparkly highs.

So I definitely am in the high end guitar cord camp now.

These cables aren't really high end, kind of entry level high end.

About two months ago I bought a different one from Lavacable,
The Grindy Cop Beast by Sommer.
Weird name I agree but it is a super flexible cable with a kind of transparent jacket that shows a multi-colored cloth weave.
I is a great sounding cable as well.
They are more expensive at $58 for ten feet.

http://www.lavacable.com/sommer.html

[heisthl]

When in doubt about which cable is better quality, do the shake test: plug it into an amp, stretch it out and shake it like a bull whip. If you can hear noises move on. Some cables are actually microphonic.

[rmb550]

For what it's worth, I ordered some shielded wire from Antique Electronics (http://tubesandmore.com) a few weeks ago and used it last week.

My soldering is considerably better than what it was when I started two years ago, but I still melt things. I couldn't melt the center conductor to save my life. The wire is thick like the purple Gepco, and the braiding is really easy to work with.

Belden 9394. It isn't on the website, but it's $2.50 a foot. I haven't measured the capacitance because I don't know how.

55pf/ft. See spec sheet attached