Coax cable!

[grtamp]

Hi, where you can find the white coaxial cable type that I can see in the #124 photos and other Dumble?

Thanks

[markusw]

Don't know if this is what was used in 124 but maybe try RG188 at www.apexjr.com.

Regards,

Markus

[grtamp]

I'll try to ask!

thanks very much!

[amplifiednation]

From what I recall the white coax can be tough to find!! Steve at apexjr is great and has a lot of wire choices, fast shipping too

[catears]

I have about 50 feet of RG59 Thin Net that is grey, not white but looks great and a quality coax. Has a foam insulator, 16.5pf/ft. If you are interested in some PM me.

[img:400:300]https://tubeamparchive.com/files/thumbs ... 22_166.jpg[/img]

[brentm]

One thing I found while looking for coax in this amp, was just how common copper clad steel center conductors are. I was at a thrift shop and found some old nice white RG59 I thought would be great for the build. Got it home and checked it with a magnet and it was a steel center conductor. It looked like fairly old cable too...

I guess if you want a solid copper conductor, best thing is to check it with a magnet.

I ended up going with LMR-195. Not sure if I'd recommend it as it's pretty difficult to work with. The specs look great tho.

[telentubes]

I got some of the coax that markusw mentioned from Apex Jr. It is the RG188 and I believe it's silver on copper. Seems to be 22AWG but I'm not certain of that. Great stuff though. Really easy to work with.

[BobW]

Same coax used on my #124 build

[hitchcaster]

finding good coax can be tricky on the amps... i think two rock was using their guitar cable for a while.
i have the same question about the coax that he used for the dumbleator cables.. anyone who knows willing to say?
thank you

[Structo]

Not all white Teflon coax is created equal.

If you use a cable that is very low capacitance it can make the amp a bit shrill sounding.

I think the stuff that HAD used was around 30pf/ft.

The last stuff I got from Apex Jr. was about 35pf/ft according to my meter.
Not sure of the gauge but at least 20ga.

As you go up in capacitance it will start to shave a bit of high frequencies off the top end.

Which can be desirable with some of these amps.

[wavetuner]

Hi Group, I purchased some Rg 188 and the inner stranded core seemed to be a bit stiff to me. From what I can tell digging deeper, the milspec is steel wire copper coated and then silver plated. This cable is meant to be operated up in the much higher frequency bands where the electrons stay on the skin of the conductor anyway.

It does have a low DC resistance however in spite of that. The shield is most excellent - very close weave silver plated copper. It has a fairly low capacitance to operate in the HF range with low loss. I am not sure if any this would effect the tone in the audio frequency for the lengths we are using in the ODS chassis. I would prefer plain copper center wire for low frequency work IMHO, but I am using all Teflon insulated wire. I would think thin net ethernet rg58U would be good. I don't know that 50 or 75 ohm cable matters much in short run audio but stand to be corrected. HAD seemed to use run of the mill rg59 75 ohm coax like low end cable TV wire.
Jim

[ToneMerc]

HAD seemed to use run of the mill rg59 75 ohm coax like low end cable TV wire.
Jim

There's a fair share of later generation Dumbles with RG188 type coax and it's appears to be in D'lators as well.

As far the external patch cables RG400 has about the same pf/ft specs as RG188U. It looks very similar the coax seen in some RF D'lator gear pics. Here's one of the 7' loops I use with the D'Lator. I view the coax cable as a tuning aid whether inside the amp or outside. I know it's not only me because I've had two guitarists that could blindly tell when the 14' of RG400 was in the loop path.

TM

[boldaslove6789]

HAD seemed to use run of the mill rg59 75 ohm coax like low end cable TV wire.
Jim

There's a fair share of later generation Dumbles with RG188 type coax and it's appears to be in D'lators as well.

As far the external patch cables RG400 has about the same pf/ft specs as RG188U. It looks very similar the coax seen in some RF D'lator gear pics. Here's one of the 7' loops I use with the D'Lator. I view the coax cable as a tuning aid whether inside the amp or outside. I know it's not only me because I've had two guitarists that could blindly tell when the 14' of RG400 was in the loop path.

TM

A Friend with a Dumble Overdrive Reverb told me that he got two RG-400 cables from HAD when he received the amp for use with a ((Stereo)) Dumbleator.

[brentm]

Hi Group, I purchased some Rg 188 and the inner stranded core seemed to be a bit stiff to me. From what I can tell digging deeper, the milspec is steel wire copper coated and then silver plated. This cable is meant to be operated up in the much higher frequency bands where the electrons stay on the skin of the conductor anyway.

Jim

The magnet is your friend. Copper won't be attracted to a magnet unlike steel. It's hard to tell visually if you have copper coated steel but it cannot hide from a decent magnet.

[wavetuner]

Yes, I didn't mention it, before I looked up the spec I used a neodymium magnet and the center conductor is definitely magnetic, the shield is not. Now I'm curios on the 400 spec. Hey, if it sounds good in the loop via a blind test, that's good enough evidence for me! The way Dumble's sound, there is always some Mojo hidden somewhere, probably not by accident!