D'Lite question - where to use and terminate shielded cable

[markmalin]

I'm using Normster's layout diagram and schematic. As I'm building, I was wondering about the sheilded cable. From what I can tell, the connection to the input jack, the Volume, Master Volume and Overdrive look like they should be shielded. If nothing else, I'd like to shield the input to the first gain stage.

I'm wondering.... I know you only terminate (i.e. to ground) the shield on one side. Where is the best place to terminate the shield for the input jack? Is it necessary to terminate one side of the shield for the other 3 runs of coax?

Here's another general question. Is George L cable OK to use inside a chassis? I've repaired Fenders before using this cable, but it's rather stiff. I got to thinking, I'm not sure if it's equivalent to RG-174, for instance.


Thanks for the help guys. I sure can't wait to get this thing done and see what it's going to sound like

Cheers,
Mark.

[tele_player]

Yes, those 4 get shielded cable. The connection from the input gets grounded at the terminal strip on V1. The other 3 get grounded to the ground buss which runs above the pots.

[markmalin]

Thanks, tele_player!

Mark

[dogears]

Actually, the master volume should not be shielded. Both overdrive controls get the shielded, not the master.

Also, do not use George L. Find good coax with less than 30 pf/foot rating. This is important. Too high capacitance will suck harmonics and tone.

[tele_player]

Normster's layouts and photos, linked on the Brown Note site, show shielding on the master, which is where I got my info.

I'm building another DLite now, I'll try it Scott's way on that one.

[dogears]

This is not Scott's way

Dumble never used shielded on non HRM global masters. Ever.

Normster's layouts and photos, linked on the Brown Note site, show shielding on the master, which is where I got my info.

I'm building another DLite now, I'll try it Scott's way on that one.

[Funkalicousgroove]

He did in the Overdrive Delux, but it's a TRAVESTY inside

[Structo]

[IMG:640:376]http://i23.photobucket.com/albums/b392/ ... s20Mod.jpg[/img]

[tele_player]

This is not Scott's way

Dumble never used shielded on non HRM global masters. Ever.

Normster's layouts and photos, linked on the Brown Note site, show shielding on the master, which is where I got my info.

I'm building another DLite now, I'll try it Scott's way on that one.

OK, not Scott's way... but it's reasonable for builders of commercial kits to use the layout and schematic provided by the kit vendor. Even if it's not perfect, it's the best way to achieve some level of consistency. Revision numbers on schematics and layouts would be nice, too.

[dogears]

True... But sometimes you have to take into account the "why" and not that it was done. OD controls get shielded, master gets none. Not needed. In fact, the amps sound better with no shielded there IMO. On the other hand, if the Dlite had an oscillation, then the shielded may have been called for. I don't think it would oscillate though.

This is a Dumble discussion forum, not the Brownnote forum. Since the question was asked, I answered with the correct implementation.

This is not Scott's way

Dumble never used shielded on non HRM global masters. Ever.

Normster's layouts and photos, linked on the Brown Note site, show shielding on the master, which is where I got my info.

I'm building another DLite now, I'll try it Scott's way on that one.

OK, not Scott's way... but it's reasonable for builders of commercial kits to use the layout and schematic provided by the kit vendor. Even if it's not perfect, it's the best way to achieve some level of consistency. Revision numbers on schematics and layouts would be nice, too.

[markmalin]

Actually, the master volume should not be shielded. Both overdrive controls get the shielded, not the master.

Also, do not use George L. Find good coax with less than 30 pf/foot rating. This is important. Too high capacitance will suck harmonics and tone.

What about the input to the first gain stage (from the input jack)? I've seen it sheilded on BF and SF Fenders, but not on Tweeds. Is it necessary here?

Mark.

[dogears]

Yep. I follow the way Dr. D did it.

Actually, the master volume should not be shielded. Both overdrive controls get the shielded, not the master.

Also, do not use George L. Find good coax with less than 30 pf/foot rating. This is important. Too high capacitance will suck harmonics and tone.

What about the input to the first gain stage (from the input jack)? I've seen it sheilded on BF and SF Fenders, but not on Tweeds. Is it necessary here?

Mark.