S.I.R. 100W SuperLead Schematic pt. II

[Antonio]

RG58 - appears to be solid instead of stranded core conductor, 22 AWG. .195" diameter, about 31pF per foot, high working voltage rated, insulation is not great and will melt easily if heat applied too long. I'd try to seek out some coax with Tefzel or Teflon insulation, tinned and stranded copper core 22 - 20 AWG. You assume the risk. If you choose to do the mod, do it as best and safely as possible.

Thanks for the heads up, Coffee!

Here in Brazil there is no suitable cable for hot shield.

I'm thinking of asking a friend to bring this cable from Europe, it looks good!

https://www.tube-town.net/ttstore/coaxi ... g-187.html

What do you think of this one?

Thank you so much!

[CoffeeTones]

The capacitance per foot is low, so you would need to use one foot to get about 20pF for the hot shield effect IMO.

Your linked description doesn't make clear the material of the center conductor (Staku stranded wire). From random data sheets, RG187 appears to be plated steel, stranded center conductor. Tinned or silver plated, pure copper is preferred IMO.

32 - 36pF per foot is better since you really shouldn't need a one foot piece from input to V1. (6 - 8 inches would provide about 18 - 24pF).

[Antonio]

The capacitance per foot is low, so you would need to use one foot to get about 20pF for the hot shield effect IMO.

Your linked description doesn't make clear the material of the center conductor (Staku stranded wire). From random data sheets, RG187 appears to be plated steel, stranded center conductor. Tinned or silver plated, pure copper is preferred IMO.

32 - 36pF per foot is better since you really shouldn't need a one foot piece from input to V1. (6 - 8 inches would provide about 18 - 24pF).

Great to hear that, Coffee!

I'm going to look for a cable that meets those specifications you gave me.

Thank you very much!