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!

[blacklabel]

Hi guys, it's been a while since I've been back here, lately I've only played on mesa mk III and V

I would like to ask you: has anyone recorded any new takes of #34?

I would like to play it again and it would be nice to have someone to talk to (miked sound only)

[dukeamps]

https://reverb.com/item/73147546-marsha ... mod-sir-36

[dukeamps]

https://soundclick.com/share.cfm?id=14654565

oldie but a goody

[CoffeeTones]

Are you posting the spec?

[dukeamps]

Are you posting the spec? LOL

it was something like 4 10ks and something else, oh yes a 47p bright lol

[CoffeeTones]

This fall weather is bringing back the amp fever!

[dukeamps]

This fall weather is bringing back the amp fever!

I just might fire up the soldering iron again too lol