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09-15-2018, 12:51 AM
Hi Guys
That would depend on which of the RG-174 parameters are the most important to you and what you were using it for? Obviously, we are interested in using for audio, but is for inside or outside of a chassis? You can use the same coax for both but you might have to be more careful about not stepping on foil shield more than braid, for example.
Inside the chassis you try to use thinner diameter coax and 2-conductor cable especially if there will be a lot of wiring. Remember that all the currents in a tube amp are low, especially signals in the preamp where you are likely to want coax, so the inner conductor gauge can be very small. Voltages are low, too, so the insulation layer can be thin, which should lead to lower capacitance.
Note that it is a mistake to shield all three connections to a triode as this adds significant capacitance and kills the frequency response of the circuit. Running the grid only through coax is okay.
Braid provides better magnetic shielding than foil-plus-drain-wire. Foil provides complete electrostatic shielding. So you decide which is more relevant in the chassis or for a given signal run.
Since manufacturers change their product line every now and then, and because availability of certain wire is inconsistent or changes, too, it is best to use the search functions at Mouser or Digikey to see what is available with the specific priority of parameters you might have, and then with altered priorities. That will give you actual part numbers and brands that you can use to check availability from other suppliers.
That would depend on which of the RG-174 parameters are the most important to you and what you were using it for? Obviously, we are interested in using for audio, but is for inside or outside of a chassis? You can use the same coax for both but you might have to be more careful about not stepping on foil shield more than braid, for example.
Inside the chassis you try to use thinner diameter coax and 2-conductor cable especially if there will be a lot of wiring. Remember that all the currents in a tube amp are low, especially signals in the preamp where you are likely to want coax, so the inner conductor gauge can be very small. Voltages are low, too, so the insulation layer can be thin, which should lead to lower capacitance.
Note that it is a mistake to shield all three connections to a triode as this adds significant capacitance and kills the frequency response of the circuit. Running the grid only through coax is okay.
Braid provides better magnetic shielding than foil-plus-drain-wire. Foil provides complete electrostatic shielding. So you decide which is more relevant in the chassis or for a given signal run.
Since manufacturers change their product line every now and then, and because availability of certain wire is inconsistent or changes, too, it is best to use the search functions at Mouser or Digikey to see what is available with the specific priority of parameters you might have, and then with altered priorities. That will give you actual part numbers and brands that you can use to check availability from other suppliers.
