I'd like to use balanced mic cables for tube heaters and B+ voltages.
Has anyone any experience or comments in doing so?
I am considering using star-quad and grounding the shield at earth.
Has anyone any experience or comments in doing so?
I am considering using star-quad and grounding the shield at earth.
All I know is that such cables are not intended for high voltages or high currents. In practice, it probably depends on the properties of the cable itself. But I wouldn't recommend it personally.
Why use expensive inappropriate cable for a cheap function? There is no need for heater cable to be screened, but it does need to be thick (to avoid voltage drop) and twisted (to reduce induction).
OK. You need to check the max current and voltage handling of the cable. My guess is that it will be insufficient for both heaters and HT. You could use it for internal signal wiring, but it may be too bulky and inflexible for this.
There's two different applications here and two different sets of safety issues. One will kill you, the other will burn your house down. Let's be clear here. There are withstand voltage specs and usage specs - they are different.
Also you should consider the function of a shield - it prevents capacitance coupled voltages but has no effect on magnetic/inductive/current fields.
B+ is usually very easy to filter as you can afford 10's to 100's of ohms so why shield?
Shielding heaters is not effective due to low voltage. Twisted pairs eliminate the magnetic field.
Also you should consider the function of a shield - it prevents capacitance coupled voltages but has no effect on magnetic/inductive/current fields.
B+ is usually very easy to filter as you can afford 10's to 100's of ohms so why shield?
Shielding heaters is not effective due to low voltage. Twisted pairs eliminate the magnetic field.
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