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Old 29th December 2002, 01:49 PM   #1
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Default A wiring question.

Hello all,

I have a basic question. Let's say that I have a CLCRC power supply in the amp that I'm building. The amp is a PP EL84. The two center taps from the output transformers connect at the second cap in the filter (220uF 450v). Then comes a 5K resistor in the filter section after which two wires leading to the plate resistors of two separate 12AX7's are connected at the third capacitor (also 220UF 450v). My question is this: Can I twist the ouput transformer center tap wires and the 12AX& plate wires together for the sake of neat routing without any ill effects. The wires will be at two different potentials with respect to ground. I'm thinking that the wire with the higher voltage might impose a hum into the 12AX7 plate wire but I may be splitting hairs.

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Old 29th December 2002, 01:53 PM   #2
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Default TWISTED

Hi,

Quote:
12AX7's are connected at the third capacitor (also 220UF 450v). My question is this: Can I twist the ouput transformer center tap wires and the 12AX& plate wires together for the sake of neat routing without any ill effects.
Don't do this.
Keep the wires separate,don't twist them together.
You would induce stray capacitance and crosstalk between the stages.

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Old 29th December 2002, 01:56 PM   #3
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Thanks Frank.

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Old 29th December 2002, 02:07 PM   #4
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Frank, when you say separate. How much separation are we talking about. One inch? Two inches?

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Old 29th December 2002, 02:08 PM   #5
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Default DIVORCING THE WIRES

Hi,

An inch should do.

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