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Old 20th March 2013, 12:21 PM   #11
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
I have just rebuilt a stereo amplifier.
I used XLRs for the inputs.

Pin1 to chassis via the bolts on the metal body of the XLR socket.
Pin2 to Signal Hot on amp pcb.
Pin3 to Signal Ground on amp pcb.

I also added the input plug RF attenuation of 47pF in addition to the more normal 680pF at the amp pcb.

But the big difference from previous.

I used three 47pF to attenuate both differential mode and common mode RF arriving at the input pins.
47pF from Pin1 to Pin2, 47pF from Pin2 to Pin3 and 47pF from Pin3 to Pin1.
Are there any downsides to having these 3 caps on the XLR pins?

If at a later date I add Cordell's Bal to unbal converter stage ahead of the amp pcb, will anything need to be changed at the XLR or will the same physical assembly still work with a balanced input?
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regards Andrew T.

Last edited by AndrewT; 20th March 2013 at 12:32 PM.
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Old 23rd March 2013, 11:15 PM   #12
tvrgeek is offline tvrgeek  United States
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Join Date: Dec 2009
Location: Md
I use standard Belden 1812a mic cable. Flexible, very fine stranded. Remember, before the music got to your ultra perfect pre-amp and exotic mega dollar amps, it went though hundreds of feet of this as well as dozens of NE5534's.
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