You would not connect the center tap at all

Amp/Preamp Asylum

Looking for a new Amp or Preamp? If you're after tubes, post over here.

In Reply to: RCA mic preamp (BN-2A/OP-6) posted by Thermionic27609 on July 15, 2015 at 08:59:26:

-Connecting the center tap will degrade CMRR (Common Mode Rejection Ratio).

The ground pin (pin 1 on the XLR) should be tied to circuit ground but otherwise should not engage the audio signal at all. IOW, the output is occurring between pins 2 and 3 of the XLR and is ignoring ground. As a result, a properly wired transformer used for balanced operation will be a floating winding.

You might want to read AES file 47 about this topic and there is an excellent primer on the Rane website, linked below.

Sound System Interconnection (Open in New Window)

This post is made possible by the generous support of people like you and our sponsors:

Sonic Craft

Follow Ups Full Thread

Topic - RCA mic preamp (BN-2A/OP-6) - Thermionic27609 08:59:26 07/15/15 (3)

You would not connect the center tap at all - Ralph 09:58:19 07/15/15 (2)

RE: You would not connect the center tap at all - Thermionic27609 11:53:22 07/16/15 (1)

That might be correct - Ralph 12:50:07 07/16/15 (0)

Follow Ups

You would not connect the center tap at all - Ralph 09:58:19 07/15/15 (2)

RE: You would not connect the center tap at all - Thermionic27609 11:53:22 07/16/15 (1)

That might be correct - Ralph 12:50:07 07/16/15 (0)

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.