Here is a cheaper way to set that up that works - Ralph - Tube DIY Asylum

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Here is a cheaper way to set that up that works

In Reply to: rca to xlr posted by backendloaded on September 7, 2014 at 06:20:11:

I am therefore assuming, like the other on this thread, that you mean 'input' not 'output'.

If so, you don't need a transformer to have a differential input connection and the amplifier can process both phases in the differential domain, without serious modification to the amp.

The hardest part is installing the XLR connection itself. Pin 1 is the RCA circuit ground (not chassis) and pin 2 is the same as the center pin of the RCA. The real question is what to do with pin 3:

If you have a cathode bypass cap in the first stage, lift it from ground and tie it to pin 3. When running single-ended, install a jumper from pin 3 to pin 1 to restore the connection.

If there is no cathode bypass capacitor, you have to sort out what the value of one would need to be, then install it between pin 3 and the cathode of the input tube. Its OK if feedback is arriving at this point. For single ended operation the jumper (above) should not be installed.

This connection is not balanced, but it is differential. Some balanced preamps may have a problem driving pin 3 but IME its not a big deal. How differential is this connection? The numbers are pretty good- if you tie pin 2 to pin 3 of the XLR you will find the CMRR to be quite high.

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Follow Ups Full Thread

Topic - rca to xlr - backendloaded 06:20:11 09/07/14 (12)

Here is a cheaper way to set that up that works - Ralph 09:04:28 09/08/14 (0)

RE: rca to xlr - Caucasian Blackplate 20:22:36 09/07/14 (0)

RE: rca to xlr - Eli Duttman 06:59:36 09/07/14 (9)

RE: rca to xlr - backendloaded 08:34:57 09/07/14 (8)

RE: rca to xlr - HotStamper 10:06:18 09/07/14 (0)

RE: rca to xlr - Tre' 08:38:50 09/07/14 (6)

RE: rca to xlr - backendloaded 05:44:43 09/10/14 (5)

RE: rca to xlr - backendloaded 07:59:00 09/10/14 (4)

If you want to create a balanced output from your phono section - Ralph 08:13:27 09/10/14 (3)

RE: If you want to create a balanced output from your phono section - backendloaded 08:23:31 09/10/14 (2)

RE: If you want to create a balanced output from your phono section - Tre' 11:28:02 09/10/14 (0)

RE: If you want to create a balanced output from your phono section - Ralph 08:40:24 09/10/14 (0)

Follow Ups

Here is a cheaper way to set that up that works - Ralph 09:04:28 09/08/14 (0)

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