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Reel to Reel Tape Machines / Studer A810 with unbalanced preamp...
« on: February 13, 2014, 04:03:31 AM »
Hi to all!
Last night I connected a Studer A810 with XLRs output to my McIntosh C28 RCAs with a dedicated cable (XLR -> RCA). I utilized the C28 rear inputs REC in. I didn't connected the REC out because I was interested in playback only.
The C28 is freshly refurbished and serviced so fully functionally and within specs. And then I realized a severe hum even without signal and even disconnecting the tape machine and just leaving the cables... The hum is important and intolerable with the preamp volume pot beyond 12 o' clock. I checked the cables and I noted that all the 3 pins of XLR are isolated between them. I conencted another cable (always XLR to RCA) but with pin 1 nad 2 of XLR connected and the hum is still present even less loud...
May be the cables are not suitable and leading to unwanted ground loops?
Should I need this?
http://www.ebay.it/itm/Jensen-Transformers-PC-2XR-XLR-RCA-Audio-Converter-Balanced-to-Unbalanced-/400456028519?pt=US_Signal_Amplifiers_Filters&hash=item5d3d0a1167
Thank you for expert help!
Guglielmo
Last night I connected a Studer A810 with XLRs output to my McIntosh C28 RCAs with a dedicated cable (XLR -> RCA). I utilized the C28 rear inputs REC in. I didn't connected the REC out because I was interested in playback only.
The C28 is freshly refurbished and serviced so fully functionally and within specs. And then I realized a severe hum even without signal and even disconnecting the tape machine and just leaving the cables... The hum is important and intolerable with the preamp volume pot beyond 12 o' clock. I checked the cables and I noted that all the 3 pins of XLR are isolated between them. I conencted another cable (always XLR to RCA) but with pin 1 nad 2 of XLR connected and the hum is still present even less loud...
May be the cables are not suitable and leading to unwanted ground loops?
Should I need this?
http://www.ebay.it/itm/Jensen-Transformers-PC-2XR-XLR-RCA-Audio-Converter-Balanced-to-Unbalanced-/400456028519?pt=US_Signal_Amplifiers_Filters&hash=item5d3d0a1167
Thank you for expert help!
Guglielmo