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Old 7th April 2012, 01:10 AM   #1
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Default tube buffer noise cancellation

just kicking this around for ideas. My amps and DAC have both RCA and XLR. Right now Im running DAC>tube buffer>amp via RCA. I have two tube buffers which are identical. Was thinking of taking two XLR to Dual RCA cable and setting up each tube buffer to handle the inverted and non inverted signals of one channel. So one box per channel. Power supply is common in the tube buffer. I'm wondering if using the buffers in this manner would cancel out remaining background noise in as much as noise is cancelled out in P-P circuts of amp output stages.
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Old 7th April 2012, 04:20 AM   #2
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Tell us more about the noise? Where is it coming from? If you run the system with the buffer removed does the noise go away?
Typically Solid State stuff has the advantage of being quiet to the point you do not hear it! For noise cancelation the noise needs to be common.
My recommendation is to minimize the noise before you go to the effort and complexity of your proposed balances circuit. Or jump in to do it for fun.
DT
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Old 7th April 2012, 07:04 AM   #3
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perhaps an ltp stage instead?
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Old 7th April 2012, 03:59 PM   #4
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I got rid of most of the noise by implementing a suggestion from a fellow forum member which was to ground pin 9 of the tube. Prior to that , the noise was objectionable. Now, the noise is very faint during quiet passages while playing at moderate sound levels. The circut uses AC heaters. Rather than convert to DC heaters, install chokes in the PS, add OC2 type tubes, and fine tune capacitors, I was thinking I could kill two birds with one stone....patch cord for XLR and cancel out remaining power supply based back ground noise.
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Old 7th April 2012, 11:36 PM   #5
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biasing the filaments with dc, 1/4 of B+ worked for me all the time, geting rid of hum and noise.......
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