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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#41
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Split rail PS
In article , Dave Plowman (News)
scribeth thus In article , tony sayer wrote: I've ordered up a toroidal transformer and Eddystone box to put it in from CPC. Still free carriage. ;-) A Toriod tranny?, best bet for hum field reduction. Yes - quoted at 1/10th of a 'normal' type. Make sure there no shorted turns thru it.. Quite - although since they are single hole fixing with a kit usually provided you'd have to do something very silly to achieve that. Yes but I've seen it done more then the once but not implying of course!.. Snag is the smallest toroidal I could find is way over sized for this application. Are there any 6VA or so trannies made with low external field? RS components do very small ones from 1.50 VA upwards by Nuvotem not that cheap of course!.. -- Tony Sayer |
#42
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Split rail PS
On Thu, 29 Aug 2013 10:45:01 +0100, tony sayer wrote:
In article , Dave Plowman (News) scribeth thus I've ordered up a toroidal transformer and Eddystone box to put it in from CPC. Still free carriage. ;-) A Toriod tranny?, best bet for hum field reduction. Make sure there no shorted turns thru it.. It is *so* tempting to use a ring crimp on that nice big mounting bolt though! -- |
#43
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Split rail PS
Bits arrived from CPC today so fitted and hum gone. Noise measured on the
output is about 4mV peak to peak, output being standard domestic line level. -- *60-year-old, one owner - needs parts, make offer Dave Plowman London SW To e-mail, change noise into sound. |
#44
Posted to uk.d-i-y
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Split rail PS
In article , Dave Plowman (News)
scribeth thus Bits arrived from CPC today so fitted and hum gone. Noise measured on the output is about 4mV peak to peak, output being standard domestic line level. So thats 4 mv reference to what -10 dBm?.. -- Tony Sayer |
#45
Posted to uk.d-i-y
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Split rail PS
In article ,
tony sayer wrote: In article , Dave Plowman (News) scribeth thus Bits arrived from CPC today so fitted and hum gone. Noise measured on the output is about 4mV peak to peak, output being standard domestic line level. So thats 4 mv reference to what -10 dBm?.. On the same scope, the output shows about 2v peak to peak. Which would suggest the noise is some 54dB down. But I'm sure there is a more sanitary way to measure such devices. However, at a high listening level, it sounds pretty good noise wise when you lift the pickup. -- *I tried to catch some fog, but I mist.* Dave Plowman London SW To e-mail, change noise into sound. |
#46
Posted to uk.d-i-y
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Split rail PS
In article , Dave Plowman (News)
scribeth thus In article , tony sayer wrote: In article , Dave Plowman (News) scribeth thus Bits arrived from CPC today so fitted and hum gone. Noise measured on the output is about 4mV peak to peak, output being standard domestic line level. So thats 4 mv reference to what -10 dBm?.. On the same scope, the output shows about 2v peak to peak. Which would suggest the noise is some 54dB down. But I'm sure there is a more sanitary way to measure such devices. Yes a wideband audio meter. I'd have thought that would be a bit better than that Dave, what's in-between the input device and the output?.. However, at a high listening level, it sounds pretty good noise wise when you lift the pickup. .... -- Tony Sayer |
#47
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Split rail PS
On 31/08/13 18:50, tony sayer wrote:
In article , Dave Plowman (News) scribeth thus In article , tony sayer wrote: In article , Dave Plowman (News) scribeth thus Bits arrived from CPC today so fitted and hum gone. Noise measured on the output is about 4mV peak to peak, output being standard domestic line level. So thats 4 mv reference to what -10 dBm?.. On the same scope, the output shows about 2v peak to peak. Which would suggest the noise is some 54dB down. But I'm sure there is a more sanitary way to measure such devices. Yes a wideband audio meter. I'd have thought that would be a bit better than that Dave, what's in-between the input device and the output?.. yes it should be: with a shielded cartridge plugged in the theoretical max SNR of a moving magnet cartridge amp with RIAA eq is around 60-70dB. 60dB is easy. 65dB is not hard., but 70-dB is getting towards 'hand selected devices' and nitrogen cooling :-=) THats with reference to a standard 2mV or so RMS input., However, at a high listening level, it sounds pretty good noise wise when you lift the pickup. .... -- Ineptocracy (in-ep-toc-ra-cy) €“ a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers. |
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