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Old 20th April 2013, 02:46 PM   #2391
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Quote:
Originally Posted by Bibio View Post
as far as i know shielded cable has to be terminated at one end only, but i could be wrong.
I've always been told differently, in data networks, both must be connected. Otherwise it acts as an antenna.
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Old 20th April 2013, 03:06 PM   #2392
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Richard Murdey
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Coax cable must have the shield connected both ends. Mic cable (twisted pairs + shield) with Rca jacks can connect the shield at one or both ends, frequently in audio only one end is connected.
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Old 20th April 2013, 05:40 PM   #2393
hajj is offline hajj  Lebanon
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I replaced the RCA jacks on the turntable cables with high quality ones I had lying around (the old ones were low quality, and oxidized beyond repair)
The turntable does not have a grounding cable, so while I was at it, soldered a grounding cable on a tab mounted on the turntables internal frame.

Connected everything up again, with the boards still on the workbench, and the hum was gone!

I'm waiting for the output caps to before I do any critical listening, but it already sounds better than the phono section of my yamaha receiver.
Will report back in a week or so.

Thanks everyone for the help.

Regards

Nick
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Old 20th April 2013, 09:33 PM   #2394
Bibio is offline Bibio  Scotland
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Quote:
Originally Posted by Wirehead.be View Post
I've always been told differently, in data networks, both must be connected. Otherwise it acts as an antenna.
yup i used to be Cisco certed and MCSE's BSc in networking (almost) yada yada but had to give it all up.
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Old 20th April 2013, 11:39 PM   #2395
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Quote:
Originally Posted by hajj View Post
Connected everything up again, with the boards still on the workbench, and the hum was gone!
Good. So it was the RCA connectors do you think?
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Old 22nd April 2013, 06:50 PM   #2396
hajj is offline hajj  Lebanon
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Quote:
Originally Posted by rjm View Post
Good. So it was the RCA connectors do you think?
Most probably, since no problems are to be declared so far
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Old 25th April 2013, 04:02 PM   #2397
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When I built my PC3 I set it for a Dynavector DV20XL (0.3mv and 5ohms)

I have now got a DVXX-2mkII (0.28mv and 6ohm)

Would changing R1 and R2 be beneficial or not?

According to the spreadsheet he gain difference is only 0.5 db

TIA
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Old 25th April 2013, 11:24 PM   #2398
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No, not at all. Just keep R1 and R2 as they are.
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Old 26th April 2013, 08:23 AM   #2399
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Thanks Richard. Saves me burning my fingers (I mean soldering) again
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Old 5th May 2013, 12:29 PM   #2400
Bibio is offline Bibio  Scotland
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if i were to feed the phonoclone outs straight to a computer soundcard (X-FI) would i need to use resistors to set a level and if so what value. would they only be placed on the L+/R+ outs?

or is the output gain not high enough to need them.

thanks
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