DaVa FC-A1 a field coil contender
- Thread starter christensenleif@msn.com
- Start date
I do exactly the same as Leif does for grounding here. Again no connection between dc and ground.
Some more things to check. Is the arm base electrically coupled to that ground connector on the turntable I see?
Are you using an LFD arm cable? That has 2 grounds. Try experimenting with both and the either one separately.
Are you using an LFD arm cable? That has 2 grounds. Try experimenting with both and the either one separately.
I think Lief has the best advice for fixing the hum problem. In my system, I am running the regular DaVa and the DaVa SUT, same as Bill. I also have no connection between DC and ground. I do have my SUT grounded to my AS Phonolab phono, and from there run a ground wire to the star ground point of the entire system. My current DaVa tube psu is very silent and isn't grounded in any way.
i'm busy at work for a few hours, and will respond later. thank you everyone for the advice and coaching.
took a break.
my baseball team, the Mariners, have now won 13 straight, and 18 of 21 games, played Friday night and Saturday (exciting games, won both), then there is the British Open at St. Andrews, the Tour de France, my soccer team the Sounders, and my daughter and son in law visited yesterday and stayed late.which are all excuses to keep me from doing what i most avoid, trouble shooting hum and noise. sigh.
this morning trying to gather myself for the push......need to re-read all the coaching tips.....
hi Leif,
stepped aside for 3 weeks, had some life activities and an audio show intrude and needed to get my attitude right, this past weekend dived back in and did try some grounding from the cartridge screw to the PSU (no lowering of noise) and to the EMIA phono (slight lowering of noise); need to send Darius some pictures. Dave Slagle might send me a 1:40 SUT (verses my 1:28)to try. so baby steps forward.
the question is how much is the grounding the issue, verses the SUT gain? and then how to actually attach the ground to the various spots with my feeble DIY skills? so the pictures will help Darius to coach me. need to drag my Marco lens out to get some good pictures of the tiny spots. also; bought some silver 26 gauge wire for the grounding, need to source much finer wire that i can attach to the arm wand that won't be as heavy and stiff.
cheers,
Mike
Last edited:
OK
my best bet is try unwinding dc cable around armwand
just tape it parallell with wand...
I have no separate cart or psu gnd to riaa or anywhere else and have zero noise in 112db sensitive horn system
best
Leif
my best bet is try unwinding dc cable around armwand
just tape it parallell with wand...
I have no separate cart or psu gnd to riaa or anywhere else and have zero noise in 112db sensitive horn system
best
Leif
Please unwind dc cable from armwand, use carbontube for the dc cables
2.5mm diameter weight under 1.4gramm (one feet). fix it with tape on the armwand.
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grounding only turntable and tonearm to the phonoamp not the sut.
multiple grounding results in mostly hum grinding. please do not use halogen lamps nearby
i'm told my problem is a carbon fiber arm wand does not allow any grounding. so i have to provide some.
pls unwind dc cable anyway...it acts as coil outside signal cables
I gnd everything; arm, signal cable and SUT directly to riaa...NOT arm cable to SUT!
I gnd everything; arm, signal cable and SUT directly to riaa...NOT arm cable to SUT!
ok, some progress, got a pair of single channel copper 1:40 SUT's from Dave and this has taken me to a better spot. i'm now hearing some amazingly explosive, detailed and very 'live' sounding music from the DaVa. the bass is extraordinary. and the noise issue is lessened.
very encouraged.
next going to work on re-doing the dc and ground wires running straight on top of the arm tube. maybe O ring and tape idea. need to find thin ground wire somewhere.
very encouraged.
next going to work on re-doing the dc and ground wires running straight on top of the arm tube. maybe O ring and tape idea. need to find thin ground wire somewhere.
ok, some progress, got a pair of single channel copper 1:40 SUT's from Dave and this has taken me to a better spot. i'm now hearing some amazingly explosive, detailed and very 'live' sounding music from the DaVa. the bass is extraordinary. and the noise issue is lessened.
very encouraged.
next going to work on re-doing the dc and ground wires running straight on top of the arm tube. maybe O ring and tape idea. need to find thin ground wire somewhere.
Mike - out of interest do you have another arm in your collection with non carbon shaft to prove whether it is the shaft causing the issue or whether it is something else. I use a wood headshell so would in theory have similar problem yet mine is deadly silent with my horns too (like Leif). With the cap filtration I would say quietest noise floor I have ever had with any cart.
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