Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2... - Page 4
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  1. #31
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    I am using the Krell 403E amp which has both XLR and RCA connections. I failed to mention that this hum/static was also present when I switch to RCA connections on my old Krell Phantom pre but plays fine with XLR connections.

    Joe I’ll try securing the RCA as suggested. Thank you.

  2. #32
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    If I had hum/static, it was ALWAYS from locking connector RCAs. I hope that's what is going on here.
    Joe

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  3. #33
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    If the Krell is a fully balanced amp then you may be running into the same issue as Fremer ran into when he tried to run the fully balanced BHK amps with the SE Dart preamp. His only solution was to lift the ground on the amp end. The same thing was happening when you ran SE interconnects with the two Krell pieces.
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  5. #34
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    Something else to think about, with Conrad Johnson, everything should be run from one circuit to minimize any chance of mismatched grounds.
    Joe

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  6. #35
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    @ Jack Thanks for chiming in. Can you explain lifting the ground.

    I moved the router and modem further away from the preamp and Dac; Im still getting the static hum with only the PAcific Dac and hum is present whether the Pacific is ON or OFF and independent of of source selection and volume.

  7. #36
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    Quote Originally Posted by Jack View Post
    If the Krell is a fully balanced amp then you may be running into the same issue as Fremer ran into when he tried to run the fully balanced BHK amps with the SE Dart preamp. His only solution was to lift the ground on the amp end. The same thing was happening when you ran SE interconnects with the two Krell pieces.
    Excellent information, Jack. Unfortunately the single-ended connections are an afterthought on a lot of amps these days. C-J and some other companies still do it right.

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  8. #37
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    If unplugging the Lampi from the preamp eliminates the hum then as an interim measure you can try using a cheater plug on each of the three pieces one at a time and see if lifting the ground on one of them eliminates the hum. Are they all connected to the same circuit or conditioner?
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  9. #38
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    Can you recommend a cheater plug to use? Will the addition of a cheater plug have any effect on sound. Is there a permanent fix?

    All the main components are connected into a single power conditioner and the powerconditioner is plugged into a dedicated furutech duplex; nothing else is plugged into the second outlet on the duplex.

  10. #39
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    UL Listed 3-Prong to 2-Prong Adapter Grounding Converter - JACKYLED 3-Prong Adapter Converter Fireproof Material 200℃ Resistant Heavy Duty for Wall Outlets Household 2-Pack

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    Joe

    Avantgarde Duo XD, Klipsch RB-75, Klipsch RP-160M, JBL 590.

    Job INTegrated, Naim Supernait 2 w/ HiCap-DR.

    Conrad Johnson GAT2, Wyred 4 Sound STP-SE Stage 2, Misho Myronov Wooden pre.

    Misho Myronov Wooden amp, First Watt SIT-3 (X2 - one as backup), Job 250 Monos, Valvet E2se, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos.

    Lumin U1 mini, ModWright Ultimate Sony XA-5400ES, Audio Mirror Tubadour III NOS R2R Tube Dac w/ upgrades.

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  11. #40
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    Re: Roy Gregory Compares ARC Ref 10, VTL 7.5 Series III, and CJ GAT Series 2...

    For the purpose of testing a cheater plug is a cheater plug and they can be picked up at any hardware store and even at most "dollar" stores for less than a buck. They have no effect on the sound except to eliminate a ground loop if you have one. If your line conditioner has a ground lug then just try running a wire from the Lampi to the Line Conditioner if the cheater plug solves the problem. If the system is all plugged into the Line Conditioner which is grounded then lifting the ground on the Lampi is not an issue anyway.
    Main - JVC QL-Y7/Denon DL-301 Mk II, Gold Note PH-10, Nuprime CDT-8, Auralic Aries G1, Aqua La Voce S3, Supratek Chardonnay, Van Alstine Vision SET 400, Reynaud Abcisse Jubilee, (2) Rythmik F12SE, Audio Envy IC's , Triode Wire Lab PC's & SC's, PS Audio Stellar P3, PI Audio Uberbuss, Timbernation rack

    Family Room - Oppo UDP-203, Teac NT-505, Audia Flight FL Three S, Nola KO, (2) Rythmik F-12G, Audio Sensibility SC & IC's, Neotech PC's, SurgeX SA-1810

 

 
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