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  1. #151

    Re: VAC Signature iQ200

    Quote Originally Posted by knghifi View Post
    How many hours on KT150 before giving up?

    On my CAT JL7 and ARC REF250SE, KT150 new sounds harsh and 2D until ~50 hours before settling.
    Just the burn-in Upscale Audio does, which is 75 hours. True, that is not fair. But I've had a lot of tubes from new, and in my experience the initial character usually carries forward when I've run from new. In particular, I've had 4 or 5 new batches of KT120 over the past 10 years, and they always sound great from new. That said, it's possible the KT150 could be an exception. A small part of me was expecting immediate greatness, and those hopes were smashed The slam and bass of the KT150 is pretty prodigal, though. I'll say that much.

  2. #152
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    Re: VAC Signature iQ200

    Quote Originally Posted by mulveling View Post
    Just the burn-in Upscale Audio does, which is 75 hours. True, that is not fair. But I've had a lot of tubes from new, and in my experience the initial character usually carries forward when I've run from new. In particular, I've had 4 or 5 new batches of KT120 over the past 10 years, and they always sound great from new. That said, it's possible the KT150 could be an exception. A small part of me was expecting immediate greatness, and those hopes were smashed The slam and bass of the KT150 is pretty prodigal, though. I'll say that much.
    My ARC grade KT150 is also from Upscale and definitely needs time to settle or breaking in. It's a BIG tube!

    KT120 also sounds excellent in my amps but less powerful compare to KT150.

  3. #153
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    Re: VAC Signature iQ200

    Dear VAC-enthousiasts,

    Is there someone who ever tried to replace the standardfuses inside the VAC Signature IQ200 for other fuses? Currently here in theNetherlands there is quite a hype wrt the Synergistic Research Orange Fuses.

    Did someone already tried what happens when you exchange the standard fuse for a more audiophile one and if so,what is your experience?

    Thanks in advance.

    Best regards, Jan
    Jan

    Dedicated room: Confidence Mansion
    Electronics: Trinnov Altitude32 | VAC Signature 200 IQ mono’s | Parasound Halo JC-1’s + A51 | Synology DS918+/DX517 (48TB) | Oppo BDP-105D / UDP-203 CM Stufe2
    Speakers: Von Schweikert VR10-MKII system | Dynaudio Confidence C4 | Velodyne DD-18
    Projection: JVC DLA-RS55 | Stewart LX123HST13
    Various: Artesania Exoteryc 3L + Aire racks | Schnerzinger Emi + Giga Piccolo A3 | PS Audio Stellar Power Plant 3 | iPad Pro 12.9” (2018) | Roon
    Cables: AudioQuest Huricane EC | Nordost Frey speakercable | AudioQuest Diamond RJ/E | AudioQuest Diamond HDMI


  4. #154
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    Re: VAC Signature iQ200

    Quote Originally Posted by Jean Sibelius View Post
    Dear VAC-enthousiasts,

    Did someone already tried what happens when you exchange the standard fuse for a more audiophile one and if so,what is your experience?
    Just curious. So far nobody tried different fuses in de VAC Signature 200 IQ?
    Jan

    Dedicated room: Confidence Mansion
    Electronics: Trinnov Altitude32 | VAC Signature 200 IQ mono’s | Parasound Halo JC-1’s + A51 | Synology DS918+/DX517 (48TB) | Oppo BDP-105D / UDP-203 CM Stufe2
    Speakers: Von Schweikert VR10-MKII system | Dynaudio Confidence C4 | Velodyne DD-18
    Projection: JVC DLA-RS55 | Stewart LX123HST13
    Various: Artesania Exoteryc 3L + Aire racks | Schnerzinger Emi + Giga Piccolo A3 | PS Audio Stellar Power Plant 3 | iPad Pro 12.9” (2018) | Roon
    Cables: AudioQuest Huricane EC | Nordost Frey speakercable | AudioQuest Diamond RJ/E | AudioQuest Diamond HDMI


  5. #155
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    Re: VAC Signature iQ200

    I have not although I have wanted to. Why don’t you take one for the team.
    Larry


    Lumin U1
    Chord Dave Dac
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  6. #156
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    Re: VAC Signature iQ200

    I've wondered about this too.

    Question: on these amps (as well as on the Master preamp) the fuseholder has two fuses in it. Are these both active, or is one a spare? Anybody know?? I can't find anything in the owners manual about this.
    Rance


    Synology DS411+II | GigaFOILv4+Keces P3 Power Supply | Audioquest Diamond Ethernet | Lumin S1 | VAC Master Line Stage | VAC Signature 200 iQ amps | ARC REFERENCE 160M amps | JBL 4367+Isoacoustics Gaia I | SVS PC-4000 subs x 2 | Shunyata 6000T | Luminous Audio Technology cabling and power | Solid Tech racks | Vicoustics room treatments | ASC Iso-wall/Iso-ceiling construction

  7. #157
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    Re: VAC Signature iQ200

    Typically one is a spare.
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  8. #158
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    Re: VAC Signature iQ200

    Quote Originally Posted by joeinid View Post
    Typically one is a spare.
    Thanks Joe. That’s what I figured. I’m guessing the one clipped on is active, the one that is loosely slid in is the spare.


    Sent from my iPad using Tapatalk
    Rance


    Synology DS411+II | GigaFOILv4+Keces P3 Power Supply | Audioquest Diamond Ethernet | Lumin S1 | VAC Master Line Stage | VAC Signature 200 iQ amps | ARC REFERENCE 160M amps | JBL 4367+Isoacoustics Gaia I | SVS PC-4000 subs x 2 | Shunyata 6000T | Luminous Audio Technology cabling and power | Solid Tech racks | Vicoustics room treatments | ASC Iso-wall/Iso-ceiling construction

  9. #159
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    Re: VAC Signature iQ200

    Quote Originally Posted by Dguitarnut View Post
    I have not although I have wanted to. Why don’t you take one for the team.
    Hi Larry,

    Thanks for your proposal .

    I own a pair of Signature 200 IQ’s, so an alternative proposal would be that everybody who is interested in the outcome donates $10 (or more) to me until we reach the amount of 2 x $159 = $318 Dollars. Here in the Netherlands it are Euro’s by the way. Whatever happens I will clearly describe what the impact (or not) is of these fuses in these VAC’s. If I decide to keep the fuses I will refund the money to everyone. Fair deal?


    Just kidding… I contacted Kevin Hayes if he has an opinion on fuses in general. If he indicates that it could help, I will order 2 or 4(?) of these SR fuses and will test them in my system (and will provide my feedback here).

    All the best,

    Jan
    Jan

    Dedicated room: Confidence Mansion
    Electronics: Trinnov Altitude32 | VAC Signature 200 IQ mono’s | Parasound Halo JC-1’s + A51 | Synology DS918+/DX517 (48TB) | Oppo BDP-105D / UDP-203 CM Stufe2
    Speakers: Von Schweikert VR10-MKII system | Dynaudio Confidence C4 | Velodyne DD-18
    Projection: JVC DLA-RS55 | Stewart LX123HST13
    Various: Artesania Exoteryc 3L + Aire racks | Schnerzinger Emi + Giga Piccolo A3 | PS Audio Stellar Power Plant 3 | iPad Pro 12.9” (2018) | Roon
    Cables: AudioQuest Huricane EC | Nordost Frey speakercable | AudioQuest Diamond RJ/E | AudioQuest Diamond HDMI


  10. #160
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    Re: VAC Signature iQ200

    Ohhhhhhh NOOOOOO..........fuses respond different to European 220voltage......twice as many electrons run thru affecting ionic flux and diffraction of the superfluous subsonic frequency curves so I’m afraid we won’t be able to correlate the findings.
    Larry


    Lumin U1
    Chord Dave Dac
    Vac Master Preamp
    Vac 200IQ Amp
    Magico S3 Mk2 in Mcast Pewter
    Denali 6000S
    Ansuz and MIT cabling
    Timbernation walnut racks

  11. #161

    Re: VAC Signature iQ200

    My VAC Renaissance phono stage uses a fuse holder with a spare, so I'd expect the same on 200iQ's. I actually had to use the spare when a fuse blew after 7 months, and then blew again a few months later (only an issue on power-up). After consulting with Kevin, I bought replacement fuses at a higher rating - 3A vs. 2.5A. It's been flawless ever since. I reckon a hot voltage from the outlets around here (~ 125V) might have something to do with it.

    I'm at least somewhat interested in the Synergistic Research fuses, but haven't gone for any yet.

  12. #162
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    Re: VAC Signature iQ200

    In the meantime I received a response from Kevin, wherein he indicates that it can make a difference, but he also attached a picture of a fuse that was still conducting current whereas it should have not. It melted, but was still conducting.

    It was not clear which brand of fuse it was, but I decided to keep things as they currently are.
    Jan

    Dedicated room: Confidence Mansion
    Electronics: Trinnov Altitude32 | VAC Signature 200 IQ mono’s | Parasound Halo JC-1’s + A51 | Synology DS918+/DX517 (48TB) | Oppo BDP-105D / UDP-203 CM Stufe2
    Speakers: Von Schweikert VR10-MKII system | Dynaudio Confidence C4 | Velodyne DD-18
    Projection: JVC DLA-RS55 | Stewart LX123HST13
    Various: Artesania Exoteryc 3L + Aire racks | Schnerzinger Emi + Giga Piccolo A3 | PS Audio Stellar Power Plant 3 | iPad Pro 12.9” (2018) | Roon
    Cables: AudioQuest Huricane EC | Nordost Frey speakercable | AudioQuest Diamond RJ/E | AudioQuest Diamond HDMI


  13. #163
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    Re: VAC Signature iQ200

    They are going crazy over the VAC Statements on WTB. Some people love them. Some hate the mere concept of tubes. Has to be SS. I have been using a SET 845 amp for a while now. I miss some of what the KT PP sound presents. The SET is better with giving a true picture of instruments and vocals in the midband. It is more realistic. The KT PP gives better bass. Its complete and hits you like a kick drum would. Not just a poof and tone. I think the top end shimmer of say rivets in a crash are more pronounced in my PP amps. Not fully sure. I would have to reinsert them to tell.

    VAC has always been interesting to me. I have a demo Phi 160 for a short while. I though it to be a bit dry and unemotional. No obvious flaws. But it did not take me anywhere. I may have to listen to a signature one day.
    First Sound Mark3SI preamp, Altec Lansing 1570B modded by Transition Audio Design and myself, Mojo Audio CAT Server running Win Server 2016 AO HQ and Roon, Mojo Audio Mystic 3 DAC, Linear Solution Ethernet Switch, Custom TT with Vertere Arm, Denon 103R Midas with sapphire cantilever line contact diamond, Allnic H1201 phono pre, Pure Audio Project Trio 10 with performance Solen air core chokes and Mundord Supreme oil caps, Power via 10 awg OFC cord from panel to custom distribution strip, Inakustik speaker and interconnect cables, Genesis Interconnect.

  14. #164

    Re: VAC Signature iQ200

    Hope everything one is staying safe and healthy! I've few questions. It'd be really helpful if anyone can provide some insight.

    - How hot the 200IQ gets? I live in an smallish apartment in NYC. So excess heat is an issue in the summer. I'm planning to use 170IQ but can infer from 200IQ feedback here.
    - How much more power is achieved by swapping out the KT88 with KT120 or KT150?
    - My speaker is 84 dB Joseph Audio Perspective 2. It has a very easy impedance load that stays between 6-8 ohm. Any idea if VAC 170IQ is adequate for the Joseph? I do not need to play loud, 85-90 db loud MAX but mostly below 80/85 db. But I'm not sure if a low sensitive speaker still needs power to come alive even if you are not intending to play loud.

  15. #165
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    Re: VAC Signature iQ200

    Quote Originally Posted by Radiohead View Post
    Hope everything one is staying safe and healthy! I've few questions. It'd be really helpful if anyone can provide some insight.

    - How hot the 200IQ gets? I live in an smallish apartment in NYC. So excess heat is an issue in the summer. I'm planning to use 170IQ but can infer from 200IQ feedback here.
    - How much more power is achieved by swapping out the KT88 with KT120 or KT150?
    - My speaker is 86 dB Joseph Audio Perspective 2. It has a very easy impedance load that stays between 6-8 ohm. Any idea if VAC 170IQ is adequate for the Joseph? I do not need to play loud, 85-90 db loud MAX but mostly below 80/85 db. But I'm not sure if a low sensitive speaker still needs power to come alive even if you are not intending to play loud.
    1. It really isn’t too bad for heat - especially just one. You should be fine.
    2. Really no more power by swapping tubes.
    3. You shouldn’t have a challenge driving them with the 170 or 200.
    My Systems: http://www.audioshark.org/showthread...481#post158481

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  16. #166
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    Re: VAC Signature iQ200

    My IQ200 is in an east facing 11x14 room here in St Petersburg,Florida. It does get warmish during summer months but my overhead fan keeps me cool enough to not notice much. It’s my favorite piece of equipment and it’s a level above the excellent iq170 that I also auditioned which is the piece that made me fall in love with Vac tube gear. I also auditioned an Arc combo which to my ears didn’t have as relaxed of a sound as the iq170. The Mágicos I drive are also 86db and I never have had a ran out of juice problem.
    Larry


    Lumin U1
    Chord Dave Dac
    Vac Master Preamp
    Vac 200IQ Amp
    Magico S3 Mk2 in Mcast Pewter
    Denali 6000S
    Ansuz and MIT cabling
    Timbernation walnut racks

  17. #167
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    Re: VAC Signature iQ200

    Sorry double post
    Larry


    Lumin U1
    Chord Dave Dac
    Vac Master Preamp
    Vac 200IQ Amp
    Magico S3 Mk2 in Mcast Pewter
    Denali 6000S
    Ansuz and MIT cabling
    Timbernation walnut racks

  18. #168

    Re: VAC Signature iQ200

    So this weekend I went back to trying the original Gold Lion KT88 in my 200 iQ monos (having run Tung Sol KT120 for a long time) and have to say I really really enjoyed it. This may very well be the preference going forward. My monos are probably finally fully burned in now, since receiving them 6 months ago (I don’t do burn in other than my listening), plus other slight system tweaks, so maybe that had something to do with it. But also I tried KT150 again and have to say those are still just awful in my system. Dark and dead up top. Not even close to the KT88 and KT120 here.

    In general I’m still super impressed by these amps. I tried my old Rogue Apollo Darks again too, and there’s just no comparison. The VACs are worth the high chunk of money!

  19. #169
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    Re: VAC Signature iQ200

    Quote Originally Posted by mulveling View Post
    So this weekend I went back to trying the original Gold Lion KT88 in my 200 iQ monos (having run Tung Sol KT120 for a long time) and have to say I really really enjoyed it. This may very well be the preference going forward. My monos are probably finally fully burned in now, since receiving them 6 months ago (I don’t do burn in other than my listening), plus other slight system tweaks, so maybe that had something to do with it. But also I tried KT150 again and have to say those are still just awful in my system. Dark and dead up top. Not even close to the KT88 and KT120 here.

    In general I’m still super impressed by these amps. I tried my old Rogue Apollo Darks again too, and there’s just no comparison. The VACs are worth the high chunk of money!
    Not surprised you went back to the stock tubes. They are really good. Only my 1960’s GoldLion KT88’s beat them.

    No surprise on the Rogue either. The VAC is just top stuff. I love watching them being made. Serious hand made workmanship. When they’re putting together a Statement piece (takes MANY months), I just watch the progress in awe. Love the point to point wiring.


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