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| Headphone Amps (full-size) Discussion of desktop headphone amps. |
05-16-2007, 11:53 AM
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100+ Head-Fi'er
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Join Date: Jan 2007
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[QUOTE=chris_ah1;2957533]gotta say that's looking a lot like it could be a four channel system 
QUOTE]
Please bear with my ignorance. What is a four channel system or a 3 channel system as mentioned by Skylab? I thought that audio has only 2 channels: L and R. What are the usages of the 3rd and 4th channels?
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05-16-2007, 01:04 PM
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Headphoneus Supremus:
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Join Date: Apr 2005
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Well if a woody is actually in the cards for the production units, Remitrom, sign me up for THAT! 
__________________
PLEASE NOTE: Due to the volume of PM's I have been receiving in connection with my reviews, I no longer have the time to answer PM's from people with zero posts. Please read head-fi first before asking questions.
Team GO-U-NORTHWESTERN
Pics: Main Home Rig; Bedside Rig; Office Rig; Portable Rig;
Headphones: JVC HP-DX1000, HA-RX900; Headphile Deep Cup Darth Beyers VXD3,VXD4; Beyerdynamic DT990/600 (Manufaktur) DT770/600 (Manufaktur), DT880/600 Balanced (Manufaktur); HiFi-Man HE-2 Planar Magnetic; Sennheiser PXC-350; Shure SRH840
Home amps: Ray Samuels Audio Stealth (Mullard ECC32/CV4003); Decware Zen CSP-2 (Amperex BB 6DJ8/Sophia Princess 274B); Darkvoice 337 (GEC 6AS7G's/Tung-Sol mesh plate 6SJ7GTs); Wheatfield Audio HA-2 (Mullard ECC32/GEC 6AS7G/GEC U52); Ming-Da MC84-C 07 (Mullard CV4004/EL84/EM87); Audiotailor Jade (GEC 6AS7G/Sylvania 5751); J. Sound Lab Headphone (Mullard 12AT7); Audio-GD Phoenix; Musical Paradise MP-301 (Ken-Rad 6V6GT/Mullard 6AU6)
Portable Amps: Ray Samuels Audio P-51 Mustang; Decware ZenHead; Meier Audio 2Move, XXS; Qables iQube
Sources: Denon DP59L table + Clearaudio Maestro Wood / VPI Scoutmaster + Benz Micro Wood L2 > Audio Electronics PH-1 DJH Phono Preamp; Music Hall 25.2 DAC; Denon DVD-5900;Red Wine Audio iMod iPod (Apple Lossless) & ALO VCap dock; Sony SCD-555ES SACD player
Loudspeaker system: Krell KAV250 Preamp>Sunfire Signature II Power amp > B&W Nautilus 800 Signatures + Velodyne FSR-1500/Martin Logan Descent
Tube testers: B&K Dyna-quick 650 & Dyna-Jet 606
Head-fi feedback
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05-16-2007, 01:08 PM
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500+ Head-Fi'er
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Join Date: Mar 2006
Location: Penang, Malaysia.
Posts: 866
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[QUOTE=GreenLeo;2959761]
Quote:
Originally Posted by chris_ah1
gotta say that's looking a lot like it could be a four channel system
QUOTE]
Please bear with my ignorance. What is a four channel system or a 3 channel system as mentioned by Skylab? I thought that audio has only 2 channels: L and R. What are the usages of the 3rd and 4th channels? |
there are only 3 channels for traditional single ended setup with active ground.
4 channel usually means it's balanced because it amplifies the inverted and non inverted signal (differential output).
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05-16-2007, 02:29 PM
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Headphoneus Supremus:
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OK, I have added some additional comments, and have essentially completed my review. This is going to be a great amp. I hope it isn't TOO expensive, as I think a lot of people would enjoy it.
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PLEASE NOTE: Due to the volume of PM's I have been receiving in connection with my reviews, I no longer have the time to answer PM's from people with zero posts. Please read head-fi first before asking questions.
Team GO-U-NORTHWESTERN
Pics: Main Home Rig; Bedside Rig; Office Rig; Portable Rig;
Headphones: JVC HP-DX1000, HA-RX900; Headphile Deep Cup Darth Beyers VXD3,VXD4; Beyerdynamic DT990/600 (Manufaktur) DT770/600 (Manufaktur), DT880/600 Balanced (Manufaktur); HiFi-Man HE-2 Planar Magnetic; Sennheiser PXC-350; Shure SRH840
Home amps: Ray Samuels Audio Stealth (Mullard ECC32/CV4003); Decware Zen CSP-2 (Amperex BB 6DJ8/Sophia Princess 274B); Darkvoice 337 (GEC 6AS7G's/Tung-Sol mesh plate 6SJ7GTs); Wheatfield Audio HA-2 (Mullard ECC32/GEC 6AS7G/GEC U52); Ming-Da MC84-C 07 (Mullard CV4004/EL84/EM87); Audiotailor Jade (GEC 6AS7G/Sylvania 5751); J. Sound Lab Headphone (Mullard 12AT7); Audio-GD Phoenix; Musical Paradise MP-301 (Ken-Rad 6V6GT/Mullard 6AU6)
Portable Amps: Ray Samuels Audio P-51 Mustang; Decware ZenHead; Meier Audio 2Move, XXS; Qables iQube
Sources: Denon DP59L table + Clearaudio Maestro Wood / VPI Scoutmaster + Benz Micro Wood L2 > Audio Electronics PH-1 DJH Phono Preamp; Music Hall 25.2 DAC; Denon DVD-5900;Red Wine Audio iMod iPod (Apple Lossless) & ALO VCap dock; Sony SCD-555ES SACD player
Loudspeaker system: Krell KAV250 Preamp>Sunfire Signature II Power amp > B&W Nautilus 800 Signatures + Velodyne FSR-1500/Martin Logan Descent
Tube testers: B&K Dyna-quick 650 & Dyna-Jet 606
Head-fi feedback
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05-16-2007, 03:29 PM
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Headphoneus Supremus
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Join Date: Mar 2007
Location: NJ
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Awesome. Can't wait to see and hear a finished product!
GAD
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05-16-2007, 04:27 PM
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Headphoneus Supremus
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Join Date: Aug 2006
Location: In Sunny NE Florida
Posts: 3,347
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Dammit. My only Gripe with the PRII was that the headphone jack(s) are on the back...WTF???? Why can't people put them on the front!!!! it makes carrying it around so damn awkward (on it's side).
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05-16-2007, 10:11 PM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: San Jose/Sacramento
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hey skylab, how does this compare to a PPA2 with bass adjust? (does the PPA2 also give a wide range of bass adjustment?)
but omggggg, i want this too! any estimates on how much it will cost?
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Denon AH-D2000 ///Audioengine A5B /// Sennheiser HD25-1 II /// KOSS KSC-35
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05-16-2007, 10:19 PM
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Headphoneus Supremus:
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I'm sorry, I don't know on either front 
__________________
PLEASE NOTE: Due to the volume of PM's I have been receiving in connection with my reviews, I no longer have the time to answer PM's from people with zero posts. Please read head-fi first before asking questions.
Team GO-U-NORTHWESTERN
Pics: Main Home Rig; Bedside Rig; Office Rig; Portable Rig;
Headphones: JVC HP-DX1000, HA-RX900; Headphile Deep Cup Darth Beyers VXD3,VXD4; Beyerdynamic DT990/600 (Manufaktur) DT770/600 (Manufaktur), DT880/600 Balanced (Manufaktur); HiFi-Man HE-2 Planar Magnetic; Sennheiser PXC-350; Shure SRH840
Home amps: Ray Samuels Audio Stealth (Mullard ECC32/CV4003); Decware Zen CSP-2 (Amperex BB 6DJ8/Sophia Princess 274B); Darkvoice 337 (GEC 6AS7G's/Tung-Sol mesh plate 6SJ7GTs); Wheatfield Audio HA-2 (Mullard ECC32/GEC 6AS7G/GEC U52); Ming-Da MC84-C 07 (Mullard CV4004/EL84/EM87); Audiotailor Jade (GEC 6AS7G/Sylvania 5751); J. Sound Lab Headphone (Mullard 12AT7); Audio-GD Phoenix; Musical Paradise MP-301 (Ken-Rad 6V6GT/Mullard 6AU6)
Portable Amps: Ray Samuels Audio P-51 Mustang; Decware ZenHead; Meier Audio 2Move, XXS; Qables iQube
Sources: Denon DP59L table + Clearaudio Maestro Wood / VPI Scoutmaster + Benz Micro Wood L2 > Audio Electronics PH-1 DJH Phono Preamp; Music Hall 25.2 DAC; Denon DVD-5900;Red Wine Audio iMod iPod (Apple Lossless) & ALO VCap dock; Sony SCD-555ES SACD player
Loudspeaker system: Krell KAV250 Preamp>Sunfire Signature II Power amp > B&W Nautilus 800 Signatures + Velodyne FSR-1500/Martin Logan Descent
Tube testers: B&K Dyna-quick 650 & Dyna-Jet 606
Head-fi feedback
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05-16-2007, 11:01 PM
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Headphoneus Supremus
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Join Date: Nov 2006
Location: China
Posts: 1,678
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Great review Skylab.
So did you test this with 600 ohms and did it have the desired punch? Did you specifically get to try your DT880/600s? You said it's a bit warm which sounds promising!
__________________
Portable: iPhone 3GS > UE Triple-Fi 10 Pro (Westone cable)
Movies: Pioneer DVR-550H > Denko ETPC interconnect > Millet Hybrid (diamond buffers) > Darth Beyer V3 (Wenge Blackmax)
Home: Thinkpad T60 (Maxtor external HDD, Foobar) > USB Monica > Headphile Blackmax interconnect > Earmax Pro (1949 Valvo ECC81 coin base + matched 1965 Philips E188CC) > Beyer DT880 (600 ohm)
(Other favourite gear: Headroom MicroDAC, Meier Headsix, iPod Video 30GB, iRiver iFP-799, Sony D77 eggos)
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05-16-2007, 11:33 PM
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Headphoneus Supremus:
Reviewerus Prolificus
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Join Date: Apr 2005
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It performed well with the DT880/600's - very well.
__________________
PLEASE NOTE: Due to the volume of PM's I have been receiving in connection with my reviews, I no longer have the time to answer PM's from people with zero posts. Please read head-fi first before asking questions.
Team GO-U-NORTHWESTERN
Pics: Main Home Rig; Bedside Rig; Office Rig; Portable Rig;
Headphones: JVC HP-DX1000, HA-RX900; Headphile Deep Cup Darth Beyers VXD3,VXD4; Beyerdynamic DT990/600 (Manufaktur) DT770/600 (Manufaktur), DT880/600 Balanced (Manufaktur); HiFi-Man HE-2 Planar Magnetic; Sennheiser PXC-350; Shure SRH840
Home amps: Ray Samuels Audio Stealth (Mullard ECC32/CV4003); Decware Zen CSP-2 (Amperex BB 6DJ8/Sophia Princess 274B); Darkvoice 337 (GEC 6AS7G's/Tung-Sol mesh plate 6SJ7GTs); Wheatfield Audio HA-2 (Mullard ECC32/GEC 6AS7G/GEC U52); Ming-Da MC84-C 07 (Mullard CV4004/EL84/EM87); Audiotailor Jade (GEC 6AS7G/Sylvania 5751); J. Sound Lab Headphone (Mullard 12AT7); Audio-GD Phoenix; Musical Paradise MP-301 (Ken-Rad 6V6GT/Mullard 6AU6)
Portable Amps: Ray Samuels Audio P-51 Mustang; Decware ZenHead; Meier Audio 2Move, XXS; Qables iQube
Sources: Denon DP59L table + Clearaudio Maestro Wood / VPI Scoutmaster + Benz Micro Wood L2 > Audio Electronics PH-1 DJH Phono Preamp; Music Hall 25.2 DAC; Denon DVD-5900;Red Wine Audio iMod iPod (Apple Lossless) & ALO VCap dock; Sony SCD-555ES SACD player
Loudspeaker system: Krell KAV250 Preamp>Sunfire Signature II Power amp > B&W Nautilus 800 Signatures + Velodyne FSR-1500/Martin Logan Descent
Tube testers: B&K Dyna-quick 650 & Dyna-Jet 606
Head-fi feedback
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05-16-2007, 11:35 PM
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Headphoneus Supremus
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Join Date: Apr 2005
Location: Redneck in a Blue State
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Nice write-up Skylab! Sounds like a promising amp indeed... I'll have to pick one up... I'm always looking for more bass   I hope Phil does produce a version that uses Li-Ion battery and a gain switch... that would really add value IMO, especially given the direction portable and transportable amps are moving.
Any idea if one could roll some AD797's in there? Have you compared it to the new TTVJ Millet Hybrid yet? Despite the background noise issue I had with that amp its sound was pretty damn impressive IMO.
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05-16-2007, 11:39 PM
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Headphoneus Supremus:
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I believe the commercial version will feature a charging circuit. Not sure about op-amp rolling, nor have I had the chance to listen to the portable millet hybrid
__________________
PLEASE NOTE: Due to the volume of PM's I have been receiving in connection with my reviews, I no longer have the time to answer PM's from people with zero posts. Please read head-fi first before asking questions.
Team GO-U-NORTHWESTERN
Pics: Main Home Rig; Bedside Rig; Office Rig; Portable Rig;
Headphones: JVC HP-DX1000, HA-RX900; Headphile Deep Cup Darth Beyers VXD3,VXD4; Beyerdynamic DT990/600 (Manufaktur) DT770/600 (Manufaktur), DT880/600 Balanced (Manufaktur); HiFi-Man HE-2 Planar Magnetic; Sennheiser PXC-350; Shure SRH840
Home amps: Ray Samuels Audio Stealth (Mullard ECC32/CV4003); Decware Zen CSP-2 (Amperex BB 6DJ8/Sophia Princess 274B); Darkvoice 337 (GEC 6AS7G's/Tung-Sol mesh plate 6SJ7GTs); Wheatfield Audio HA-2 (Mullard ECC32/GEC 6AS7G/GEC U52); Ming-Da MC84-C 07 (Mullard CV4004/EL84/EM87); Audiotailor Jade (GEC 6AS7G/Sylvania 5751); J. Sound Lab Headphone (Mullard 12AT7); Audio-GD Phoenix; Musical Paradise MP-301 (Ken-Rad 6V6GT/Mullard 6AU6)
Portable Amps: Ray Samuels Audio P-51 Mustang; Decware ZenHead; Meier Audio 2Move, XXS; Qables iQube
Sources: Denon DP59L table + Clearaudio Maestro Wood / VPI Scoutmaster + Benz Micro Wood L2 > Audio Electronics PH-1 DJH Phono Preamp; Music Hall 25.2 DAC; Denon DVD-5900;Red Wine Audio iMod iPod (Apple Lossless) & ALO VCap dock; Sony SCD-555ES SACD player
Loudspeaker system: Krell KAV250 Preamp>Sunfire Signature II Power amp > B&W Nautilus 800 Signatures + Velodyne FSR-1500/Martin Logan Descent
Tube testers: B&K Dyna-quick 650 & Dyna-Jet 606
Head-fi feedback
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05-17-2007, 02:01 AM
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Headphoneus Supremus
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Join Date: Jul 2005
Location: Miami Beach, Florida
Posts: 16,016
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Quote:
Originally Posted by Loftprojection
I'm also VERY happy that it's not designed to be a small portable. I love the fact that he has RCA input and 1/8 plug. There are plenty of small portable amps out there but there are not many "transportable battery" amps. There is nothing more fun then being able to go from one room to the other in the house without wire headaches, or in summer, go in the garden sit on a chair and listen to music out of you imod into a battery amp. No messing around with long AC extension. 
I think this amp might be a genious design if sound quality is there to match or better the very few others in its niche (RSA XP-7, Rudi NKK01, HeadRoom Micro,...). |
But he will have two versions. If that is so then one can be a transportable and the other a portable. That is what I was alluding to.
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05-17-2007, 02:53 AM
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Headphoneus Supremus
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Join Date: Aug 2006
Location: In Sunny NE Florida
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Quote:
Originally Posted by wakeride74
Nice write-up Skylab! Sounds like a promising amp indeed... I'll have to pick one up... I'm always looking for more bass I hope Phil does produce a version that uses Li-Ion battery and a gain switch... that would really add value IMO, especially given the direction portable and transportable amps are moving.
Any idea if one could roll some AD797's in there? Have you compared it to the new TTVJ Millet Hybrid yet? Despite the background noise issue I had with that amp its sound was pretty damn impressive IMO. |
I thought the Millet was a letdown...good amp, but I just don't think it was my cup of tea, and I LOVE tubes of all variety. The only thing I liked about it was the WIDE soundstage.
Hmm...if this thing is that much better than the PRII...same sound, attack, and bass characteristics...it's a sure bet. But I also said that about the TTVJ. So I'll have to have a listen.
Excited.
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05-17-2007, 04:47 AM
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Headphoneus Supremus
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Join Date: Apr 2006
Location: Sydney, Australia
Posts: 2,697
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Quote:
Originally Posted by wakeride74
Any idea if one could roll some AD797's in there? Have you compared it to the new TTVJ Millet Hybrid yet? Despite the background noise issue I had with that amp its sound was pretty damn impressive IMO.
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iirc phil said that the circuit was designed especially for this opamp, as he's not using a traditional pinout, but is bypassing the internal buffer by using the comp output
so swapping opamps isn't a matter of dropping a new one in, you'd need to re-wire the opamp pins
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