Description

This is my first foray into the wonderful flea-powered” world of single-ended triodes. The change came about as a result of a major event the birth of my son requiring the need for softer listening sessions without the sacrifice of dynamics.

My previous two-channel system was based around a Conrad-Johnson Premier 11A/B&W Nautilus 805 combination. It was a very rewarding pairing, but needed some volume to really sing. Given my room size (16’ x 13’ x 8.5’), I felt the “less is more” theory might be worth exploring.

After some hefty reading over on Audio Asylum and email exchanges with several inmates, I decided to take the plunge.

I contacted Jeff Korneff and had him build one of his 45-based single-ended amps. Its output is about 2 watts per channel of effortless sonic bliss. It’s extremely transparent and can deliver impressive dynamics given its minimal output.

Terry Cain, from Cain & Cain, built a pair of his Abbys (a modified Voight pipe design) for my “less is more” system. The Abby houses a single 6.5” Fostex full-range driver, and uses two interchangeable drivers for different listening experiences. A Fostex FE 166e driver is the more aggressive of the two, delivering a very forward presentation. The second of the two, a Fostex FF165K is a more laid-back, softer presentation. To paraphrase Terry Cain; the difference between these drivers is the deep and clear sound of the FF165k, as opposed to the dynamic projection of the FE166e. I like to think it’s the difference between sitting in the 10th row and being on stage with the musicians.

The room is equipped with two dedicated 20amp circuits - one to drive the source equipment and one for the amplification. Speakers are placed about 2 ½ feet from the rear wall and about 3.5' from the sidewalls. The chair is 10' from speakers, which are slightly toed-in.

I’ve found this system is capable of incredible detail retrieval and conveys the emotion of the music better than any other set-ups I’ve had in the room.
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Components Toggle details

    • Conrad Johnson Premier 17LS
    Gain: 26 dB
    Maximum Output: 15 V rms
    Hum and Noise: 100 dB below 2.5 V output
    Distortion at 1.0V output: less than .1% THD or IMD
    Phase: inverts phase of all inputs at main output
    Output impedance: less than 850 ohms
    Zero Negative Feedback

    The 17ls uses a 4ft BC-14G Cryo Power Cord
    • Jeff Korneff 45SE
    Class A Single Ended Triode, using 45 output tubes, a pair of 6SN7 drivers and a 5Z3 rectifier. The amp delivers 2WPC @ 8ohm with zero feedback. Materials used include:
    - Electroprint output transformers
    - Hammond 300 series power transformer
    - Elna Cerifine caps
    - WBT binding posts
    - Kimber RCA jacks
    All wiring is point-to-point.
    The 45SE uses a 4ft BC-14G Cryo Power Cord.
    • Cain & Cain Abby
    Modified Voight Pipe horn-loaded loudspeaker.
    Single Fostex FE166e driver with Fostex T90A super tweeter crossed over using Fostex CS 0.68 uF cap w/ 1ohm resistor in series and 30ohm resistor in parallel.
    • Sota Star Sapphire
    Self-Sensing Vacuum Hold-Down System w/ Remote Double-Regulated AC/Vacuum Pump. Balanced Sub-Chassis Hung from Four Point Spring Suspension. Rosewood Plinth. Vacuum/Motor assembly has been modified to include internal dampening sheets and an upgraded power cord.
    • Graham Engineering 2.2 Deluxe
    Unipivot Tonearm with micrometer adjustability for azimuth, VTA, and tracking force.
    • Lyra Helikon
    Output voltage: 0.5 mV Frequency range: 10 Hz – 50 kHz Stylus: 0.08 x 0.12 x 0.5 mm natural diamond shank, Ogura PA line-contact profile (3 x 30 um) Cantilever: 0.3mm diameter solid boron
    • Denon DL-103
    Back-up MC Cartridge Output voltage: 0.3mV Frequency response: 20Hz - 45kHz Output impedance: 40 ohms Needle: 16.5 micron round pin Tracking force: 2.5?0.2g Compliance: 5Õ0 -6 cm/dyne Weight: 8.5g
    • Sutherland Ph.D
    Two words... dead quiet!
    • Meridian 588
    Formats: CD Audio (CD-DA), CD-R, MP3
    Audio outputs: 1 coax. Digital SPDIF/IEC1937. 2-channel analogue output (unbalanced and balanced). Direct-coupled 192kHz/24-bit conversion.
    • Tascam DA-20mkII DAT
    n/a
    • JPS Labs Superconductor FX
    1m interconnect feeding the analog in and analog out on the Tascam DA-20mkII
    • Audience AU24 Phono Cable
    Custom built 1m DIN > RCA low output phono cable
    • Audience AU24 Interconnect
    1m single-ended IC between: 1) Merdian 588 CDP > CJ Premier 17ls 2) Acoustech PH-1 > CJ Premier 17ls 3) CJ Premier 17ls > Korneff 45SE
    • Audience AU24 Speaker Cable
    2m speaker cable terminated w/ Cardas silver plate spades.
    • Salamander Designs Twin 30
    n/a
    • Bright Star Audio IsoRock 4 Reference
    Turntable Isolation Platform. Twelve layer laminate of high-density polymer, multi-density composite board, polymer adhesives and non-resonant primer with six large IsoNode footers.
    • Audio Points Isolation Cones
    1" Brass isolation cones positioned under the CDP, DAT deck and phono stage
    • MonsterPower AVS-2000
    Voltage Stablizer
    • JPS Labs Digital AC
    Replaces stock power cord on the Meridian 588 CDP
    • Acme Audio Cryo Silver Plated Outlet (20A)
    Two cryogenicly treated 20A outlet residing on each own's 20A dedicated circut. One outlet feeds the power amp and one feed the source components (through the AVS-2000)
    • Homebrew BC-14G Cryo Power Cord
    Bob Crump designed power cord using Belden 19364 14-gauge wire, Wattgate 320i and 5266i connectors. All parts have been cryogenically treated.
    • Bybee Quantum Purifiers
    Internally mounted in series to the positive terminals in the Abby speakers (one per speaker)
    • Bottlehead SEX Headphone Amp
    Single-ended integrated/headphone amp

Comments 46

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Congratulations on your very nice sound system. I am just buyng Rethm Second speakers and Audiopax 88 monos--haven't received them yet. From all I've read about the sound of horn loaded speakers and SET's, I decided I had to hear them in my home. Will talk to you later after I've got some listening time in.

Just one technical question about your electrical supply--why a 20 amp circuit? Couldn't this prove dangerous to your equipment if more than 15 amps gets to a component? Friends who have more expertise than I, have recommended 20 amp circuits which I could implement easily but haven't done so because of this fear in the back of my mind.

Pleasurable listening,
Joe McQuade
[email protected]

Audiogon usier name "orfeo"

orfeo