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andyr's 'SkeletaLinn' / 12" Univector / Benz LP / AKSA / 'Frankenpans' System
IP Address: 101.181.183.128 Last Update: December 19, 2016 at 22:10:13
Amplifier: AKSA power amps for 3-way active tri-amping. Each side has:
* a 100w (into 8 ohms) 'Soraya' mono bloc driving the bass panel, and
* an 80w 'NAKSA 80' stereo PCB driving mids & ribbons.
Preamplifier (or None if Integrated): AKSA GK-2R remote-controlled, tube/ss hybrid pre-amp. With TKD stepped attenuator upgrade.
Speakers: Maggie IIIAs for 20 years. Replaced in mid 2010 with "Frankenpans" - a 'mongrel' Maggie which is, in effect, a IIIA which has the mid driver on a separate sheet of mylar to the bass driver.

This allows me to isolate the mid driver & ribbon from vibrations created by the bass driver ... and stops IM distortion happening, between bass & mid drivers.

Bass drivers came from some MG-2.5s; mids & ribbons came from a Tymp-IVa. Drivers are mounted in hardwood frames - 2 per side (1 for the bass driver; 1 for the mid & ribbon).

Each frame is mounted on its own 1.5" thick spiked plinth, which enables the frames to have different toe-ins. The mid/ribbon panels are currently angled to point at my knees, while the bass panels (which are on the inside) are almost flat to the wall.

Recently added 2x 15" Dayton 'Ultimax' subs and replaced the analogue active XO with a 10x10Hd miniDSP 4-way unit.
Sources:
CD Player/DAC: H-K CDR-20 for recording my LPs (for the car!).
Turntable/Phono Stage: 'SkeletaLinn' with 12" GoldenAge Audio Univector arm plus a 9" Magnepan Unitrac recently replaced a Linn LP12 with Khan top-plate/Lingo 2/Graham 2.2/Cetech CF-composite subchassis & armboard/custom Tasmanian Myrtle plinth.

Benz Ebony LP cartridge remains.

The SkeletaLinn uses the core LP12 components:
* 3 springs & grommets
* Cirkus bearing,
* inner/outer platters

... but has no top-plate or plinth. A triangular 'chassis' made from aluminium U-channel sits on the springs (which are under the corners of the triangle) and supports the bearing and the arms.

Power supply is from the new Oz TT mfr "Number9" - which can supply a variable AC voltage to a 24v Premotec AC motor (as used by Rega). The #9 TT PSU offers sophisticated power delivery capabilities:
* adjustment of mains HZ for 33 and 45rpm (to 3 decimal places).
* phase adjustment between the motor wire pairs - to minimise motor vibration (to 3 dp).
* voltage adjustment - both start-up and ongoing. Interestingly enough, raising the ongoing voltage to 30v (for a nominally 24v motor) substantially increased the SQ. The motor gets slightly warm at this voltage - but certainly not hot (the problem with supplying a higher voltage).
* individual control of 2 separate motors & belts - with a variable phase difference between the 2 motors.

My own 'Muse' battery powered, JFET-based, MC phono stage recently replaced a Bill Beard BBP100 discrete ss phono stage (with upgraded power supply).
Other Source(s): Sangean DAB+ digital/internet radio tuner.
Other Accessories/Room/Misc.:
Speaker Cables/Interconnects: Currently nothing special.

Some ICs from Allen Wright's (Vacuum State Electronics) "The Super Cable Cookbook". Each channel consist of 2 strands of XLO Teflon-insulated, solid-core Cu wrapped around a 4mm teflon tube ... kinda like a 'lightweight racing' XLO.
Other (Power Conditioner, Racks etc.): Nitty Gritty RCM.
DIY isolation platforms for phonostage and preamp. These consist of a 15kg slab of slate resting on 8 squash balls (see www.enjoythemusic.com for the basic idea).
Room Size (LxWxH): 12 ft x 19 ft x 9 ft
Room Comments/Treatments: A large cork painting on one of the long walls, to stop "slap echo".
Music Preferences and Comments:
Music Used (Genre/Selections): Baroque to Pink Floyd, Bob Marley and Jean Michel Jarre, opera and some jazz.
System Goals/Comments: IMO, superb vinyl reproduction ... going flat to 20Hz, with the recently-added subs.
System Strengths: Very coherent reproduction for small forces.
System Weaknesses: Soundstage depth - being worked on!
Video/HT System: None
Other Interests/Hobbies/Occupation: I make a great-sounding phono stage (the 'Muse') and some power treatment devices.

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