Welcome to Mapletree Audio Design

• Fast, fast service! This is the quietest time of the year for orders so if you want to avoid the 1-2 month lead time experienced last fall, I urge you to consider an order now.

• Free interconnect with preamp orders this month. Monster Cable Interlink 101XLN stereo interconnect. 1 m (3.3 ft). While supplies last.

• The new Ear+ HD Super Headphone Amplifier is in production! Based on experience with the high-voltage power supply of the HD200 Special Edition, the new HD Super offers 3 times the available power output plus the benefits of soft-start tube rectification. It will drive two or more sets of headphones simultaneously. Other specs and features are the same as the Ear+ HD including dual inputs and passive output. A Black Gate filter capacitor for the driver stage plate supply is standard. Options include an all-Black Gate power supply ($60), locking Neutrik headphones jacks (shown-$30), and a DACT stepped attenuator ($230). Chassis is 12" x 8" with rock maple side panels. Introductory price is $850.

The Ear+ HD, including the kit version, will continue as the flagship headphone amplifier.

• New styling with polished aluminum or black front panels and 3/4" maple sides (ebonized or stained) will now be standard on all Mapletree products. Additional new colors are sage green (shown) and cobalt blue. Silver face Line 2A SE with PS 2and black face Ear+ HD shown below.

Vacuum Tube Sound for the 21^st Century Mapletree Audio Design offers a unique range of products designed and hand crafted by Dr. Lloyd Peppard, a retired electronics engineering professor. The goal is to increase your enjoyment of recorded music through the use of vacuum tube amplification and signal processing.
Click on tubes for more information!
Customer Photos of the Month Murray Smith (New Zealand): Mapletree forest! Vinyl: Project RPM 10 table and arm Cartridge, MC Dynavector 20X. CD: Esoteric SA-60. Pre amp. MAD Ultra 4A SE with PS2 power supply. Thingy high-level crossover/ambience recovery. High frequency: 2 x Super Stealth monoblocks, Low frequency: 2 x Super Stealth monoblocks, all with user-designed stainless steel cages. Ambience (rear) channels: 2 x Antique Audio 20 watt mono blocks. Speakers: Chairo Constellation Majors, front main channels. Subwoofer: B&W AWS 750 (12"). Ambience speakers (in wall): B&W x 4, switchable from Crossover. Interconnects: Anticables. Speaker cables: Anticables, (solid copper) 1m long. Kostis Papadakis (Greece). SR 70 driver board in refurbished Dynaco ST 70: "My Dynaco now is one of the best tube amplifiers I' ve ever heard, without spending a fortune". July News and Specials • Fast, fast service! This is the quietest time of the year for orders so if you want to avoid the 1-2 month lead time experienced last fall, I urge you to consider an order now. • Free interconnect with preamp orders this month. Monster Cable Interlink 101XLN stereo interconnect. 1 m (3.3 ft). While supplies last. • The new Ear+ HD Super Headphone Amplifier is in production! Based on experience with the high-voltage power supply of the HD200 Special Edition, the new HD Super offers 3 times the available power output plus the benefits of soft-start tube rectification. It will drive two or more sets of headphones simultaneously. Other specs and features are the same as the Ear+ HD including dual inputs and passive output. A Black Gate filter capacitor for the driver stage plate supply is standard. Options include an all-Black Gate power supply ($60), locking Neutrik headphones jacks (shown-$30), and a DACT stepped attenuator ($230). Chassis is 12" x 8" with rock maple side panels. Introductory price is $850. The Ear+ HD, including the kit version, will continue as the flagship headphone amplifier. • New styling with polished aluminum or black front panels and 3/4" maple sides (ebonized or stained) will now be standard on all Mapletree products. Additional new colors are sage green (shown) and cobalt blue. Silver face Line 2A SE with PS 2and black face Ear+ HD shown below.

Mapletree Audio Design Product Overview
**Go to: Preamps • Headphone Amps • Power amps •** Other products NOTE: All MAD components, with the exception of the Super Stealth power amplifiers, are available for 230-240 VAC 50 Hz at no extra cost. Super Stealth monoblocs for 230-240 VAC are available at a slightly higher price. Chassis colors include RCA Red, textured black, Sylvania Yellow, British Racing Green, and eggshell white. Solid wood side panels are finished in ebonized black or natural red oak.
Preamplifiers
*Line 2A SE Line Preamplifier (kit and assmebled)* Review of Line 2A SE by John Hoffman in Affordable Audio July/07 issue Review of Line 2 by Chris Thompson on Head-Fi • Line 2A SE Preamp wins "Affordable$$Audio 2007 Big Bang, Little Bucks Award". See the January Issue of Affordable$$Audio (www.affordableaudio.org). • Premium passive components include Auricap coupling capacitors. • Optimized circuitry for lowest distortion and noise. • 3 inputs, 2 outputs, volume and individual channel level controls. • 2 x 12SN7GT with switch for 6SN7GT tubes. • Separate PS 2 power supply (with 6X5GT tube/HEXFRED hybrid rectification) included. More Information • Customer Comments

*Phono 4 SE Phono Preamplifier* Offered for those desiring a phono preamp without the line input and control features of the Ultra 4A SE (see below). Front panel gain control with up to 50 dB gain. Can feed a power amp directly or recorder/computer input (for CD-R) or can be combined with a line preamp for additional gain. Two switchable inputs (rear panel) can have different load resistance and capacitance if desired. The circuit is identical to the Ultra 4A SE with Auricap capacitors used throughout. Also includes two outputs and a heater voltage switch for use of 6SN7GT or 12SN7GT tubes in the output stages. Includes the separate PS 2 power supply. Customer feedback • More information
*Ultra 4A SE Phono/Line Preamplifier* "MAD [Ultra 4] is my vote for best bang for the buck, heck maybe even best product contention at any reasonable price". NEW! *Customer Review of Ultra 4A and Ear+ Purist* *Reviewof Ultra 4A by Pat McDemott on Audio Asylum* *Review of Ultea 4A SE by JR Cody on audioweb.com* *Reviewof Ultra 4A by Scott Faller* (*TNT-Audio) Reviewof the Ultra 4 by Tom Mitchell on AudioCircle* <> • Premium passive components include Auricap coupling capacitors and Black Gate bypass capacitors. • 48 dB phono gain, two 18 dB line inputs, two line outputs. • Individual channel level controls plus volume control for optimum gain adjustment. • 2 x 12SN7GT (switchable for 6SN7GT) and 2 x 12SC7. • Separate PS 2 power supply included. (Shown in custom grey hammertone finish) More Information • Customer Comments

*PS 2 Power Supply (included with Line 2A SE (assembled and as a kit), Phono 4 SE, and Ultra 4A SE)* • Provides 12 VDC@1A (regulated) and +200 VDC@15 mA. • Power cable and detachable IEC line cord included. • Employs high-speed diodes with 6X5GT rectifier tube in hybrid bridge. • Soft startup relieves stress on tubes and filter capacitors. More information
Headphone Amplifiers
"Now I have to listen to all my CDs all over again. I have a decent stereo system but with the Ear+ it sounds like a $20,000 setup". *Review of the Ear+ by Steve Albers on Audio Asylum* *Review of the Ear+ by Nicholas Schell on Head-Fi* *Comments on Audiogon* *Designing the Ear+ by Lloyd Peppard* *User Comments*
*Ear+ HD High Definition Headphone Amplifier (kit and assembled)* • Outstanding headphone performance for a wide range of headphone impedances and drive requirements. • 2 x 12B4A NOS and 1 x 5751/12AX7/ECC83 tubes. • High and low impedance headhone jacks. • Premium passive components include Tantalum film plate resistors and Black Gate capacitors in signal path. • Ultra high-speed rectifier diodes and Alps volume control are standard. • Passive line output for use as a passive preamp. • Dual inputs for easy patching into system. More Information • Customer Comments New styling shown in red with black face and ebonized maple side panels,
Power Amplifiers
*Super Stealth* monobloc power amplifier (kit and assembled). Using the new EH 6V6GT tubes in class AB ultra-linear push-pull, the Super Stealth delivers a clean 8 W, making it suitable for a wide range of speaker systems. Available as a kit or factory assembled. • 20-20 kHz -1 dB at 5W • Mullard topology driver circuitry using 12SJ7 pentode and 12SC7 cathode-coupled phase inverter. • Supplied with EH 6V6GT matched pair output tubes. • Quiet, ultra high speed diode power supply and DC heater supply for all tubes. • Ultra-low output noise–less than 025 mV (90 dB below rated output) makes it suitable for high-efficiency speaker systems. • Input level control for optimum sensitivity adjustment; input sensitivity 0.5 V. • Compact chassis 7" x 12" x 6" overall. More Information Super Stealth kit manual
*Special Red octal driver module* for Dynaco Stereo 70 power amplifiers. A drop in, point-to-pointwired driver board using Mullard driver topology with 2-6SJ7 and 2-6SL7GT tubes. More Information Installation Manual
Other Products
The "Thingy" crossover and multi-channel driver. Based on the concepts described in the Branches newsletter issue 4 , the MAD Thingy is in production. It features buffered high and low pass filters to implement a 500 Hz high-level crossover for driving multiple speaker systems or bi-amp aplications, plus outputs for ambience and subwoofer channels. For more details, you can download the user's manual. User comments.
*Eyes for your Ears! The Viper Magic Eye Monitor.* Left and right channel levels are displayed by two 6E5C cathode ray tubes. Includes response speed and sensitivity controls with built in 12SC7 voltage amplifier stage. More information.
*LR 1 Line Router* • Any combination of 6 or less I/O lines is possible. Design it yourself to suit your needs. • Ideal for switching line sources between headphone amplifier or preamp or adding additional line inputs to preamp. • *LR 1 Pro* model features 3–2 switching with balanced I/O and XLR connectors.

Dr. P spins some 78s on his mini system. Photo by Christian Keresztes For more information or to place an order, please telephone or email Lloyd Peppard at (613) 387-3830 info@mapletreeaudio.com Lloyd Peppard Mapletree Audio Design 158 Seabrooke Rd R.R. 1, Seeley's Bay, Ontario, Canada K0H 2N0 Credit card payments through PayPal are highly recommended. Registered PayPal email address is lloyd.peppard@sympatico.ca.

Vacuum Tube Sound for the 21st Century

Preamplifiers

Headphone Amplifiers

Other Products

Vacuum Tube Sound for the 21^st Century