Vacuum Tube Sound for the 21st 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. 


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Other Products (download User's Manuals from home page or contact Mapletree Audio for more information)

Power Amplifiers


Stealth Max Monobloc Power Amplifier - 50 W with KT88s running class AB1 ultra-linear with fixed bias. Triode mode switch. Built on a stainless steel Dynaco Mk III chassis  with Mullard  topology driver circuitry (6SJ7 voltage amplifier and 6SN7GT long-tail phase inverter) and Dynaco spec output and power transformers. WIth premium passive components and a very stiff power supply, the sonics are effortless and open, espeicially noticable on high level transients. Available for 240 VAC ( $30 additional).


               

                     


Super Stealth monobloc power amplifier. Using the 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.
• 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.









Super Stealth SE
monobloc power amplifier
. The special edition of the Super Stealth includes provision for 12 V or 6 V driver tubes, dc balance adjustment for output tubes, and bias adjustment.



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. 








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.





Line  Routers

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.