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Summary of Contents for Mapletree Super Stealth +
- Page 1 Super Stealth + Monobloc Power Amplifier Users' Manual Rev. Mar 25, 2019 Mapletree Audio Design Lloyd Peppard R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0 (613) 387-3830 info@mapletreeaudio.com http://www.mapletreeaudio.com © Copyright Lloyd Peppard 2015-19...
- Page 2 Introduction The Mapletree Audio Design Super Stealth + Monobloc Vacuum Tube Power Amplifier provides 30 W of clean output power within a compact chassis. It offers a number of desirable features: The exclusive use of high quality new old stock (NOS) and current production tubes that can be obtained at modest cost from many suppliers.
- Page 3 Powering Up_______ Please read this instruction manual thoroughly before powering up your Super Stealth + amplifiers for the first time. The location of the tubes is shown below. When installing tubes, locate the key on the central spigot and make sure it matches with the indent on the tube socket.
- Page 4 The Super Stealth + is designed to run the EL34 output tubes in self biasing mode (cathode bias), so no bias adjustments are required when changing tubes or powering up for the first time. The combined screen and plate current is around 58 mA per tube with a plate voltage of around 380 V.
- Page 5 Specifications___ Tube complement: 6SJ7/6SJ7GT, 6SL7, 2 x EL34 matched pair Rectifier: solid state with ultra high-speed silicon diodes Output configuration: Class AB ultra-linear push-pull with self bias (EL34 matched pair recommended) Driver circuit topology: Mullard type with pentode voltage amplifier (6SJ7) and cathode- coupled phase inverter (6SL7) Rated power output (8): 30 W Frequency response at 1 W output: 20 Hz–20 kHz –0.5 dB...
- Page 7 It is possible to touch up small chips with spray lacquer applied with a fine brush so a drop of paint fills in the chip. Consult Mapletree Audio Design for the automotive paint color for your unit.
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