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Summary of Contents for Mapletree stealth 5
- Page 1 Stealth 5 Monobloc Power Amplifier User’s Manual Rev. May 21/03 Mapletree Audio Design Lloyd Peppard R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0 (613) 387-3830 peppardl@post.queensu.ca http://hollowstate.netfirms.com © Copyright Lloyd Peppard 2002-2003...
- Page 2 ♦ DC heater power supply for low noise. The MAD Stealth 5 is a monobloc audio power amplifier with integral power supply. Two units are required for stereo reproduction. While the input level control can be used to set the volume level when feeding the input directly from a line-level source, the use of a line preamplifier is recommended for convenience and flexibility.
- Page 3 For preamps with high gain, it may be desirable to adjust the level control on the Stealth 5 to enable the preamp volume control to operate around its mid position at normal listening levels.
- Page 4 Chassis layout fuse speaker input level input ac input output transformer power transformer heater dc supply transformer heater voltage 12A6 12A6 12SC7 12SJ7 ac power pilot Tube replacement and experimentation_____________ The tubes supplied are 12 V heater, metal envelope types. These are new old stock (NOS) tubes that are not currently manufactured.
- Page 5 Appendices Specifications Output transformer wiring diagrams Replacement parts list Schematic diagram...
- Page 6 MAD Stealth 5 Specifications______ Maximum output power into 8 Ω load before clipping: 6 W Hum and noise output with zero signal in: less than 1 mV (77 dB below 6.5 W) Input resistance at 1 kHz: 100 kΩ Output resistance at 1 kHz: less than 0.1 Ω (damping factor greater than 80) Frequency response (1 W output): 12 Hz–20 kHz –...
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Page 7: Replacement Parts List
Replacement Parts List Reference Description Qty. 100uF/16V electrolytic capacitor C2, C4 1uF/250V polypropylene capacitor 470pF/630V 1% polypropylene capacitor C5, C6 0.56uF/630V polypropylene capacitor 47uF/63V electrolytic capacitor 2.2nF/250V 1% polypropylene capacitor Green 10 mA light emitting diode (LED) 2 A/250 V 1-1/4" fuse Fuse holder RCA gold plated phono jack J2, J3... -
Page 8: Schematic Diagram
Schematic Diagram Mapletree Audio Design Stealth 5 Monobloc Power Amplifier © Co pyright Ll oyd Peppard 2002-2003 Re v. May 15/03 12A6 +262 V R1 4 * 0.4 W 0.56/630 866* 12SJ7 12SC7 Al l oth er resistors 0.6 W...
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