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Mapletree Audio Design
Ultra 4C Stereo Phono/Line Preamplifier
PS 2D Power Supply
U ltra 4C Preampl i fier
User's Manual
Rev. Mar. 22, 2019
Mapletree Audio Design
R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0
(613) 387-3830
www.mapletreeaudio.com
info@mapletreeaudio.com
-Specifications subject to change without notice-
© Copyright Lloyd Peppard 2002-2019
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Summary of Contents for Mapletree Ultra 4C
- Page 1 Mapletree Audio Design Ultra 4C Stereo Phono/Line Preamplifier PS 2D Power Supply U ltra 4C Preampl i fier User’s Manual Rev. Mar. 22, 2019 Mapletree Audio Design R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0 (613) 387-3830 www.mapletreeaudio.com info@mapletreeaudio.com -Specifications subject to change without notice- ©...
- Page 2 Introduction The Mapletree Audio Design Ultra 4C Stereo Phono/Line Preamplifier offers the audiophile a number of desirable features: Exclusive use of NOS octal tubes, known for low distortion and musicality. Switchable for use with 12SN7GT or 6SN7GTB tubes.
- Page 3 Power Supply Connections______ Power The Mapletree Audio Design PS 2D power supply provides +12 VDC (regulated) heater supply voltage and +200 VDC B+ plate supply voltage at a current of 15 mA (see specifications). It utilizes low-noise ultra high-speed diodes to achieve low noise with the high efficiency of the bridge rectifier topology.
- Page 4 The heater voltage switch located next to the power input jack allows you to accommodate either 12SN7GT (supplied) or 6SN7GTB tubes in your Ultra 4C. Note that the switch does not affect the heater voltage for the 12SC7 tubes. While it will do no damage to switch to 6SN7 position with 12SN7 tubes installed, operation in the 12SN7 position with 6SN7 tubes may damage the tubes.
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Page 5: Front Panel Controls
Replacement tubes can be obtained from several suppliers in the U. S. and Canada. Mapletree Audio Design will attempt to provide replacement tubes to customers at cost plus shipping. Some listeners enjoy trying different brands and variants of tubes. - Page 6 currently manufactured 6SN7 tubes may work well in the series configuration but this should be verified by measuring the voltage across each tube heater (pins 7-8). Care of your Ultra 4_____ The chassis finish is lacquer-based. Both the chassis and labels/logos are moisture resistant but you should avoid cleaning with water, alcohol, or other strong chemical.
- Page 7 Mapletree Audio Design Ultra 4C Specifications______ Phono Section (100 k load) Max. RIAA error: 0.5 dB 30–20 kHz Maximum Gain: 50 dB (1 kHz) Noise: less than 1 mV for gain of 40 dB Input resistance at 1 kHz: 47 k...
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