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- Page 1 Modular Series Line 2B SE Stereo Line Preamplifier User’s Manual Revised Nov 18/13 Mapletree Audio Design Lloyd Peppard R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0 (613) 387-3830 www.mapletreeaudio.com info@mapletreeaudio.com © Copyright Lloyd Peppard 2002-2013...
- Page 2 Introduction The Mapletree Audio Design Line 2B SE Stereo Line Preamplifier is part of the MAD Modular Series of preamp/power supply components. It offers the audiophile a number of desirable features: ? ? Compact chassis layout for use with separate power supply for low noise.
- Page 3 RCA jacks are provided for three stereo line inputs, and two stereo line outputs. Depending on how you ordered your Line 2B SE, the line input gains may be different. The standard configuration is 10 dB for all inputs. Consult the invoice included with your shipment to verify the gains for your unit.
- Page 4 Infrequently, a heater may burn out which is indicated by total loss of sound. 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 5 Parts List______ Part No. Description C2a,b, C4a,b 1.0uF/200 V polypropylene film capacitor C3a,b 0.1uF/400 V pp film cap. 100uF/400 V electrolytic cap. D1a,b 10 mA red LED J1a,b–J5a,b RCA gold plated phono jack chassis jack (power in) P1a,b 100K dual audio potentiometer (Alps) 100K linear potentiometer R1a,b 100K 0.6 W 1% metal film resistor for 10 dB gain (see schematic)
- Page 6 Mapletree Audio Design Line 2B SE Stereo Line Preamplifier © Copyright Lloyd Peppard 2002-2013 Rev. Nov 4/13 Gain 340K 182K 100K Input resistance ~ R1 +185 V +210 V 24.6K 47.5K 1% 6/12SN7GT 22.1K 511 1% +75 V SW1a R1a-3 Volume 0.1/400...
- Page 7 Circuit Operation______ Both channels are identical as shown in the schematic diagram. Operation will be described for the left channel. The selector switch (SW1) selects from one of the three line inputs (jacks J1–J3). Series resistors (R1) determine the gain of each line input. The maximum gain, with zero resistance, is approximately 22 dB.
- Page 8 Mapletree Audio Design Preamplifier Power Supply PS 2 © Copyright Lloyd Peppard 2003-13 Rev. Nov 18/13 D3, D4 Power 6X5GT 1A/250V MUR180 6.8K 5W 115 VAC 25 mA 120 VAC 50-60 Hz 50/500 50/500 330K 1W Chassis Power Out Rear View...
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