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Summary of Contents for Mapletree Phono 3
- Page 1 Phono 3 Phono Preamplifier User’s Manual 12SN7 12SC7 12SC7 Revised Dec. 22/13 Mapletree Audio Design Lloyd Peppard R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0 (613) 387-3830 hollowstate.netfirms.com info@mapletreeaudio.com © Copyright Lloyd Peppard 2013...
- Page 2 Line 2B line preamp, the Ultra 4B phono/line preamp, the LR 1 line router, and the PS 2/2a/X power supplies. The features of the Phono 3 include: ? ? Compact chassis layout and separate power supply for low noise. The Phono 3 can share one PS 2a power supply with the Line 2B preamp if desired.
- Page 3 AC Line cord PS 2a Power Supply Connections______ If you purchased your Phono 3 with the Line 2B SE line preamp and are sharing a common power supply, you will be provided with the PS 2a power supply. The PS 2a power supply provides high voltage (B+) and heater voltage (A) for both the Line 2B and Phono 3 preamps.
- Page 4 Once the interconnecting power cable(s) are securely attached between the power supply and Phono 3 and the line cord is plugged in, the ac power switch may be turned on. A separate power switch is located on the rear panel of the Phono 3, adjacent to the power input jack.
- Page 5 The highly regarded 12SX7GT is equivalent to the 12SN7GT. Warranty___ Mapletree Audio Design warrants the materials and workmanship (parts and labor) for a period of 2 years to the original purchaser. Tubes are warranted for 90 days. Electrolytic capacitors are heat sensitive with lifetimes that vary with usage and are not covered by the warranty.
- Page 6 Phono 3 Specifications______ RIAA equalization: 50 Hz–20 kHz ? 0.5 dB (typically ? 0.3 dB) Gain: 38 dB ? 1 dB with 30 k? - ? load Output impedance (1 kHz): 2.5 k? Input impedance: 47 k? ?for both inputs...
- Page 7 Mapletree Audio Design © Copyright Lloyd Peppard 2009-13 Phono 3 Preamplifier Rev. Dec. 22/13 47.5K ½ 12SN7 5.1K 2W 22.1K +166 V +200 V 12SC7 221K 100u 100u/400V 0.1u 332K 1% 221K 400V 400V 820p 0.1u/400V 1.8K +61 V 432K 1% L.
- Page 8 Mapletree Audio Design Preamplifier Power Supply PS 2a © Copyright Lloyd Peppard 2012-13 Rev. Nov 4/13 Power 6X5GT 1A/250V MUR180 6.8K 5W 120VAC 60 Hz 50/500 25 mA 50/500 330K/1W Chassis Line 2 Power Out Rear View 14VAC 1N4007 12 V 14VAC 1.5 A...
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