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Phono 3 Phono Preamplifier

User’s Manual

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

12SN7

12SC7
(R)

12SC7
(L)

1
2
3
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Summary of Contents for Phono 3

Page 1: ...r User s Manual 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 2...

Page 2: ...conjunction with a line preamp with at least 10 dB gain Selector switch for two separate phono inputs PSX Power Supply Connections_______ For operation with a separate line preamp or integrated amplif...

Page 3: ...ly units eliminates induced hum originating from power supply circuitry and components The PS 2a provides 12 VDC regulated at 1 2 A for the tube heaters and 200 VDC at 20 mA for the B plate voltage Se...

Page 4: ...plied to the Phono 3 It takes about 30 seconds for the tubes to reach operating temperature ready for use During operation is it normal for the power supply chassis to become quite warm to the touch T...

Page 5: ...reduced gain in one or both channels or an increase in noise levels Infrequently a heater may burn out which is indicated by total loss of sound Replacement tubes can be obtained from several supplier...

Page 6: ...Hz 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 Hum and noise at output less than 2 mV rms Phase inverting Power requirement...

Page 7: ...6 1 432K 1 1M 1 820p 4 3 3M 1 chassis 10n 6 8n 6 8n 47 5K 1 47 5K 1 Gnd Gnd Bus Gnd Bus 100u 400V 12SN7 12SN7 5 4 5 4 1 2 3 4 5 6 12SN7 7 8 61 V 166 V Gain 38 dB 1kHz with 33K load Noise 2 mV 200 V 47...

Page 8: ...e Audio Design Preamplifier Power Supply PS 2a Copyright Lloyd Peppard 2012 13 Rev Nov 4 13 6 8K 5W L N G 6X5GT 3 5 8 Rear View 7812 14VAC MUR180 115 VAC 115 VAC 115 VAC 115 VAC 115 VAC 25 mA 115 VAC...

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