Earphone amp with RIAA-MM and AUX input

Earphone amplifier with LP record player MM input and AUX input, made Jan. 2008.
右邊分離電源。made in Taiwan元山機殼






2支12AX7當RIAA等化，做RC-feedback。2支417A後段放大for earphone or power amplifier。
 2支New Old Stock can type capacitor 10/10/100 uF， MM─AUX selecting switch， made in India 水晶球當把手




右手made in China 12.6 VDC regulator
中power supply 200-240 VDC
左 amplifier 耳機輸出、preamp輸出共用個插座






power supply transformer 110 vac/36-0-36 vac三個串連提供 185-220 vac.
2h-100 mA choke, capacitor input  CLRCRCRC 濾波





4 x RCA input + 1 RCA ground (fix later), 4-pin power connector(shown during testing )




2 x output trans 2.5k/8
volume 100 ohms in output 二次側
(shown actual)





shown actual and connected