2011年3月24日 星期四

Toy12 Plasma tweeter 離子高音 Diy-10 RF power amplifier PL519 check sound color

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PL519 Power amplifier for plasma tweeter RF radiation and Heater  40V. Under testing picture and test plasma radiation. Modify PL...
2011年3月5日 星期六

Toy13 300B Amplifier DIY Record....2

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Insist 6C45Pi and 300B is AC heater. Finish signal tube B+ voltage connect and 300B cathode voltage setup. Finish signal tube B+ conne...
2011年2月15日 星期二

Toy13 300B Amplifier DIY Record....1

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Design & drawing 300B high voltage  circuit with delay on function. Main power switch setup in 300B case. High voltage will be remot...
2011年2月3日 星期四

Toy3 D/A couple capacitor of Balance output estimate -2 more cap. & different value

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D/A couple  capacitor of Balance output estimate -2 more cap. & different value Unknown PP couple capacitor. Audio shallow, Sounds to...
2011年1月23日 星期日

Toy11 VT4C 211AMP -5 ..... verify 211 AC heater capacitors sound color

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I like sound of AC heater for VT4C so I do some circuit modify as drawing. Old connect as below and no 62ohm/50W resistors & no capa...
2011年1月19日 星期三

300B tubes

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Just receive 300b tubes shipping from China. 曙光白底座茄子型. 300B testing specification. Plate current 45mA. Old 曙光 300B-98 close view. ...

MID phone

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MID phone all special parts. x86 PC part PCB Top and bottom views. CPU VIA C7M Nano 500MHz and Vx875 chip set. DDRII 512M. ...