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| ref. typology |
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| select signal tube 6922 vs 12Ax7 |
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| take off PL519 40V heater transformer |
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| for 6DJ8 6.3V heater |
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| make sure the -Voltage for gride bias |
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| add 1st 6922 tube sockect |
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| DAC feed in 1K wave then transfer to analog 1Khz waveform |
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| 1st stage 6922 gain tuning to balance p-pV |
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| 2nd stage 6922 gain p-pV w offset |
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| the resistor of low noise preamplifier |
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| benchmark we437a vs EH 6c45-pi |
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| benchmark Japan 1970 low noise tube |
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| modify PL519 amplifier...switch to VT-4C amplifier |
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| ROWE AMI MM1 1967 turntable |
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| AMI RI-1G 1972 turntable |
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| AMI H200 1957 turntable |
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| Rock Ola 1975 turntable |
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| TSUGAMI AMi Lyric 1962 turntable |
 |
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| Triodes tube 6C33 Cathode output |
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| Pentodes tube EL34 Cathode output |
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| The Amazing FET Circlotron |
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| BAT（Balanced Audio Technology） VK-55SE |
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| 6C33 inside |
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| DAC's RIAA profile option |
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| Ribbon speaker |
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| w plasma tweeter |
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| 唐竹 |
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| Ray audio speaker |
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| DS optical cartridge |
