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ref. typology |
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select signal tube 6922 vs 12Ax7 |
6922 Left channel
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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 |