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pen4dThis page was created by PEN4D Situs Slot Qris Resmi with Hopp by Wix. PEN4D Komunitas Slot On Indonesia Resmi 2025. pen4d | pen 4d | pen4d login | pen4d slot | pen4d alternatifThe Pen4DD is from the early mains-valve era. As a double diode output pentode it was to perform the function of snal detection, AGC detection, and audio output.