Technical Articles


  • Replacing Filter Capacitors on the Drake R-4B Receiver, by W6SPC

  • Drake T-4XB Solid-State Relay Keying Tube Replacement, by WA1KKM

  • 10-meter Adaptation for Drake L7, by WB8RXI

  • Cable TR7 to R7 esquematic

  • Cable RV75 to TR7 + R7 esquematic

  • TR-7 All Band Transmit, Low Frecuency Receive Mod.

  • Amplifier Drake L4B conversion to 3CX1500 (8877), By W2CQM

  • Amplifier Drake L4B + 6 meters band, By W2CQM

  • Toshiba 2SC2879 transistor DataSheet (PDF)

  • Macom MRF421 transistor DataSheet (PDF)

  • Motorola MRF421 transistor DataSheet (PDF)

  • TR7/A connections squematic for PSK31

  • R-4 and SPR-4 Crystal Eliminator

    • 7 Line Drake Scanned Circuits



    All circuits are digitized from the original Drake manuals by Max - EA1DDO


    Here you have more Drake squematics and manuals from Drake 1A to Drake R8B. (EA8ZQ Page)