Collins KWM-2 / KWM-2ARestoration Deep-Dive Arthur Collins’ Masterpiece • 1959–1977 • The Compact S-Line That Went to War Of all the rigs to emerge from Cedar Rapids, Iowa during the golden age of amateur radio engineering, the Collins KWM-2 occupies…
Alpha 87A Linear Amplifier:Restoration & Service Guide 3CX800A7 Tubes • PIN Diode T/R Switching • Transceiver Keying & TX Delay • Microprocessor Control • Fault Code Reference • Cabinet & Safety 📝 VK6ADA Technical Papers 📅 March 2026 — Rev.…
Alpha / ETO 91B Linear Amplifier:Restoration & Service Guide 4CX800A/GU74b Tetrodes • Grounded-Cathode Grid-Driven • Vacuum Relay QSK • Electronic Bias System • Cabinet & Safety 📝 VK6ADA Technical Papers 📅 March 2026 ⚡ 1,500 W — 4CX800A/GU74b Tetrode 🇧🇬 Assembled…
Alpha 9500 Linear Amplifier:Restoration & Service Guide 3CX1500A7/8877 Triode • Five I²C Microprocessors • Auto Mains Tap • Gigavac Vacuum Relays • Three Stepper Motors • Cabinet & Safety 📝 VK6ADA Technical Papers 📅 March 2026 ⚡ 1,500 W — 3CX1500A7/8877…
Alpha 8410 Linear Amplifier:Restoration & Service Guide 4CX1500B Bayonet Tetrodes • Manual Tune • Swamped-Grid Input • EBS • PIC Microcontroller • Dual Input Match Relay • Cabinet & Safety 📝 VK6ADA Technical Papers 📅 March 2026 ⚡ 1,500 W —…
Emtron DX-1A Linear Amplifier:Restoration & Service Guide GU74B (4CX800A) Tetrode • AMPC Control Board • TRIAC Soft-Start • EBS Jumper • Optional Jennings QSK • Emona Electronics Sydney • Cabinet & Safety 📝 VK6ADA Technical Papers 📅 March 2026 ⚡…
Emtron DX-1D Linear Amplifier:Restoration & Service Guide GU74B (4CX800A) Tetrode • RF Sub-Chassis & 9-Way Connector • Dedicated Display Board • SWR Protection • AMPC Control Board • TRIAC Soft-Start • TDA1085C • Dual Tank Coils • Emona Electronics Sydney…
Emtron DX-1SP Linear Amplifier:Restoration & Service Guide FU-728F (4CX1500B-class) Tetrode • 1,200 W CW / 1,500 W PEP • 8× 470 μF/500 V HV Bank • 40 A TRIAC Soft-Start • Dual-Polarity Screen Protection • Eimac 4CX1500B Compatible • OCC • FCC Approved 📝 VK6ADA…
Emtron DX-1V Linear Amplifier:Restoration & Service Guide 6-Metre (50 MHz) Specialist Variant • GU74B (4CX800A) Tetrode • Single-Band 50 MHz Pi-Network • AMPC Control Board • TRIAC Soft-Start • QSK Standard • Emona Electronics Sydney 📝 VK6ADA Technical Papers 📅 March 2026…
Emtron DX-2 Linear Amplifier:Restoration & Service Guide GU84B (4CX2500A) Tetrode • 27 V Heater • 1,500 W Carrier / 7 Bands • Ferrite Toroid “L” Coil • Two-Speed Blower • Ig2+/Ig2− Screen Current Metering • RF Sub-Chassis • 9-Way Connector • Emona…
Emtron DX-2A Linear Amplifier:Restoration & Service Guide GU84B (4CX2500A) Tetrode • 9-Band Full Coverage (160m–10m incl. WARC) • RF Module Schematic in DX-1D Documentation • Two-Speed Blower • Dual Temperature Sensors • All-Band Tank Circuit Upgrade • Emona Electronics Sydney…
Emtron DX-2SP Linear Amplifier:Restoration & Service Guide GU84B • 2,000 W Carrier / 2,500 W PEP • 4 kVA Transformer • Heavy-Duty H.V. Band Switch • Horizontal AMPC Board • Dual-Polarity Screen Supply • BTA40-600B TRIAC Soft-Start • 9 Bands 160m–10m incl. WARC • …