[EN list]                                                       

♠ Hammarlund HQ-160 Receiver, spec & mod pages.
• Hammarlund SSB system, brothers in arms:
   ♠ HC-10 Converter, spec & mod pages.
   ♠ HQ-170A-VHF Receiver, spec & ovhl pages.
   ♠ HQ-180 Receiver, spec & ovhl pages.
♠ The 'Silver Mica Disease' issue.
♠ TV-7D/U & TV-7 Tube Testers, spec & adjust pages.
♠ URM-25D & 25x Signal Generators, spec & ovhl pages.
• Collins' 1950s SSB Blood Brothers:
   ♠ Collins 75A-4, Amateur Bands + CB Receiver.
   ♠ Collins 51J-5 General Coverage SW Receiver.
• Collins R-390A & related pages
   ♠ The R-390A Receiver; specs, design, overhaul.
   ♠ SSB integration into the original R-390A design.
   ♠ The LS-3 loudspeaker, best speaker for R-390s?
   ♠ The elusive R-390A parts list (not in Army TMs).
   ♠ Differences between receivers R-390 & R-390A.
♠ The Johnson Matchbox.
♠ Eddystone 909A Marine Receiver.
♠ The Heathkit transceiver, HotWater-101 revisited.
• Vintage capacitor test & measurement:
   ♠ Heathkit C-3, Condenser Checker.
   ♠ Heathkit IT-22, In-Circuit Capaci-Tester.
   ♠ Heathkit CM-1, Direct Reading Capacity Meter.
   ♠ Eico 955, In-Circuit Capacitor Tester.
♠ Eico 710, Grid Dip Meter.
♠ Heathkit QM-1, Q Meter.