• Various Mini-Circuits module internals: Analysis & Photos
• Remec ED-0421-0 15 Ghz transmitter from wireless broadband system: Analysis & Photos
• Various telecom modules: Photos
  Featuring microwave circuitry & optical/opto-electronic modules
• Frequency Divider board from frequency synthesizer of Collins 651S-1 radio: Photos

  Featuring a variety of 60's/70's flatpacks

• ENI 5100L 100W RF power amp: linear, broadband: Photos
• Amplifier Research AR200L 200W RF power amp: linear, broadband: Photos
  Featuring a lot of paralleled vacuum tubes

Overlap from "test & measurement equipment" list: (https://hackaday.io/project/193010-interesting-test-measurement-teardowns)

• Teradyne microwave downconverter/demodulator from some kind of automated test equipment: Analysis & Photos
  
  • Opened RF hybrid modules from this board: Analysis
• HP 8508A 1 Ghz vector voltmeter: Analysis & Photos
• Bruker NMS120 benchtop NMR analyzer/relaxometer: Analysis & Photos
• Stanford Research Systems CG635 2 Ghz synthesized clock generator: Analysis & Photos
• Rohde & Schwarz FSL 3 Ghz spectrum analyzer: Analysis & Photos
• Rohde & Schwarz CMW 270 WiMax tester: RF front-end module: Analysis & Photos

Overlap from "avionics & high-reliability teardowns" list: (https://hackaday.io/project/193009-avionics-other-high-reliability-teardowns)

• SINCGARS military radio RF boards: Analysis & Photos

  PLLs as far as the eye can see

• Bonzer Mini-Mark Radar Altimeter: Analysis & Photos
  Includes interesting multi-Ghz RF section from the 70's
• Raytheon old military radio UHF receiver for frequency-hopping: Analysis & Photos
  Includes a frequency synthesizer built from generic digital logic
• Cubic Defense mystery RF boards & hybrids: Analysis 1, Analysis 2 & Photos
• RF frequency multiplier from AN/APQ-120 radar: Analysis & Photos
  60's microwave components in an X-band fighter jet fire control radar
• Merrimac PSD-4-30.7/27741 RF Phase Shifter: Analysis & Photos
  Includes sketchy construction methods & questionable reliability