This　article　introduces　the　demonstration　of　several　compact　millimeter　wave　sources　using　both　pencil　and　sheet-shaped　pseudospark　(PS)plasma　electron　beams.　There　are　four　devices　that　were　successfully　driven　by　PS　plasma-sourced　pencil　beams,　including　a　Ka-band　Cherenkov　maser,　two　backward　oscillators　(BWOs)　in　W-band　and　G-band,　and　an　extended　interaction　oscillator　(EIO)　in　W-band.　There　were　also　two　devices　successfully　driven　by　PS　plasma-sourced　sheet　electron　beams,　including　two　planar　EIOs　in　W-band　and　G-band.　These　devices　can　generate　tens　up　to　kilowatts　of　output　power,　which　are　very　attractive　for　many　important　applications.　This　article　will　especially　present　the　recent　advances　in　the　generation　of　high　quality　PS　plasma-sourced　electron　beams　using　a　compact　post-acceleration　unit　and　the　application　of　the　beams　in　compact　circular　and　planar　EIO　slow　wave　structures.　©　2018　IEEE.