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  <changefreq>Hammarlund HQ-160, spec &amp; mod pages</changefreq>
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<url>
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<url>
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  <priority>AGC + S-Meter Operation on SSB mod</priority>
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<url>
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  <changefreq>Hammarlund HC-10 Converter, spec &amp; mod pages</changefreq>
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  <priority>HC-10(A-mod) + HC-10/SPC-10 schematics</priority>
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<url>
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  <changefreq>Hammarlund HQ-170A-VHF tech-spec page</changefreq>
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  <priority>SSB reception method &amp; low IF tests</priority>
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  <priority>Schematics &amp; Overhaul</priority>
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<url>
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  <changefreq>The 'Silver Mica Disease' issue</changefreq>
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  <changefreq>TV-7's and TV-7D/U Tube Tester</changefreq>
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  <priority>RANGES: Gm calibration using a 6L6 tube</priority>
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<url>
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<url>
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<url>
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  <priority>Data &amp; documentation page</priority>
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<url>
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  <priority>About tubes and tube testers</priority>
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<url>
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  <priority>Usual care &amp; troubleshooting</priority>
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<url>
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  <changefreq>AN/URM-25 Series Signal Generators</changefreq>
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<url>
  <loc>https://otttsite.com/e_urm-25d/urm-25ovh.htm</loc>
  <priority>URM-25D Overhaul</priority>
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<url>
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  <priority>URM-25D Tests &amp; Adjust</priority>
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<url>
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  <priority>URM-25s by schematics</priority>
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<url>
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  <changefreq>Collins 75A-4 receiver</changefreq>
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<url>
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  <priority>Capacitor issues on Collins 75A-4 receivers</priority>
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<url>
  <loc>https://otttsite.com/e_75a-4/75a-4align.htm</loc>
  <priority>Alignment of the Collins 75A-4 receiver</priority>
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<url>
  <loc>https://otttsite.com/e_75a-4/75a-4mods.htm</loc>
  <priority>Modifications for the Collins 75A-4 receiver</priority>
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<url>
  <loc>https://otttsite.com/e_51j-5/51j-5.htm</loc>
  <changefreq>Collins 51J-5 receiver</changefreq>
</url>
<url>
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  <priority>51J-5 conversion tables and adjusting procedures</priority>
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<url>
  <loc>https://otttsite.com/e_51j-5/51j-5agcdc.htm</loc>
  <priority>A delayed AVC with DC amplification for the 51J-5</priority>
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<url>
  <loc>https://otttsite.com/e_51j-5/51j-5rumors.htm</loc>
  <priority>A confusing story on the Collins 51J-5</priority>
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<url>
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  <priority>The classic and bulky Collins PTO</priority>
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<url>
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  <changefreq>The Johnson Matchbox</changefreq>
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<url>
  <loc>https://otttsite.com/e_eddystone/909a.htm</loc>
  <changefreq>Eddystone 909A Marine Receiver</changefreq>
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<url>
  <loc>https://otttsite.com/e_hw-101/hw-101rvstd.htm</loc>
  <changefreq>Heathkit HW-101 transceiver part I, about mods</changefreq>
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<url>
  <loc>https://otttsite.com/e_hw-101/hw-101tubes.htm</loc>
  <changefreq>Heathkit HW-101 transceiver part II, about tubes</changefreq>
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<url>
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  <changefreq>Heathkit C-3 Condenser Checker</changefreq>
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<url>
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  <changefreq>Heathkit IT-22 Capaci-Tester</changefreq>
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<url>
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  <changefreq>Heathkit CM-1 Direct Reading Capacity Meter</changefreq>
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<url>
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  <changefreq>Eico 955 In-Circuit Capacitor Tester</changefreq>
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<url>
  <loc>https://otttsite.com/e_eico-test/eico710.htm</loc>
  <changefreq>Eico 710 Grid-Dip Meter</changefreq>
</url>
<url>
  <loc>https://otttsite.com/e_q-factor/qm-1.htm</loc>
  <changefreq>Heathkit QM-1 Q Meter</changefreq>
</url>
<url>
  <loc>https://otttsite.com/e_mil-spec/ssb-r390a.htm</loc>
  <changefreq>Product Detectors and Automatic Gain Control for SSB</changefreq>
</url>
<url>
  <loc>https://otttsite.com/e_mil-spec/ls-3.htm</loc>
  <changefreq>LS-3 Loudspeaker, a matched speaker for R-390A</changefreq>
</url>
<url>
  <loc>https://otttsite.com/e_mil-spec/r390a-parts.htm</loc>
  <changefreq>R-390A Parts List</changefreq>
</url>
<url>
  <loc>https://otttsite.com/e_mil-spec/r-390diffs.htm</loc>
  <changefreq>Differences between receivers R-390 &amp; R-390A</changefreq>
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