{"id":3401,"date":"2024-01-27T07:21:27","date_gmt":"2024-01-27T15:21:27","guid":{"rendered":"https:\/\/philcoradio.com\/library\/?page_id=3401"},"modified":"2024-01-27T07:21:27","modified_gmt":"2024-01-27T15:21:27","slug":"philco-model-38-690-repairs-part-8","status":"publish","type":"page","link":"https:\/\/philcoradio.com\/library\/index.php\/shop-talk\/rons-radios\/philco-model-38-690-repairs-part-8\/","title":{"rendered":"Philco model 38-690 Repairs \u2013 Part 8"},"content":{"rendered":"

When we last discussed this project last year \u2013 three weeks ago \u2013 I had mostly reassembled the oscillator section and had reattached it to the sub-base. After taking a Christmas\/New Year\u2019s break from this project, I returned to it last week and began by adding the final components to the oscillator section.<\/p>\n

\"A<\/p>\n

Almost completely rebuilt, the 37-116 oscillator section will soon be ready for reinstallation.<\/em><\/p>\n

I removed the oscillator section from the sub-base in order to finish installing some of the new components. It is a good thing I did so. I discovered that I had made some errors in wiring. Instead of connecting resistors (34) and (35) to switch terminals J10 and J9, respectively, I had connected them to terminals J9 and J8. Oops. I quickly corrected that error before going any further.<\/p>\n

See the switch hookup below.<\/p>\n

\"Diagram\n\nDescription<\/p>\n

37-116 oscillator section switch wiring<\/em><\/p>\n

Everything else looked okay, and therefore I proceeded to connect the remaining components and to reattach the oscillator section to the sub-base.<\/p>\n

\"A<\/p>\n

Oscillator section reinstalled on sub-base<\/em><\/p>\n

Feeling more confident at this point, I went ahead and reattached the converter (RF) and the antenna sections to the sub-base and reinstalled the switch shaft.<\/p>\n

\"A<\/p>\n

All sections reassembled on the sub-base
\n<\/em><\/p>\n

\"A<\/p>\n

Another view of the rebuilt RF unit<\/em><\/p>\n

Having reinstalled the switch shaft and attaching its two bolts, something told me I should try switching the assembly through its five positions.<\/p>\n

Immediately something did not feel \u2013 or sound \u2013 right.<\/p>\n

I looked\u2026and saw a bent switch contact on the rotor of section D, which is part of the converter or RF section.<\/p>\n

\"A<\/p>\n

Just what I needed\u2026another problem.<\/em><\/p>\n

Beautiful.<\/p>\n

And of course, switch section D \u2013 the last section on the assembly when you disassemble the three section stack \u2013 is the one with the bent contact. This would necessitate a total re-disassembly of the RF section, replacement of the bad switch wafer, and re-reassembly.<\/p>\n

And then I remembered something\u2026<\/p>\n

Next time, I will tell you about what I remembered and what I decided to do to get myself out of this mess.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

When we last discussed this project last year \u2013 three weeks ago \u2013 I had mostly reassembled the oscillator section and had reattached it to the sub-base. After taking a Christmas\/New Year\u2019s break from this project, I returned to it last week and began by adding the final components to the oscillator section. Almost completely […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2599,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3401","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages\/3401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/comments?post=3401"}],"version-history":[{"count":1,"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages\/3401\/revisions"}],"predecessor-version":[{"id":3408,"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages\/3401\/revisions\/3408"}],"up":[{"embeddable":true,"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages\/2599"}],"wp:attachment":[{"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/media?parent=3401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}