{"id":4033,"date":"2024-02-11T10:21:08","date_gmt":"2024-02-11T18:21:08","guid":{"rendered":"https:\/\/philcoradio.com\/library\/?page_id=4033"},"modified":"2024-02-11T10:21:08","modified_gmt":"2024-02-11T18:21:08","slug":"rca-t9-10-restoration-part-4","status":"publish","type":"page","link":"https:\/\/philcoradio.com\/library\/index.php\/shop-talk\/rons-radios\/rca-t9-10-restoration-part-4\/","title":{"rendered":"RCA T9-10 Restoration \u2013 Part 4"},"content":{"rendered":"

<\/p>\n

As you may recall in the last installment of this series, I was considering my options for cleaning the top of the T9-10 chassis.<\/p>\n

In the photo above, it doesn\u2019t look too dirty. But in reality, the top of the chassis was extremely grungy, dirty, nasty, filthy\u2026pick the word you like, it is applicable.<\/p>\n

I knew that if I cleaned the top of the chassis, the note written by the previous \u201crepairman\u201d would be lost. I decided it was worth losing the handwritten note, as it was more important to me to get that filth off the chassis to the best of my ability.<\/p>\n

While I pondered my options, the T8-14 parts chassis I had ordered arrived via FedEx.<\/p>\n

<\/p>\n

An RCA T8-14 parts chassis. This is very similar to the T9-10 chassis.<\/em><\/p>\n

The main difference between the two chassis, besides the absence of a 6E5 tuning eye in the T8-14, was that the T8-14 uses a 5Z3 rectifier with a metal shield, while the T9-10 uses a metal octal based 5Z4 tube.<\/p>\n

The first thing I checked was the T8-14\u2019s tuning condenser \u2013 which was the reason I bought the chassis in the first place.<\/p>\n

Fortunately, it was good and had no obvious damage at all.<\/p>\n

<\/p>\n

The T8-14\u2019s tuning condenser is in good shape.<\/em><\/p>\n

I then set the parts chassis aside. I had decided to clean the T9-10\u2019s chassis first, and then replace all needed rubber-covered wiring, resistors, and also restuff the paper and electrolytic capacitors before I installed the replacement tuning condenser on the chassis.<\/p>\n

I had purchased a two-pack of Dremel abrasive buff wheels. However, I found that in using them, they were great at removing dirt and grime but they did not last very long at all.<\/p>\n

The photo below shows how far I managed to get using both buffing wheels, before both self-destructed.<\/p>\n

<\/p>\n

A partially cleaned T9-10 radio chassis.<\/em><\/p>\n

By now, I realized that I should have simply used hand cleaner with pumice.<\/p>\n

I had a can on hand. Or, at least I thought I did.<\/p>\n

When I opened the can, I found it was all but empty.<\/p>\n

I wondered to myself, Why did I save this can?<\/em><\/p>\n

There was nothing else to do but purchase another can of orange hand cleaner with pumice.<\/p>\n

Once I had the new can of cleaner, I taped over the two remaining tube sockets and carefully removed the cylindrical shields from the three RF coils. I also removed the clamp holding the shielded antenna cable in place on top of the chassis.<\/p>\n

I then proceeded to carefully scrub the rest of the top of the chassis using the hand cleaner. It did an excellent job of getting rid of the dirt and grime.<\/p>\n

When I was finished, the chassis looked as shown below.<\/p>\n

<\/p>\n

How the chassis looked after a thorough cleaning.<\/em><\/p>\n

Next, I began to clean and polish each of the aluminum coil shields. (I had previously cleaned and polished the IF transformer shields, and remounted the IF transformers inside each shield.)<\/p>\n

I discovered that these shields do not polish to a mirror-like finish as do most Philco IF shields but remain mostly dull. They do respond very well to a rubdown with steel wool prior to polishing with Mothers Mag & Aluminum Polish.<\/p>\n

These coil shields have flanges on the bottom ends. Each shield is held in place with two pieces of metal used as clamps on two of the four flanges.<\/p>\n

I found that one of the coil shields had cracks at its flanges. Fortunately, the T8-14 parts chassis had all its coil shields. I therefore pulled a coil shield from the T8-14 chassis which had undamaged flanges, and gave it a good cleaning and polishing.<\/p>\n

Once I was finished, all three shields were reinstalled over the coils on top of the chassis, and I reinstalled the clamp which holds the shielded antenna cable in place. I also bolted the IF transformers back into place \u2013 but did not rewire them into the radio circuitry yet.<\/p>\n

<\/p>\n

All coil shields and IF transformers remounted on top of the now-clean chassis.<\/em><\/p>\n

Now comes the restuffing of capacitors and replacement of resistors and rubber-covered wire. I prefer to use 20 gauge PVC insulated hookup wire rated at 600 volts to replace the old rubber-covered wires. I was nearly out of 600 volt rated wire, and needed more to work on this set. I soon discovered, much to my dismay, that it was easy to find 300 volt rated wire but not 600 volt wire!<\/p>\n

Next time, I will tell you how I finally managed to find some wire, and I will also proceed with the recapping, rewiring, and re-resistoring. Stay tuned!<\/p>\n

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

As you may recall in the last installment of this series, I was considering my options for cleaning the top of the T9-10 chassis. In the photo above, it doesn\u2019t look too dirty. But in reality, the top of the chassis was extremely grungy, dirty, nasty, filthy\u2026pick the word you like, it is applicable. I […]<\/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-4033","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages\/4033","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=4033"}],"version-history":[{"count":1,"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages\/4033\/revisions"}],"predecessor-version":[{"id":4093,"href":"https:\/\/philcoradio.com\/library\/index.php\/wp-json\/wp\/v2\/pages\/4033\/revisions\/4093"}],"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=4033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}