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Philco Bakelite Block Condenser
Data
One of the disadvantages of working on an older Philco set is rebuilding the bakelite block condensers. Nevertheless, most experienced collectors know how to do the job; normally by heating the block with a source of heat such as a heat gun until the high temperature wax (which looks more like tar) softens enough that the components inside the block may be removed. However, the really difficult part is in figuring out how the capacitors (and sometimes resistors) connect inside each different bakelite block. Fortunately, Philco periodically published data on their bakelite block condensers. A particularly helpful issue is Service Bulletin 289, from August 1937. We have scanned Bulletin 289 and have made it available for your use here. While it does not give details for every bakelite block Philco ever made, it gives enough information that most of them can either be seen or figured out by using what is provided in this Bulletin. The Bulletin has two pages and is presented here in high resolution JPG format. Please note that unless you have a very large monitor, you will have to do a lot of scrolling to view these pages. You may wish to print them instead - the high resolution provides good print quality on a good, modern printer. We settled on 1000 pixels wide for each page to keep the pages at a somewhat reasonable file size yet still providing clear print outputs. Click on a page below to view the Bulletin (use your browser's BACK button to return here after viewing). Bulletin
289 - Page 1
JPG
More
information on the bakelite blocks, including complete instructions
on how to rebuild them, may be found at the Philco
Repair Bench. A more comprehensive treatment of the Philco bakelite block condensers may be found in the book Philco Condensers And More, written by Ray Bintliff. The book not only gives details on all known Philco bakelite blocks, but also covers Philco metal can condensers and tone controls made between 1930 and 1936, also. These also have capacitors embedded in high temperature wax, and the repair procedure for these is much the same as rebuilding a bakelite block.
The
book is highly recommended for the serious Philco collector. The price
is $14.95 plus $3 shipping, and is available from Antique
Radio Classified. Return to the Tech Section Index. © 1997-2006, Ron Ramirez. All
rights reserved. Unauthorized duplication prohibited.
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