02-07-2010, 08:29 AM
Vacuum Tubes, Inc. lists a JFD type B as a universal replacement for your ballast, plus many others. You may want to talk to Jim Cross (the owner) about this?
<!-- m --><a class="postlink" href="http://www.vacuumtubesinc.com/">http://www.vacuumtubesinc.com/</a><!-- m -->
His site has a "Contact Us" page.
A year or so ago I had to restore a Detrola for a friend. It had two of those BK55BG ballast tubes. Fortunately they were both still good.
I think your dial scale was just made that way for two reasons: One, for ease of tuning - the top scale is divided by fives (55, 65, 75, etc.) and the bottom one by zeros (60, 70, 80, etc.). Second, just for style's sake.
<!-- m --><a class="postlink" href="http://www.vacuumtubesinc.com/">http://www.vacuumtubesinc.com/</a><!-- m -->
His site has a "Contact Us" page.
A year or so ago I had to restore a Detrola for a friend. It had two of those BK55BG ballast tubes. Fortunately they were both still good.
I think your dial scale was just made that way for two reasons: One, for ease of tuning - the top scale is divided by fives (55, 65, 75, etc.) and the bottom one by zeros (60, 70, 80, etc.). Second, just for style's sake.
--
Ron Ramirez
Ferdinand IN
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