tag:blogger.com,1999:blog-1354839434052330523.post1412443038796681499..comments2023-06-04T16:04:43.779-04:00Comments on Mr. Vacuum Tube: Colin B. Kennedy Model 20B radio repairsGregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1354839434052330523.post-17881289050777109992012-01-22T22:33:20.181-05:002012-01-22T22:33:20.181-05:00Bob,
These RF transformers are very easy to re-wi...Bob,<br /><br />These RF transformers are very easy to re-wind, you can handle it if need be. If you look around my blog from Dec throughout this month you will see a post somewhere where i show this happening.<br /><br />You can check each one using an ohm meter to be sure before your re-install your chassis.<br /><br />Not many turns, very easy to do. Wire from antique electronics supply, i think i bought a few spools worth of various small sizes.<br /><br />GregGregory L. Charvathttps://www.blogger.com/profile/16123672550243971371noreply@blogger.comtag:blogger.com,1999:blog-1354839434052330523.post-81542660198002339782012-01-22T22:29:59.578-05:002012-01-22T22:29:59.578-05:00Greg,
Thanks for the quick reply.
Interesting. I h...Greg,<br />Thanks for the quick reply.<br />Interesting. I hope I'm just facing some shorted caps, not sure if I am up to rewinding a coil yet.<br />My CBK20B is the earlier one with the push pull 45's that matches the diagram. <br />Going to take me a couple of weeks to restuff the caps, I'll post back when done.Rob D.https://www.blogger.com/profile/15903435326315714833noreply@blogger.comtag:blogger.com,1999:blog-1354839434052330523.post-10126969695661526452012-01-22T22:17:51.717-05:002012-01-22T22:17:51.717-05:00Rob, thank you for your questions.
I did end up ...Rob, thank you for your questions.<br /><br />I did end up re-stuff the coupling caps. It did not work for two different reasons:<br /><br />1. one of the windings on one of the RF transformers was open, so i had to re-wind it.<br /><br />2. The RF input transformer had a 75 ohm pot in-circuit before it, acting as an RF attenuator. This pot was inside the control grid rheostat. The wiring for this is factory, not a crappy repair. I removed this pot from the circuit and the radio works excellently now.<br /><br />The date codes on my decoupling caps read 1931, so my radio was a later production and my only guess is that by then they must have been goofing up things at the factory....Gregory L. Charvathttps://www.blogger.com/profile/16123672550243971371noreply@blogger.comtag:blogger.com,1999:blog-1354839434052330523.post-42459907742869420892012-01-22T22:12:22.859-05:002012-01-22T22:12:22.859-05:00Hey Greg, I'm at the same point as you on my C...Hey Greg, I'm at the same point as you on my CBK20B. I replaced the PS electrolytics and powered it up to just hear some crackles. Looks like I'm restuffing the decoupling caps as well. <br />On your last comment did you mention that you restuffed the caps and it still didn't work?<br />Or are you in the process of restuffing?<br />Let me know, I will be eagerly watching your progress. If I find anything significant I will post again.<br />Thanks and good luck!<br />RobRob D.https://www.blogger.com/profile/15903435326315714833noreply@blogger.com