Philco 650 motorboating

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Philco 650 motorboating

BDM
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Posts: 393
Threads: 40
Joined: Sep 2007
City: St Clair Shores, MI, USA

03-24-2008, 12:03 AM

I've posted this on ARF also. Figure I'll see if those on both sites may know something I obviously don't.

Well, this isn't a big issue. But it annoys me at times. Right around 7/mc it starts to motorboat depending how much antenna is connected. I've tried using a weak 6A7 for less gain, this helped but, it still persist. The vid kind of tells the story. All caps and any out of tolerance resistors have been replaced. Set plays fine other than this. Also, it only occurs from about 6.5/mc straight up to 7.5/mc. No other band does this occur.
http://www.youtube.com/watch?v=FLgucsVPHz8

So, what do you guys think? Thanks gents.

-Brian
If you collect or are interested in antique telephones, please visit Classic Rotary Phones
http://www.classicrotaryphones.com/forum/index.php

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Philco 650 motorboating - by BDM - 03-24-2008, 12:03 AM

[No subject] - by Texasrocker - 03-24-2008, 12:27 AM

[No subject] - by BDM - 03-24-2008, 12:36 AM

[No subject] - by Texasrocker - 03-24-2008, 10:45 PM

[No subject] - by Texasrocker - 03-24-2008, 11:21 PM

[No subject] - by BDM - 03-28-2008, 12:44 PM

[No subject] - by Texasrocker - 03-29-2008, 03:30 AM

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