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Linear Mode
41-250 oscillator problems
Terry Judkins
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Posts: 91
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Joined: Oct 2005
City: Atlanta GA
#9

02-06-2008, 11:39 AM
justlrnin Wrote:Hello. Newbie here, and I'm also restoring a 41-250 that I just bought over the weekend. (first non-car radio I've restored, only the second tube radio I've touched, but I'm fascinated (obsessed?) by these old radios.)
I have an Eico 666 tube tester with various tube charts, none of which list the 7A4 (XXL) and the 41 tubes, so I can't test them. Anyone happen to know the settings to use to test these tubes on the Eico?

Also, what are the value(s) of the 21 and 21A capacitor? I was just getting ready to order all the caps when I found this forum today and didn't realize that capaitor was paper. I've been reading posts here for the past couple of hours. What a great source of info and expertise!

21 and 21A are listed as 370 uuF (pF). Not a standard value.
Replace with two 360 or 390 pF silver micas. These caps affect the pushbutton tuning.

Can't help with the tube tester settings. I have had weak 7A4 (XXL) tubes though. Watch for shorted 84 rectifier.
Kind regards,
Terry
http://home.comcast.net/~suptjud/
"Life is simpler when you plow around the stump."
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Messages In This Thread
[No subject] - by Terry Judkins - 02-05-2008, 05:43 PM
[No subject] - by Guest - 02-05-2008, 07:53 PM
[No subject] - by electroubleshooter - 02-05-2008, 09:17 PM
[No subject] - by electroubleshooter - 02-05-2008, 09:18 PM
[No subject] - by Terry Judkins - 02-05-2008, 09:31 PM
[No subject] - by electroubleshooter - 02-05-2008, 11:02 PM
[No subject] - by justlrnin - 02-06-2008, 12:15 AM
[No subject] - by Terry Judkins - 02-06-2008, 11:39 AM



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