19lz shadow meter

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19lz shadow meter

Chuck Schwark
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Posts: 1,703
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Joined: Sep 2005
City: Evanston, IL

05-31-2008, 11:11 PM

The Shadow Meter does, indeed, respond to AVC action, indirectly as the front-end tube's plate current swings. The meter is in the B+ line to these tubes. Therefore, unless the set is accurately aligned and has a suitable antenna, the average AVC voltage will not be lage enough to show a reasonable shadow movement. Also, due to age, the bias magnet in the shadow meter may be weak and also contribute to "weak" movement.

See the Service Tips page on the Shadow Meter on my site.

Chuck

Chuck Schwark,
The Philco Repair Bench
[Image: http://www.philcorepairbench.com/images/philog3tiny.gif]
http://www.philcorepairbench.com

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Messages In This Thread

19lz shadow meter - by philco phan - 05-31-2008, 07:56 PM

[No subject] - by Chuck Schwark - 05-31-2008, 11:11 PM

[No subject] - by philco phan - 06-01-2008, 12:16 AM

[No subject] - by Ron Ramirez - 06-01-2008, 11:31 AM

[No subject] - by philco phan - 06-01-2008, 12:34 PM

[No subject] - by Ron Ramirez - 06-01-2008, 01:43 PM

[No subject] - by Texasrocker - 06-04-2008, 01:52 AM

[No subject] - by philco phan - 06-04-2008, 01:07 PM

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