[R-390] Re: Tube shields? We don’t need no steenkin' tube shields!

[Barry Williams]

I found this:


From: Dr. Gerald N. Johnson, P.E. <geraldj at ames.net>
Reply-To: "Dr. Gerald N. Johnson, P.E." <geraldj at ames.net>
Organization: Gerald N. Johnson, P.E.
To: John Multer <multerj at bytehead.com>
Cc: Thomas Roth <th.roth at knuut.de>, <R-390 at qth.net>
Date: Sunday, December 5, 1999 3:34 PM
Subject: Re: [R-390] Shields or no shields...

The receiver has two RF stages to keep down radiation. So shielding them
should be important for keeping the receiver private. Same thing for the
oscillators. Its important to not let signal radiate from the later IF
stages because they can lead to IF oscillation. Some of these IF tubes
do have a shield outside the plate, and some don't (6AK5 doesn't).

73, Jerry, K0CQ

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Barry