Garey is correct never put tube shields on those two tubes. That TX driver tube with the shield in place can easily overheat and short out and usually burns a resistor.
I was told by a Drake engineer many years ago that they used that style tube socket because they needed shielding around the base of those tubes. That tube socket style provided that shielding that was needed and Drake never intended to use a tube shield over either tube. Ron / WB4HFN -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Garey Barrell Sent: Sunday, February 26, 2012 8:57 PM To: m coffey Cc: [email protected] Subject: Re: [Drakelist] Tube shields Mike - These tubes should NOT have shields on them. The shield base is enough shielding and adding the shield only increases the heat, decreases the tube life. Leave them OFF. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs <www.k4oah.com> m coffey wrote: > I am cleaning up a TR4 for a friend and have noticed that the shields > are missing on v6 and v7, although the shield bases are in place. > Interestingly, the shields are missing in the chassis photo in the > manual on the BAMA site. Anyone know how critical these two shields > are? I would think that Drake would not have put them in there if they > weren't necessary. Also, does anyone have a pair of these that they > are willing to part with? The V6 shield is for a 7 pin and the V7 is a > 9 pin (wider and taller). Mike _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
