Fellow Drake enthusiasts,
Thanks for the posted and private comments regarding the L7. I appreciate all of them. Here's what I found. The 160 meter input coil had a mica capacitor resting against the chassis; not a major issue necessarily. PC style green capacitor in the output circuit had one side resting against the shaft of a sheet metal screw; a problem waiting to happen. One 3-500Z filament pin had desoldered and the other tube was gassy. My guesstimate is that one tube failed, and then the other was loaded "normally" but it was trying to do the job of both tubes and will degrade rapidly. Unlike, the L4 and L4B, you can't see the tubes in the L7 or L75 for that matter. Hence, when a situation like this occurs, it isn't always detected in a timely manner. Thanks again for your comments. Hope to QSO with you on the Drake Technical Net, the Drake and Antique Tube Gear Net, and the Drake Forum at the 2010 Hamvention. 73, Evan, K9SQG
_______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
