I assume you are referring to T2302, there are no 28xx parts on the PA deck. I suspect what you are seeing is one of the lead wires from T2302, which is part of the RF filtering system for the collector voltage to the drivers. It looks to be bifilar wound, so yes, a break in the common lead would kill 13.6 to both of the drivers. It looks like to get to it you would need to remove T2303. Not an easy task, but do-able. I don't have one in front of me, just looking at SM pictures right now. Once you can get to it, it shouldn't be a big deal to either patch the broken lead or re-wind it.
73 -Jim NU0C On Fri, 21 Mar 2014 16:21:32 -0600, J. Steven Cochrane wrote: >I have two TR7 questions: > >1. There is a VERY fine wire, like fuse wire, that runs next to T2802 toroid >(side closest to the final amp stage), it is broken. Could that be why I don't >have 13.6 volts going to the Driver Transistors (there is 13.6 volts at the >Test Jumper for the Bias Measurement)? The toroid doesn't look all that good >either, but neither does the one in my good TR7. > >2. Does anyone know of an easy way to replace that wire and T2802 if necessary? > >If anyone has a working PA board they would like to sell I'm interested. > >Steve >J. Steven Cochrane W7JSC > > -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
