John, W2AGN wrote: I was pleased to complete my T1 yesterday, after receiving a couple of missing 1/8 watt resistors from Elecraft. Everything worked right away. Happy Dance time..
Then today..I receive another envelope from Elecraft with Errata, changing R1 and R2 to 1 watt, and T2 to 2 stacked cores. Oh Joy, now I get to take it all apart, desolder the resistors and T2, all while trying not to melt anything I shouldn't. ------------------------------------------ Hi, John: That change was to beef up the bridge circuit transformer. After really beating up some T1's to see what they'd take, it was found the original transformer can run warm enough to cause the bridge of work incorrectly under some conditions on the lower bands. Those two resistors are very easy to get to. Remove T2 first and you'll find one of them right next to the row of inductors near the BNC end on top of the board, and the other one on the bottom of the board near the edge between the BNC connectors. They are well away from any sensitive relays or other such parts. You'll find T2 with two stacked cores a tight fit, but it does fit FB and will run very cool under all normal conditions on any band. Follow the procedure in the errata in which you solder one end of the green primary winding in before installing the transformer and it'll go in easily. BE SURE to wind T2 with EIGHT turns. I understand that a few of the errata sheets may have escaped saying seven by mistake. That transformer gets EIGHT turns just as shown in the picture and the same as in the original T2 you are removing. Now your T1 will be even more robust than ever. In spite of the embarrassment and cost to Wayne and Eric to deliver a change so quickly, it wasn't an option to ignore that weakness in the T1. It's now the Elecraft way. Indeed, they were scrambling over the holiday weekend to get the change out ASAP. You get a stronger, better tuner as a result. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
