Thanks Gary, I'll be working on the rig some more tonight.
Like I said previouly, I only had 23v on the output. Since the 15v and 16v alignment values on the VCO board were both short by about 1.5v, it was suggested by Jeff C. on the Sunday net I make sure I had 25v going to the VCO in order to get the required 15v and 16v during alignment. I had repaired the transformer core some time back by glueing it back together (top half in two pieces laying on the bottom of the rig), plus glueing both halves securely. I did use super glue sparingly. I now have a second powersupply board to substitute in. It is an "L" board instead of a "W", so its a bit different in layout, but looks to be the same electrically...... Except for a 7k resistor going to ground on the output of the 25v line instead of a 2.7k. I'll see what kind of output I get from it tonight. Anyway,,... My "quest" was to get this newly acquired TR7 to perfection. It won't leave my bench till its right....no puting it aside for later. Then I have a nice R4a waiting in the wings to get lined up! This is probably good troubleshooting stuff for the list, so I'll continue to post regarding my alignment issues. Best Regards, David Wd9cmd ----- Original Message ----- From: Gary Poland To: [email protected] Sent: Tuesday, January 13, 2009 8:30 PM Subject: Re: [Drakelist] TR-7 Power Supply Board Make sure there is no gap between the core halves on the inverter transformer T2102, use hot glue or RTV to hold it in place. There should be close to 30 vdc going into the 78L24 regulator, U2103. I have also replaced C2117 with a .033 and C2115 with a .047 to increase the voltage. Output is typically 23.6vdc or better. 73, Gary W8PU http://home.roadrunner.com/~w8pu ------------------------------------------------------------------------------ _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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