Steve, for what it's worth I had a very similar problem with the PTO in my R4B sometime ago. I reheated all of the connections on the PTO circuit board and it cured my problem.
73' Jerry K4FJK ----- Original Message ----- From: Steve Wedge To: [email protected] Sent: Thursday, July 28, 2011 9:07 PM Subject: [Drakelist] R-4A PTO: It wasn't the transistors (entirely) Replaced both transistors - the osc with the correct 2N706A and the buffer with a 2N3904 (the '3858's are no longer made and the ones left are stupid-expensive). Unfortunately, it's still jumping around like a five-year-old on a sugar-buzz. Scratch the transistors as the culprits - though the signal quality does sound a little better. Looking at the worm drive/yoke, I'm wondering: how much slop is acceptablebetween the worm drive and the yoke? Mine seems to have a significant amount. I'm also tending back toward capacitors again. that largish brown one: is there anything "special" about it? I've heard at least a couple of reports of that being the culprit. 73, Steve Wedge, W1ES/4 "I can't complain, but sometimes I still do." - Joe Walsh If the above message appears, it came from Steve's Son of Laptop! ------------------------------------------------------------------------------ _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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