I think you are on the right track. I just read all the comments so far and was going to jump in with a discussion on how Astron power supplies were not always so radio-friendly. The older ones (I have a very old one, circa 1985) that has very little bypassing and is quite prone to making my radio do all sorts of crazy things. I have not installed the parts yet, but have collected what I needed to upgrade the PS to match the later schematics. The website repeater-builder.com that Dave mentioned has a wealth of information on fixing these power supplies up even further, and there is a replacement regulator board available, too.
Dave, we look forward to the results of your mods, especially the pass transistor swap, and the specifics of what you accomplish. Good luck! 73, Eric KA8FAN ________________________________ From: James Cobb <[email protected]> To: [email protected] Sent: Tuesday, February 17, 2009 12:32:01 PM Subject: [Drakelist] Astron RS-35M and TR-7 Guys, Just thought I'd follow up. I appreciate everybody's advice. I've ordered new (higher-capacity) pass transistors and a new higher-cap bridge for my Astron, so I'm going to see if this corrects the problem I'm experiencing before I buy a new power supply. The Astron info on repeater-builder.com is excellent. When I open it up, I'm going to check some other things like the 723 compensation cap, grounding, and so on. We'll see how that goes. 73, Dave / K8JDC
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