This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --222610757-359730333-1035950401=:1140 Content-Type: TEXT/PLAIN; charset=US-ASCII Hi, I just picked up a used radio with a power supply problem. It's an 80s-vintage rig with a relatively simple but not too great power supply section. Specifically, it's a Kenwood TS-930S with a 307xxxx serial number. Where I should have 28.5V adjustable I get 33V non-adjustable, which of course some parts of the radio are not too happy with. I find all sort of documentation for fixing higher serial numbered rigs, which have substantially different (but still not great) power supply designs. Nothing for one this old, though. Rather than fix what is a known to be a poor design to begin with, how does this look for a 28V supply? T1/T2 and R1/R2 are reused as is from the original. In the original, though, there are two transistors, a Zener, a pot and a few other odds and ends driving the bases of T1 & T2. I don't see a compellign reason not to use a more modern voltage regulator, am I missing something? Dale --- We are Dyslexia of Borg. Fusistance is retile. Your ass will be laminated. --222610757-359730333-1035950401=:1140 Content-Type: IMAGE/png; name="pwrsupply.png" Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: attachment; filename="pwrsupply.png" iVBORw0KGgoAAAANSUhEUgAAAogAAAHiCAIAAADkrKpMAAAUOUlEQVR4nO3d 3XKjxgJGUXFq3hvx5JwLEsKAQAj98HWzViVVlmzJhIy9pxtomr7vbwBAhv+d vQEAwH+EGQCC/Dl7A4DHuq5r23b6cPx4+jxQGWGGAiwjrc1QK1PZkG6Z4bZt pwNooCbCDABBhBnSGR/DpQgzlEenoWKNBUYg07K+w5FmZ35B3YQZAIKYygaA IMIMAEEsMAK5Zqt9WfwLrkCYIdT2al9OAYNamcoGgCDCDABBhBkAgggz5BrP 9ho+mD0EqmSBEYg2NHg8z2v2EKiPMANAEFPZABBEmCFa13XTI8qzh0B9hBly DauIjGt+zR4CVXKMGUJZ+QuuyYgZAIIIMwAEEWYACCLMEGp6ktdwRHn28LxN A77IyV8QzcpfcDXCDABBTGUDQJA/Z28A8NjywuXxY1PZUDFhhgJYXQSuw1Q2 pFtm2KqcUDFhBoAgwgzpjI/hUoQZyqPTUDHXMUOoZX2HI83O/IK6CTMABDGV DQBBhBkAglhgBEI9PcPLkWaokmPMUBg3mIK6GTFDMSQZrsAxZkixPXc9XCWl ylA9I2b4nWMLgxgow6UIM/zOsLjmWmKX2ZZkuKC/wtx0zfRh3/bj8+PH0y9e PvnU8lXTbzr91MOvnG7Sw019+rZwru02T42dXhtnCzZU6cFZ2Wvt3Mjk3m+2 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