L4 PS Harbach conversion https://bfreebandingtalktheplanet.runboard.com/t4446 Runboard| L4 PS Harbach conversion en-us Fri, 29 Mar 2024 01:13:44 +0000 Fri, 29 Mar 2024 01:13:44 +0000 https://www.runboard.com/ rssfeeds_managingeditor@runboard.com (Runboard.com RSS feeds managing editor) rssfeeds_webmaster@runboard.com (Runboard.com RSS feeds webmaster) akBBS 60 Re: L4 PS Harbach conversionhttps://bfreebandingtalktheplanet.runboard.com/p27668,from=rss#post27668https://bfreebandingtalktheplanet.runboard.com/p27668,from=rss#post276681500w is way too much, but its like having an R1 on the road nondisclosed_email@example.com (yamanx1)Sat, 14 Sep 2019 13:57:06 +0000 Re: L4 PS Harbach conversionhttps://bfreebandingtalktheplanet.runboard.com/p27666,from=rss#post27666https://bfreebandingtalktheplanet.runboard.com/p27666,from=rss#post27666Hi Dave.  Congrats on sorting ur ps. I too have handled  High Volts on Radio's/TV's ie. CRT tubes in  '50/60s. Why do U need 1500w? Are u trying to  Contact Aliens on Exoplanets 110 mil light   yrs away. I've never used more than 100w in  60yrs of operating radio's Qrp is fun & a  Challenge. 73's Mike 855.nondisclosed_email@example.com (Vendee85)Sat, 14 Sep 2019 11:37:34 +0000 L4 PS Harbach conversionhttps://bfreebandingtalktheplanet.runboard.com/p27650,from=rss#post27650https://bfreebandingtalktheplanet.runboard.com/p27650,from=rss#post27650Well about a year or so ago my L4B Drake Linear amplifier went kaboom! It kind of is the reason I haven't been as active as I would normally be. I just turned it all off, turned out the lights and got on with other things. Gutted. Then I thought, lets have a go at getting it fixed. Well I contacted everyone I could find on the internet to help me. No-one. So lets get it on the bench and have a look, now this is dangerous stuff, very high voltages, and it really is best to know what you are doing. My knowledge is even more dangerous, because I have some, but not really enough. Never-the-less, I have a good look to at least see if I could "see" the problem. I thought I could, I replaced the 50k ohm resistors and the .82 safety one which was clearly damaged. It never came on, each time I switch the power supply on the 13amp fuse went within a millisecond. Doh! Put it away then. So I've got an expensive non-working linear. Not acceptable, there must be a way and information out there to carryout repairs. I hit the internet in earnest. I bought a Harbach power supply kit from the USA, set myself up on the bench, built it, fitted it, checked it. It worked, I now have a fully functioning Drake L4B linear amplifier, good for around 1500 watts It has taken me quite a while to, get myself properly organised, get the parts and get around to doing the job. I have made a neat and tidy job as well nondisclosed_email@example.com (yamanx1)Tue, 10 Sep 2019 16:50:33 +0000