At 08:57 PM 06/20/10, you wrote: >Thanks to all who replyed to my question on the Astron. >Mike, I did not check the box on the 404 Error, but Chuck sent me a >copy of the schematic and when I returned to the site they all opened. >Thanks for the heads up on the Astron Page, I am re-reading as I >don't think I have the Cap. you mentioned.I also have to check to >see if Negative Stud is insulated from the case. >I replaced the 1000 Uf Electrolytic and it took off. Any of the >suggestions, i.e. Loose Screw on the filter Cap. or a Bad filter Cap >after 20 years could have been the problem. >Again thank you all for the information. Now to fine tune it before >I cover it up again. > >73 JIM KA2AJH Wellsville, NY
You're welcome. I suggest you go down the mod list on the introductory page. At a minimum I'd: 1) put split (lock) washers on the pass transistors and on the filter caps. 2) Verify that the power cord green wire is grounded to the case. Put a star washer between the lug and the case and tighten it snugly so the edges of the points of the stars bite into the case and into the lug. This is a safety issue and your survivors will thank you. 3) Make sure the power cord and the fuse holder is wired so that the hot (black) wire in the cord goes to the power switch and then to the center pin of the fuse holder. The barrel (the outer sleeve) of the of the fuse holder (nearest the case) goes to the transformer. This is another safety issue. I am not the only person who has been zapped because the AC hot wire had been wired to the sleeve of the fuse holder. The issue is that when you pull a good fuse out of the holder the tip of the fuse will touch the sleeve contact in the holder and if your other hand is on the case of the equipment... ZAP ! 4) Add the compensation cap. Just remove the 723 chip from it's socket and solder it across the back of the board, then reinstall the chip. 5) Float the negative side of the supply off the case. None of these five changes cost significant time or money. Mike WA6ILQ
