- Posted by twystd (A) on June 26, 2003 at 11:22:44
In Reply to: Re: Choking that filament supply! posted by Choy on June 26, 2003 at 08:16:45:
Hi ChoyGood to hear from you again, guess you're back. Wish I had the software to post a diagram, but don't. It's really simple anyway. Just put the choke pretty much anywhere on the side you can. I have the original power supply choke, a D battery, a 2.5V filament transformer, hum pot, and double pole double throw switch (for my 2.5V AC filament supply), and now the filament chokes, all on the chassis sides. I figure I still have room for another thing or two (man, these things are getting heavy). All you do is slap that choke anywhere you can get it, and run each wire from the choke where either end of the resistor you're replacing in the power supply was soldered (of course the closer the better). It's good if you can get some chokes that have about the same resistance as the resistor you're replacing, so you don't have to tweak the voltage much. I don't know whether it was the choke, the reduced capacitance, or better quality caps that was responsible for the change, quite possibly all three had a factor. After more listening, I like the change even better than at first. This might be the most effective mod yet. Certainly, I'll never make a DC filament supply with a resistor between filter sections again. I can't believe I've had those chokes around for so long, and never installed them. I have 2 more power supply chokes for the Laurels, now that I've heard what the chokes did in the filament supply, really wonder what a choke replacing the resistor in the third filter stage of the power supply would do. Maybe that would richen up the driver stage, guess I'll find out and report back.
twystd
