twystd
I finally finished up with all these projects I was doing for others, and decided to do one for myself. Some time ago, a bud of mine gave me these big old potted filament chokes. I've wanted to try them in my Laurels for months now. I replaced the old stock 10,000 uf caps with some 35V 3,300uf Elnas I've had laying around. I figured it would be enough filtering, with the addition of the choke. Then I mounted the chokes on the sides of the chassis, and wired them in, to replace the resistor that goes between filtering sections on the filament supply. When I tested them, the filament voltage was a little high (5.5V). I'll fix that by putting two .15 ohm Mills resistors in between the schotcky (damn, I can't spell those things) bridges and the transformer winding (one on each leg). That should get me close to 5V. I put my volt meter on the binding post with a 15 ohm resistive load, and measured the hum, stock was .6mv, and after the mod it was .8mv. Hooked them up to the system, and turned them on. First I put my ear next to my 96db speakers, absolute silence, cool! Then I hit play, WOW, definitely makes a difference. The tone sounded so much richer, the bass was more tuneful, and lots of detail on top. To think, the caps aren't even broken in yet. This is a really worthwhile thing to do, made an already musical amp even more so. Hmmmm, now that I got the capacitance lower, maybe I can afford those Blackgates after all.twystd
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