gonzo
Well-known member
Finished this up this week. This is my slightly tweaked version of an emulation or recreation of the drive gain circuit of a Silvertone 1484. There are a bunch of schematics of these online. Looks like something Run Off Groove would post. I can't figure out where it originated from. It's a fairly accurate depiction of the Silvertone amp circuit. A bunch of companies have taken the idea and ran with it. Recently Jackson audio put out a version and JHS did a Silver Twin Twelve. It goes by Argentum, a board sold on here. However that board only has 3 jfets. Which actually might be all you really need as I had to bias the last jfet to get rid of a bunch of noise. Seems to not really be doing much. All other jfets where biased to 9 volts. I added the resistor to ground on the gain pot as the Argentum does, so the volume doesn't cut at zero. I also changed the resistors coming into the bass pot on legs 1 and 3 (not pictured). The 100k resistor to a 1k and the 68k to a 27k. The bass knob now does something audible.
I compared it to my IRs and amp sims of the original. While it doesn't really sound exactly the same or completely act the same, it is in the ballpark of as to the character of the original amp. Nevertheless, it's a cool sounding drive, which can do clean boost, overdrive, to full on fuzz. It's definitely unique. Forgive my lazy graphics. I just can't be bothered painting them anymore. Just polished an old enclosure and used a marker.
I compared it to my IRs and amp sims of the original. While it doesn't really sound exactly the same or completely act the same, it is in the ballpark of as to the character of the original amp. Nevertheless, it's a cool sounding drive, which can do clean boost, overdrive, to full on fuzz. It's definitely unique. Forgive my lazy graphics. I just can't be bothered painting them anymore. Just polished an old enclosure and used a marker.
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