PrataBas

anli skrev:Hm... har ögona på en sjuttiotals Guild JS-2 (med guilds egna), vore fräckt att köpa basen och stoppa i Darkisarna.

GrafZeppelin skrev:Om jag förstått saken rätt så är Darkstar-mikarna direkta replikor.

Question:
Are Dark Stars exactly like to original Hagstrom pickups?

Answer:
No. When I first approached this project I was obsessed with detail. I took carefull measurments as I reverse engineered the original Hagstrom pickups that I used as models. As time went on I became more familiar with the function and "logic" of it's construction.

One of the first things I noticed was that there were at least 3 different methods that Hagstrom used to mount connection terminals over the years. I found all of them "wanting" in some way. The terminal location seemed to be an after-thought to the design. One of the methods caused the plastic bobbin to melt when I tried to remove the old wire. Rick Turner encouraged me to make improvements where ever I could and suggested that I mold the bobbin from tougher and more heat resistant Lexan. I was then able to press mount terminal posts right on the bobbin itself.

Other improvements include using thinner and better insulated steel laminations in the bobbin core. I was able to put 8 laminations instead of 5 in the same space. This is to better reduce eddy currents and hysteresis loss which can limit high frequency. If you're really interested in this stuff check this out.
http://leeh.ee.tut.fi/transformer/tra232.htm
Dark Stars are a work in progress. I'm still experimenting with different coil wire gauges and DC resistance values but for now I think I've got a pretty good formula. Look for low impedance models in the future.