I am currently restoring my old 030 systems. So, I thought I would take the extra time to document a few things. The N2400 crossovers pictured below were purchased in 1973 for $23.00 each and have serial numbers of 37510 and 38634. Since, the L-Pads were in really bad shape, I decided I would open up the boxes and inspect everything. To open the boxes, the heads of 4 rivets were very carefully drilled off. This allowed the back covers to be removed. Upon inspection, I turned up a few surprises. First, I was surprised by just how small the coils were in size, with only 20 gauge wire. Second, the coils had a different part number, then what was described in N2400 circuit schematic. So, I have revised the N2400 schematic below to show the differences that I found. Also worth noting in the #38634 N2400 crossover, the 5 ohms were 10 watt instead of the 11 watt size. The pictures below are of the #37510 N2400 crossover, which has the larger 11 watt resistors. In testing the N2400 crossovers, the #10421 coils had inductance values of 1.057mH and 0.997mH and all of the #10296 caps had values that varied between 6.1uF and 6.2uF of capacitance. Considering that the caps are 36 year old, I am pleasantly surprised by how well they have held up.
Baron030
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