Hi all,I recently picked up a pair of Jensen F-12-NS speakers and I would like to ask a couple of questions about them. First, there is a 1/4" fine crack in the cone where it turns into the surround. What is the best adhesive to seal and strengthen this with? Second, they have DC resistances of 5000 and 250 ohms and it would be more convenient to be able to run them from one voltage source, but I haven't been able to find good information on the web for calculating wire sizing and other parameters for winding iron core coils. My understanding is that the current carrying capacity in a coil is different than in free air. Can anyone suggest a good source of information on this? When I tried to measure the inductance of the coils I came up with approx. 4.5 H for the 250 ohm and something around 65 H for the 5k, does this seem ballpark? I estimated (guessed) that these speakers should be capable of 15 W of output given that the old Hammond amps I've seen on ebay run 4 to 8 6V6 output tubes. The limited information I have states that the power dissipation in the field coil should be 100-140% of the undistorted output power so that gives around a 65V drop and 230 mA on the 250R and 275V and 55 mA on the 5k. Seem right?
Lastly, I've seen it suggested on this forum that these might be good in a front loaded horn or on an open baffle, but I didn't find any success stories or specific designs. What designs has anyone tried and did they work well or not?
Thanks for any information you can pass on to me.
Michael
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