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It is an interesting driver. I have had little experience with vintage drivers, but i am impressed with the build quality. Treated paper cone, fabric surround, stamped steel basket and a very heavy magnet. The total suspension seems very stiff. |
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The stamped steel basket is pretty run of the mill. |
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You can see some of the stamped ID numbers on the basket and cone. |
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I have seen vented pole pieces before, but i have never seen one in the dust cap itself. There is a little bit of wool covering the hole. The magnet back is completely sealed. |
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Here is a good shot of the fabric surround. |
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Last but not least here are the T/S parameters of the drivers. Re: 10 Ohms Qes: .1728 Qts: .1661 Effciency: 98.80 Qms: 4.3172 Vas: 252.3 Lt Sd: 745 cm2 Fs: 35.78 |
Project Sections:
Heathkit Range Extending SS-1B
1. Jensen P15LS
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