The lower powered Leslies (21H, 44W) put 276V/104mA across the coils, which were wired between the screen supply and the output tube cathodes. The coil DC resistance is nominally 2,650 Ohms cold, rising to 2,800-3,000 as it warms up. In general, they are similar to the Jensen P15LL except for the magnet structure. With limited wattage from power amps and few Alnico V speakers in production, they had to resort to field-coil speakers to get sufficient SPL for large spaces. (You can plug the woofers directly into the amps, bypassing the crossover.) However, in the bass region-with 300V across the coil-a 20W 21H amp with a field-coil woofer will run circles around a 122 with a PM speaker. I've tried running guitar through them via the Leslie amps, but as fifteens, they don't have much high end, not to mention that the Leslie amps have some low-pass filtering built in. I have four Leslies, and three of them use the field-coil Jensen F15LL, which was Don Leslie's personal favorite of all the woofers he tried in his cabinets. As an organ tech, I have access to them for much less than the nutty prices some are paying for them on eBay, and building a stand-alone power supply is easy enough. I'm not going for the magic of obsolete technology I'm just curious as to whether they actually have higher sensitivity than the PM models that followed. I couldnt tell ya.I was wondering if anyone has tried out 1950s field-coil speakers like the Jensen F12N for use with low-powered guitar amps. If it delivers bang for the $ is up to the listener. Yeah certain vintage gear will get crazy money. I'm in the command man fixed magnet drivers for my horn gear.Īnother example that will blow your mind is how much an original working vintage Fairchild 670 tube compressor limiter will fetch. Heck the exotic power supplies owners use to charge the coil often costs an insane amount of $ in addition to the driver itself. And the handful of sites I found showing the goods, none list prices. It's been many years since I kept up on that stuff but it's still being made these days. And were talking stuff with price tags equal to that of a new BMW car. Many years ago I attended a couple audio shows where modern day field coil drivers were being used in some crazy boutique high efficiency horn speakers. $15k is allot of money for a single audio driver. Now we have the pinnacle of uber rare and sought after. It then goes to the next level of being a field coil driver. Some of the most sought after brand vintage audio gear in existence. To shed a bit of light on the high cost I'd cite, its western electric. Click to expand.I dont blame you for asking such a thing.
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