re cone a phantom speaker - EH Scott Radio Enthusiasts2024-03-29T09:55:47Zhttps://ehscott.ning.com/forum/topics/re-cone-a-phantom-speaker?commentId=3925821%3AComment%3A122225&x=1&feed=yes&xn_auth=noNice presentation. That same…tag:ehscott.ning.com,2022-03-24:3925821:Comment:1222252022-03-24T00:45:17.658ZDavid C. Polandhttps://ehscott.ning.com/profile/DavidCPoland
<p>Nice presentation. That same speaker is used for the Scott model Sixteen and the 14 tube Scott Masterpiece and 19 tube Phantom (NOT 20 tube Phantom DELUXE, nor FM Phantom Deluxe). It uses a curved cone. Octal plug. It has two field coils - one for B+ and one in the negative voltage bias circuit.</p>
<p>I have had several of this model Scott Magnavox speaker and running about 50% with bad output transformer. Due to the 38 ohm impedance voice coil (VTVM resistance about 31 ohms) and 6V6 output…</p>
<p>Nice presentation. That same speaker is used for the Scott model Sixteen and the 14 tube Scott Masterpiece and 19 tube Phantom (NOT 20 tube Phantom DELUXE, nor FM Phantom Deluxe). It uses a curved cone. Octal plug. It has two field coils - one for B+ and one in the negative voltage bias circuit.</p>
<p>I have had several of this model Scott Magnavox speaker and running about 50% with bad output transformer. Due to the 38 ohm impedance voice coil (VTVM resistance about 31 ohms) and 6V6 output tubes, I found no suitable universal output transformer which max out at a 16 ohm speaker. But can modify the Hammond 15 watt universal 125-E by adding additional turns (18 gage magnet wire is about right) to lug 6 and the far end becomes "lug #7". Then the voice coil is attached to lug #1 and the new lug #7. It takes about 12 feet of wire to add 24 turns. The purpose is to further reduce the primary to secondary turns ratio to accommodate the 38 ohm voice coil. </p>
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<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/10233403287?profile=original" target="_blank" rel="noopener">DSCF3927.JPG</a></p>
<p></p> Awesome tutorial Mike! I have…tag:ehscott.ning.com,2022-03-23:3925821:Comment:1222902022-03-23T02:55:11.175ZBrad Winderhttps://ehscott.ning.com/profile/BradWinder
<p>Awesome tutorial Mike! I have started to learn to re-cone speakers, having done three smaller ones so far. Two turned out well...one not so good. But I will keep trying, and use a couple of your tips. :)</p>
<p>Awesome tutorial Mike! I have started to learn to re-cone speakers, having done three smaller ones so far. Two turned out well...one not so good. But I will keep trying, and use a couple of your tips. :)</p>