Scott 800B - Tweeter - EH Scott Radio Enthusiasts2024-03-28T18:42:40Zhttps://ehscott.ning.com/forum/topics/scott-800b-tweeter?commentId=3925821%3AComment%3A56585&x=1&feed=yes&xn_auth=noNorman,
I tested with 1uf and…tag:ehscott.ning.com,2017-02-21:3925821:Comment:565852017-02-21T22:59:48.842ZJosé Bustoshttps://ehscott.ning.com/profile/JoseBustos
<p>Norman,</p>
<p>I tested with 1uf and 2uf new capacitors. If the level of trebles would be the same between my compression driver and a cone tweeter, the coil reparation was not good. I will check again.</p>
<p>Thank you and regards,</p>
<p>José</p>
<p></p>
<p>J</p>
<p>Norman,</p>
<p>I tested with 1uf and 2uf new capacitors. If the level of trebles would be the same between my compression driver and a cone tweeter, the coil reparation was not good. I will check again.</p>
<p>Thank you and regards,</p>
<p>José</p>
<p></p>
<p>J</p> Jose:
The HNP speaker should…tag:ehscott.ning.com,2017-02-21:3925821:Comment:567752017-02-21T15:33:29.659ZNorman S Braithwaitehttps://ehscott.ning.com/profile/NormanSBraithwaite
<p>Jose:</p>
<p>The HNP speaker should sound similar to the JNP with extended high frequency range (able to produce slightly higher frequencies than JNP). The efficiency of the tweeters should be about the same. If not, there is likely a problem with the tweeter or crossover capacitor. We call the type of tweeter on the HNP a compression driver.</p>
<p>Norman</p>
<p>Jose:</p>
<p>The HNP speaker should sound similar to the JNP with extended high frequency range (able to produce slightly higher frequencies than JNP). The efficiency of the tweeters should be about the same. If not, there is likely a problem with the tweeter or crossover capacitor. We call the type of tweeter on the HNP a compression driver.</p>
<p>Norman</p> Hello Norman,
I could fix the…tag:ehscott.ning.com,2017-02-20:3925821:Comment:567702017-02-20T19:31:30.032ZJosé Bustoshttps://ehscott.ning.com/profile/JoseBustos
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">Hello Norman,</span></p>
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">I could fix the tweeter replacing with a new 1" coil, 8ohm.…</span></p>
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">Hello Norman,</span></p>
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">I could fix the tweeter replacing with a new 1" coil, 8ohm.</span> <span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">Unfortunatelly , I have a new problem.</span></p>
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">I have the optional Jensen series HNP dual coaxial speaker with internal horn tweeter placed on the backside of the big speaker. The tweeter does not have cone, just the coil mounted on a flat circle cardboard (dome tweeter?).</span></p>
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">The level of the trebles is low and is covered with the sound of the big speaker. Using an alternative tweeter with cone like the used on the JNP series (with a coaxial mounted cone tweeter), I can ear the trebles clearly and high. I could use this kind of tweeter instead, but I must take the decision, because it will not be like the original design. Do you ear differences on the tweeter level comparing the Jensen series HNP and the JNP series. Any comments or hints will be very welcome.</span></p>
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">Thank you and regards.</span></p>
<p><span lang="EN-US" style="color: black; font-family: 'Lucida Sans Unicode','sans-serif'; font-size: 10pt; mso-ansi-language: EN-US;" xml:lang="EN-US">José</span></p>
<p><br/> <br/> <cite>Norman S Braithwaite said:</cite></p>
<blockquote cite="http://ehscott.ning.com/forum/topics/scott-800b-tweeter?id=3925821%3ATopic%3A44363&page=1#3925821Comment44146"><div><div class="xg_user_generated"><p>6-ohms DC. The nominal voice coil impedance would be 8-ohms.<br/> Norman</p>
</div>
</div>
</blockquote> Hello,
I fixed the tweeter fi…tag:ehscott.ning.com,2017-02-13:3925821:Comment:565362017-02-13T19:46:30.125ZJosé Bustoshttps://ehscott.ning.com/profile/JoseBustos
<p>Hello,</p>
<p>I fixed the tweeter finally. I bought a new 1" coil dome and replaced the burned. The tweeter is working great now.</p>
<p>Kindest regards,</p>
<p>José</p>
<p></p>
<p>Hello,</p>
<p>I fixed the tweeter finally. I bought a new 1" coil dome and replaced the burned. The tweeter is working great now.</p>
<p>Kindest regards,</p>
<p>José</p>
<p></p> Norman:
Excellent!! Great he…tag:ehscott.ning.com,2014-05-28:3925821:Comment:441472014-05-28T17:30:35.862ZJosé Bustoshttps://ehscott.ning.com/profile/JoseBustos
<p>Norman:</p>
<p>Excellent!! Great help. I will get my head down on this.</p>
<p></p>
<p>I will let you the advances.</p>
<p></p>
<p>All the best and kind regards,</p>
<p></p>
<p>José</p>
<p>Norman:</p>
<p>Excellent!! Great help. I will get my head down on this.</p>
<p></p>
<p>I will let you the advances.</p>
<p></p>
<p>All the best and kind regards,</p>
<p></p>
<p>José</p> 6-ohms DC. The nominal voice…tag:ehscott.ning.com,2014-05-28:3925821:Comment:441462014-05-28T16:34:08.236ZNorman S Braithwaitehttps://ehscott.ning.com/profile/NormanSBraithwaite
<p>6-ohms DC. The nominal voice coil impedance would be 8-ohms.<br/> Norman</p>
<p>6-ohms DC. The nominal voice coil impedance would be 8-ohms.<br/> Norman</p> Jose:
I have one of these opt…tag:ehscott.ning.com,2014-05-28:3925821:Comment:442852014-05-28T15:03:51.923ZNorman S Braithwaitehttps://ehscott.ning.com/profile/NormanSBraithwaite
<p>Jose:</p>
<p>I have one of these optional speakers in my 800B. I will measure the tweeter voice coil DC resistance and report back after attending a meeting this morning.</p>
<p>Norman</p>
<p>Jose:</p>
<p>I have one of these optional speakers in my 800B. I will measure the tweeter voice coil DC resistance and report back after attending a meeting this morning.</p>
<p>Norman</p> David:
It seems there is an…tag:ehscott.ning.com,2014-05-28:3925821:Comment:444762014-05-28T00:35:02.872ZJosé Bustoshttps://ehscott.ning.com/profile/JoseBustos
<p>David:</p>
<p></p>
<p>It seems there is an misunderstanding. The coil that is cutted is not the field coil, is the móvil coil of the tweeter. My speaker has permanent magnet.</p>
<p></p>
<p>I am trying to know the DC resistance for the small móvil coil of the tweeter in order to rebuild it.</p>
<p></p>
<p>However all your tips are very useful for my proposal.</p>
<p></p>
<p>Thank you very much and kind regards,</p>
<p></p>
<p>José</p>
<p>David:</p>
<p></p>
<p>It seems there is an misunderstanding. The coil that is cutted is not the field coil, is the móvil coil of the tweeter. My speaker has permanent magnet.</p>
<p></p>
<p>I am trying to know the DC resistance for the small móvil coil of the tweeter in order to rebuild it.</p>
<p></p>
<p>However all your tips are very useful for my proposal.</p>
<p></p>
<p>Thank you very much and kind regards,</p>
<p></p>
<p>José</p> Jose,
Don't guess. Just look…tag:ehscott.ning.com,2014-05-27:3925821:Comment:442832014-05-27T03:29:06.565ZDavid C. Polandhttps://ehscott.ning.com/profile/DavidCPoland
<p>Jose,</p>
<p>Don't guess. Just look carefully at the circuit diagram, in particular the portion for the speaker. Trace out your speaker wiring to the speaker plug in order to determine which pins on the plug connect to the bad field coil. That should tell you which coil is bad and hence the value for the field coil you rewind. The resistance of the field coil is determined by both the gage (wire diameter) and the total length of the wire. Don't guess on the wire gage, measure it so you can…</p>
<p>Jose,</p>
<p>Don't guess. Just look carefully at the circuit diagram, in particular the portion for the speaker. Trace out your speaker wiring to the speaker plug in order to determine which pins on the plug connect to the bad field coil. That should tell you which coil is bad and hence the value for the field coil you rewind. The resistance of the field coil is determined by both the gage (wire diameter) and the total length of the wire. Don't guess on the wire gage, measure it so you can duplicate the field coil.. Also, the new coil you make still has to fit the available space.</p>
<p>The two field coils do different jobs in the radio. The 675 ohm field coil you asked about was specified by the engineer who designed the radio power supply. That 675 ohm coil achieves the desired voltage drop in the high voltage circuit and helps filter the high voltage to eliminate 60 cycle hum, and also powers the magnetic field for the speaker.</p> David:
For the quantity of wi…tag:ehscott.ning.com,2014-05-27:3925821:Comment:444692014-05-27T00:36:23.659ZJosé Bustoshttps://ehscott.ning.com/profile/JoseBustos
<p>David:</p>
<p>For the quantity of wire of my coil I believe could be 675 ohms. Your tips will be very useful to me.</p>
<p></p>
<p>By the way, Why 675 ohms?</p>
<p></p>
<p>Thank you very much,</p>
<p></p>
<p>José</p>
<p>David:</p>
<p>For the quantity of wire of my coil I believe could be 675 ohms. Your tips will be very useful to me.</p>
<p></p>
<p>By the way, Why 675 ohms?</p>
<p></p>
<p>Thank you very much,</p>
<p></p>
<p>José</p>