Scott Allwave 23 Restoration - EH Scott Radio Enthusiasts2024-03-29T08:42:50Zhttps://ehscott.ning.com/forum/topics/scott-allwave-23-restoration-1?commentId=3925821%3AComment%3A74771&xg_source=activity&feed=yes&xn_auth=noThanks Kent
I will follow you…tag:ehscott.ning.com,2019-11-01:3925821:Comment:748652019-11-01T12:19:47.866ZJohn Perryhttps://ehscott.ning.com/profile/JohnPerry
<p>Thanks Kent</p>
<p>I will follow your advice.</p>
<p>John<br></br> <br></br> <cite>Kent King said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/scott-allwave-23-restoration-1#3925821Comment74666"><div><div class="xg_user_generated"><p>When replacing the 3 wires running from the switch assembly in the center can to the SW coils...I find it is easiest to carefully remove the switch rotor, unscrew the phenolic plate and unsolder/replace the wires away from the set, then pass them…</p>
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<p>Thanks Kent</p>
<p>I will follow your advice.</p>
<p>John<br/> <br/> <cite>Kent King said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/scott-allwave-23-restoration-1#3925821Comment74666"><div><div class="xg_user_generated"><p>When replacing the 3 wires running from the switch assembly in the center can to the SW coils...I find it is easiest to carefully remove the switch rotor, unscrew the phenolic plate and unsolder/replace the wires away from the set, then pass them through the 3 holes and reassemble the switch. Much easier than trying to solder new wires in with the switch assembled and screwed down. Just be sure to get everything back as it was and try not to move the bandswitch throughout the process. </p>
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<p>Also, the antenna wires...can't be easily removed, and unsoldering could melt the old insulation in the sheath. If they aren't shorting right at the ends, I leave them alone. If they are shorting to the sheath, I've had some luck cleaning it up and pushing some spaghetti over the ends and sealing off with shrink tubing.</p>
<p>Kent</p>
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</blockquote> When replacing the 3 wires ru…tag:ehscott.ning.com,2019-11-01:3925821:Comment:746662019-11-01T12:13:35.388ZKent Kinghttps://ehscott.ning.com/profile/KentKing
<p>When replacing the 3 wires running from the switch assembly in the center can to the SW coils...I find it is easiest to carefully remove the switch rotor, unscrew the phenolic plate and unsolder/replace the wires away from the set, then pass them through the 3 holes and reassemble the switch. Much easier than trying to solder new wires in with the switch assembled and screwed down. Just be sure to get everything back as it was and try not to move the bandswitch throughout the…</p>
<p>When replacing the 3 wires running from the switch assembly in the center can to the SW coils...I find it is easiest to carefully remove the switch rotor, unscrew the phenolic plate and unsolder/replace the wires away from the set, then pass them through the 3 holes and reassemble the switch. Much easier than trying to solder new wires in with the switch assembled and screwed down. Just be sure to get everything back as it was and try not to move the bandswitch throughout the process. </p>
<p></p>
<p>Also, the antenna wires...can't be easily removed, and unsoldering could melt the old insulation in the sheath. If they aren't shorting right at the ends, I leave them alone. If they are shorting to the sheath, I've had some luck cleaning it up and pushing some spaghetti over the ends and sealing off with shrink tubing.</p>
<p>Kent</p> That is reasonable. That is…tag:ehscott.ning.com,2019-11-01:3925821:Comment:747722019-11-01T00:19:26.651ZNorman S Braithwaitehttps://ehscott.ning.com/profile/NormanSBraithwaite
<p>That is reasonable. That is pretty much what I would do.</p>
<p>Norman </p>
<p>That is reasonable. That is pretty much what I would do.</p>
<p>Norman </p> Ok thanks
Maybe I will just r…tag:ehscott.ning.com,2019-10-31:3925821:Comment:746652019-10-31T23:26:10.704ZJohn Perryhttps://ehscott.ning.com/profile/JohnPerry
<p>Ok thanks</p>
<p>Maybe I will just replace the dog bones and leave the others if they are reasonably in tolerance.<br></br> <br></br> <cite>Norman S Braithwaite said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/scott-allwave-23-restoration-1#3925821Comment74771"><div><div class="xg_user_generated"><p>The dog bone resistors used by Scott in the earlier AW-23 sets are very unreliable. The cylindrical resistor is a carbon film resistor that is usually very reliable. The carbon…</p>
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<p>Ok thanks</p>
<p>Maybe I will just replace the dog bones and leave the others if they are reasonably in tolerance.<br/> <br/> <cite>Norman S Braithwaite said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/scott-allwave-23-restoration-1#3925821Comment74771"><div><div class="xg_user_generated"><p>The dog bone resistors used by Scott in the earlier AW-23 sets are very unreliable. The cylindrical resistor is a carbon film resistor that is usually very reliable. The carbon film resistors fail open.</p>
<p>Norman</p>
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</blockquote> The dog bone resistors used b…tag:ehscott.ning.com,2019-10-31:3925821:Comment:747712019-10-31T15:56:14.249ZNorman S Braithwaitehttps://ehscott.ning.com/profile/NormanSBraithwaite
<p>The dog bone resistors used by Scott in the earlier AW-23 sets are very unreliable. The cylindrical resistor is a carbon film resistor that is usually very reliable. The carbon film resistors fail open.</p>
<p>Norman</p>
<p>The dog bone resistors used by Scott in the earlier AW-23 sets are very unreliable. The cylindrical resistor is a carbon film resistor that is usually very reliable. The carbon film resistors fail open.</p>
<p>Norman</p> Thanks Norman
On the photo wi…tag:ehscott.ning.com,2019-10-31:3925821:Comment:749702019-10-31T14:33:42.705ZJohn Perryhttps://ehscott.ning.com/profile/JohnPerry
<p>Thanks Norman</p>
<p>On the photo with the if diode assembly. the 1k ohm (#367) is a dog bone measures 1.6k </p>
<p>The other resistor looks like a large brown carbon one but marked like a dog bone it should be 10 k (#373) and shows 8700. I assume thats the type failed to open?</p>
<p>Maybe Ill replace the dog bone and leave that one alone especially since its lower and not higher in value.</p>
<p>John<br></br> <br></br> <cite>Norman S Braithwaite said:…</cite></p>
<p>Thanks Norman</p>
<p>On the photo with the if diode assembly. the 1k ohm (#367) is a dog bone measures 1.6k </p>
<p>The other resistor looks like a large brown carbon one but marked like a dog bone it should be 10 k (#373) and shows 8700. I assume thats the type failed to open?</p>
<p>Maybe Ill replace the dog bone and leave that one alone especially since its lower and not higher in value.</p>
<p>John<br/> <br/> <cite>Norman S Braithwaite said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/scott-allwave-23-restoration-1#3925821Comment74768"><div><div class="xg_user_generated"><p>The resistors used in that set are quite reliable. I would not replace them unless well out of spec. The plate resistors to the IF coils were designed to fail open if the plate circuit were to be shorted thus protecting the plate winding. Replacement with a modern resistor may result in failure of the IF transformer in the event of a short.</p>
<p>I have never encountered a bad mica capacitor in a Scott receiver and only one bad one in another receiver in my many years of restoring radios.</p>
<p>Norman </p>
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</blockquote> The resistors used in that se…tag:ehscott.ning.com,2019-10-31:3925821:Comment:747682019-10-31T14:10:13.797ZNorman S Braithwaitehttps://ehscott.ning.com/profile/NormanSBraithwaite
<p>The resistors used in that set are quite reliable. I would not replace them unless well out of spec. The plate resistors to the IF coils were designed to fail open if the plate circuit were to be shorted thus protecting the plate winding. Replacement with a modern resistor may result in failure of the IF transformer in the event of a short.</p>
<p>I have never encountered a bad mica capacitor in a Scott receiver and only one bad one in another receiver in my many years of restoring…</p>
<p>The resistors used in that set are quite reliable. I would not replace them unless well out of spec. The plate resistors to the IF coils were designed to fail open if the plate circuit were to be shorted thus protecting the plate winding. Replacement with a modern resistor may result in failure of the IF transformer in the event of a short.</p>
<p>I have never encountered a bad mica capacitor in a Scott receiver and only one bad one in another receiver in my many years of restoring radios.</p>
<p>Norman </p>