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Post by 238 on Mar 21, 2019 5:43:11 GMT -5
Changed out C67 & C64. I was wondering about the strange looking caps, C33/C63 & 2 more that look like them. Are they a different kind of cap? Also seeing that the SSB light wires where cut not sure if SSB even works. Not sure if they done anything else to the SSB. Talk to the owner & a few others an everyone says it sounds good. Puts out 4w swings to 6w on Siltronix meter on avg. Might just leave well enough along, far now an let him run it awhile. Have got to order the caps. 238
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Post by 238 on Apr 2, 2019 22:54:17 GMT -5
Still trying to find out if the yellow looking caps, i believe the # is c33&c63 + 2 others are different than other caps? 238
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Post by gator7 on Jun 19, 2019 12:21:22 GMT -5
Why mess with the SSB? Just leave the mode switch on AM. My MK III didn’t wort well on SSB, so I didn’t use it on that side.
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Post by 238 on Jun 19, 2019 21:49:34 GMT -5
The mode switch in a MKlll controls more than AM/SSB. I just use the MKlll receiver. I use the small AM transmitters. 238
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air1
Ratchet Jaw
Posts: 69
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Post by air1 on Jun 20, 2019 11:42:48 GMT -5
Those yellow caps you are asking about are most likely Mylars. They are silver sometimes also. Depends who made them. If they are cylindrical and of low values like .1uf or less and 150vdc or more that's what they are. They usually don't go bad but they are cheap so I always replace them. I have never had a bad one in all the radios I've worked on but I have heard of others that have.
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Post by 2600 on Jun 20, 2019 22:41:44 GMT -5
The one time you'll see one of the yellow film capacitors go bad is to drop a blob of molten solder on its side. The thermoplastic materials in the capacitor are meant to tolerate heat from soldering, carried into the body of the part through the lead wires. The outer covering and internal insulating film are NOT tolerant of those temperatures. Same story if your soldering iron just brushes against one of those caps. Same as the hot glob of molten solder falling onto it. Melts the insulating film, makes the capacitor fail as a short.
Unless one of these goes bad from external damage, they almost never fail on their own.
Browning would update the internal construction of that radio from one production run to the next, from one year to the next. Those yellow capacitors cam along in later production years. If the radio is having trouble, the list of likely reasons probably won't include those yellow capacitors.
Lots of other items that DO fail as a regular thing.
73
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