It's been my experience when this happens, it is a tantalum capacitor that blew up. Is there was there one nearby?
Lee, w0vt ----- Original Message ----- From: Richard Palmer To: Ron Cc: Drakelist Sent: Friday, August 20, 2010 8:37 PM Subject: Re: [Drakelist] Fire... really I forgot to mention that there was a 2" flame... hence fire. The tune and load caps were clean as are the coils in the tank. I thought that maybe something wrapped in paper light up. The flame was by where the relay is. I would have bet good money that some sign of the fire would be obvious. But no signs on either side of the chassis, no sign on either of the case covers. No bare leads where something use to be and no blistered pieces. But that smell was very acid. Even the memory of it makes my head pang. It's sitting for now and I'm using a TS-570G. (I prefer my Drake though) On Fri, Aug 20, 2010 at 9:10 PM, Ron <[email protected]> wrote: Rick, Sorry to her you had issues with one of our "loved ones" :-) Acidic smell sounds like an electrolytic cap. Don't recall if any exist in the PA area, but if they do they would not be in "the cage". There might be something below the cage under the chassis. If there was a fire and now it is gone without an obvious trace, have a look at your tune and load caps. Arc over in tank circuit caps tend to occur and then vanish, but they leave scorch and pits marks on the caps. Unfortunately those marks are there to assist another arc over in the future. But I would not think that a tank circuit cap would be acidic smelling. 73, Ron WD8SBB --- On Fri, 8/20/10, Richard Palmer <[email protected]> wrote: From: Richard Palmer <[email protected]> Subject: [Drakelist] Fire... really To: "Drakelist" <[email protected]> Date: Friday, August 20, 2010, 8:04 PM My TR-4 did not want to tune... it caught on fire that looked like it was at the PA section probably around the relay. All I could really do was grab switches and plugs faster than anything I've done in the last twenty years. The smoke was not the conventional electric smell. It was very acid and burning. I sorta took in a nose full doing the above and felt high, in a bad way. I just got around to looking at it and can not find any burnt or distorted part. There is absolutely no sign of soot or heat anywhere. Seeing this I tried to tune her up again. I was getting a very solid 4.5 for the plate current. Now it's only 3. Is it possible (likely) that I "smoked" one of my PA tubes? Thanks in advance, Richard Palmer KB8NXO -----Inline Attachment Follows----- _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist ------------------------------------------------------------------------------ _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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