Back when I was going to work on mine, I was thinking of prying the rubber away from the aluminum oven with something like a feeler gauge, but also using some naptha (lighter fluid) to help release any adhesive... I didn't get around to doing it, but that was the way I was going to progress.
-Chuck Harris Ed Palmer wrote: > > > On 2016-09-26 10:00 AM, Christopher Hoover <[email protected]> wrote: >>> > >>> >You might be able to slide something like a feeler guage down between the >>> >oven and the rubber blanket to break the oscillator free. The oven on mine >>> >is a plain metal cylinder. This way, the rubber sheet should protect the >>> >Dewar from your feeler guage. On mine, the mounting bolts for the 2N3792 >>> >transistor both have ground lugs. I think I see them on yours. You could >>> >hook something through the ground lugs and use that to pull the oscillator >>> >out of the rubber sheet and then remove the sheet later. >>> > >> Thanks Ed, >> >> I think the rubber sheet on mine is against metal. I haven't yet seen the >> glass dewar. >> >> The adhesion is huge. >> >> Do you know if the holes opposite the 2N3792 are threaded? If they are, I >> might try running the screws out and using those holes with longer screws >> as my pull points. I can't pull on the lugs hard enough -- I've tried. >> >> -christopher. >> 73 de AI6KG > > Yes, you have seen the Dewar. The silvery ring that's outside the rubber is > the top > of the Dewar. What you have to do is unstick and unfold the rubber starting > from the > open area in the center. Work your way outward. The rubber is only 2 or 3 mm > thick. Once you completely clear the rubber out of the way, you'll see the > edge of > the oven. The TO-3 transistor is mounted on top of the oven assembly. Once > you can > see the edge, you have to slide something like a long feeler gauge down along > the > edge of the oven to break it free from the rubber. Work your way all around > the > oven. It's about 85 mm long. It'll still be stuck on the bottom, but you > might be > able to pull it free. > > When I took mine apart, I ended up tearing off all the rubber at the top and > then > cutting out that ring of hard foam to get at the Dewar so I could smash it > more. I'm > guessing you'd rather not do that! :) But sacrificing the rubber on the top > might be > okay, if you have to. > > Sorry, but I don't know if the mounting holes for the transistor are threaded > or > not. In any case, since the oven and Dewar are bonded to the rubber, you're > pulling > on the Dewar when you pull on the oven. Not a good plan until you break the > oven > free from the rubber. Those Dewars are built in a rather fragile manner. > Your > typical home Thermos is much more robust. > > Ed > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
