Brett, I'm thinking the thermal cycling, a number of years of use that is for the most part intermittent, followed by then sitting for another year and a half has been what broke the back. So long as the intermittent use was a rather regular periodic interval, I was heating them up and getting them full use.
I got medical issues that wouldn't let me enjoy the big AM rig, and it sat. I started trouble shooting a problem, and I find the three of them are now gassy. Yet the second radio only got used for about two hours since I got it, (I can only run one at a time. LOL), and it has now sat for over four years AND it has NO gassy tubes. I trying to understand why ONE did and the OTHER did not. Then it could just be those tubes were going anyway. Although I doubt it. They all can in the original Mil issue packaging. It is all strange! Bob - N0DGN Brett Gazdzinski wrote: > I have a modulator that uses four 100TH tubes, it has had the same tubes for > the last 25 years, they look clear, and work fine. > I have a bunch of spare 100 TH and TL's, all look ok last I looked... > > I have noticed a bunch of white tubes in the 7 and 9 pin tube stashes, maybe > the seals fail, the pins rust, or something happens and the air gets in. > > You have a lot of thermal cycling on tubes that get used, from cold to very > hot, to cold again, but tubes just sitting going bad? > > Brett > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
