I used to run 304TLs, still want to put something together with a pair of them, I always did run a small cheap shaded pole fan on them even thou Eimac did not say anything about doing that, never ran 250 or 100ts, they should be a lot easier at hi freq than the 304s. I still really like triodes. I did find that one of my formally good 304s, they sat unused for near 50 years, died that way a year ago when I powered the fil to see how many were left. Think I still have 8 good ones. Bernie ----- Original Message ----- From: "rbethman" <[email protected]> To: "Discussion of AM Radio in the Amateur Service" <[email protected]> Sent: Tuesday, August 25, 2009 1:06 PM Subject: Re: [AMRadio] 100TH and 250TH advice and or comment
> Bernie, > > That's my take on this too! At least from past experience. > > I'm just puzzled by the occurrence. I doubt that there is 25 hours of > actual plate power applied, I.E., key down. I don't make the "old > buzzard" routine talks. I've always been in a round table, most being > technical in nature regarding AM ops., equipment, and such. > > I wonder if maybe these old tubes are at the point where a muffin fan or > two ought to be added to the Old Gals. > > Bob - N0DGN > > Bernie Doran wrote: >> The milky white appears when the tube has lost its vacuum and fil power >> is >> applied, I have seen this vapor of death more than a few times when >> testing >> old fellows. This is not to say that this is the only reason for the >> white >> deposits, but it is the only way I have seen it form. Bernie W8RPW >> > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
