[AMRadio] 100TH and 250TH advice and or comment

Bernie Doran qedconsultants at embarqmail.com
Tue Aug 25 14:42:55 EDT 2009

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" <rbethman at comcast.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
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
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