Ok,
I don't know much about this high power stuff. highest power tube tranny i
have is 36 Watts on the AM BCB for carrier current use.
and actually that is the only tube tx i have. it's going to be a learning
experience to get it going again.
----- Original Message -----
From: "Brett Gazdzinski" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Thursday, November 29, 2007 9:37 AM
Subject: Re: [AMRadio] fs/ft: Eimac 4CX250B - Unknown Condition
I avoid 4cx250 pull outs as they are almost always bad.
They may test fine, but they arc over after a while in use.
I have about 30 of them that do that.
As they are used, the stuff they made to coat the cathode
(so it emits electrons) gets deposited all over inside the tube,
and at some point they start arcing over.
It just seems to come down to run time (filiments on).
They tend to work for a while, then arc, and the more
you use them the more they arc, till next time when you
start over again, each time getting shorter before they arc.
Maybe reducing the voltage to say 1000 volts
(down from 2000) might give them more time.
I consider these tubes worthless unless they were not used
or have low hours on them.
Not sure what new ones go for, I got 4 new ones a few years ago
for $160.00, used ones used to be $5.00 and not usualy worth that.
Brett
N2DTS
----- Original Message -----
From: "Rev. Robert P. Chrysafis" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, November 29, 2007 9:25 AM
Subject: [AMRadio] fs/ft: Eimac 4CX250B - Unknown Condition
I got this from a radio station in a lot of stuff and it has been
floating
around my house for quite some time. I have no use for it as i'm into
QRP.
I
have no idea if it works or not. It looks like it's in good condition.
I'll swap it for an interesting technical trinket or best cash offer plus
shipping.
My interests are Part 15 AM Microcasting and Computers.
Thank You,
Rev. Robert P. Chrysafis
Universal Life Ministries
http://www.ulc.org
Moderator Hunterdonfree
http://groups.yahoo.com/group/hunterdonfree
Moderator NeighborhoodInformer NJ/PA
http://groups.yahoo.com/group/NeighborhoodInformerNewJersey
http://groups.yahoo.com/group/NeighborhoodInformerpennsylvania
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