Excellent, Jim...
Thanks so much!
John
WB5CW
-Original Message-
From: amradio-boun...@mailman.qth.net
[mailto:amradio-boun...@mailman.qth.net] On Behalf Of Jim Wilhite
Sent: Friday, February 20, 2009 9:28 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] 75A2
Reading this makes me think of my own experiences, I have an 837 tube for my
ART-13, the tube is brand new, I fitted it into the transmitter when the
filament failed on the previous one, it did not work, I tested it on the
tube tester, 100% within all perameters, checked it back in the rig, no
In experience I have had with tubes checking good but not working in
a radio had a lot to do with the design of the circuit they are in.
If the circuit doesn't take into account things like plate to grid
capacitance and such properly, they can be a problem for high gain
tubes. There is a lot o
ah yes, the drugstore tester, designed to sell tubes to rubes :-)
George wa8sco
>I can remember in my days as a black and white TV repairman, going on a
>service call and having to replace a tube or 2. The customer would scream
>that he had just tested all the tubes at the Thrifty Drug store
--Original Message-
From: amradio-boun...@mailman.qth.net
[mailto:amradio-boun...@mailman.qth.net] On Behalf Of RICHARD GEORGE
Sent: Friday, February 20, 2009 8:17 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] 75A2
I can remember in my days as a black and white TV
"
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, February 20, 2009 7:56 AM
Subject: Re: [AMRadio] 75A2
>
>
>
> John, Todd is quite right. The only thing for sure with a new tube is
> that it is new. I've had several radios that worked quite we
Amateur Service
Subject: Re: [AMRadio] 75A2
John, Todd is quite right. The only thing for sure with a new tube is that
it is new. I've had several radios that worked quite well with tubes that
tested poor to bad. Some receivers will perform well with a fair tube and
others won't with the
ssion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] 75A2
It's certainly not a bad idea to have replacements if you do end up needing
them (you will, someday), just not advisable to swap them wholesale as
others have said. The radio itself is still the best tube tester IMO, onc
John, Todd is quite right. The only thing for sure with a new tube is that it
is new. I've had several radios that worked quite well with tubes that tested
poor to bad. Some receivers will perform well with a fair tube and others won't
with the same tube, If it works, leave it alone. Good
It's certainly not a bad idea to have replacements if you do end up
needing them (you will, someday), just not advisable to swap them
wholesale as others have said. The radio itself is still the best tube
tester IMO, once you get it running it's easier to compare results
through performance. Tube t
09 6:23 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] 75A2
John, Do you have a tube tester? I'd try testing them before replacing them
all.Bob AB8OP
__
Our Main Website: http://www.amf
h.net
Subject: Re: [AMRadio] 75A2
"I'm going
to be tempted to bite on the Ebay ads that just replace all tubes"
Kind of overkill before any additional problem solving is done. Might be
interesting to at least see if there's AC on the secondary of the power
tranny. Then ski
John, Do you have a tube tester? I'd try testing them before replacing them
all.Bob AB8OP
__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.ne
"I'm going
to be tempted to bite on the Ebay ads that just replace all tubes"
Kind of overkill before any additional problem solving is done. Might be
interesting to at least see if there's AC on the secondary of the power
tranny. Then skip to see if there's DC on the output of the filter ca
I was given this little bent piece of aluminum with a few tubes on it and some
components. With it, I was told "add a mechanical filter to that thing and that
makes an SSB product detector for the 75A2."
Has anyone heard of this? Can anyone point me to an article that this might
have been built
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