--------------E22F946F35EABD2C772DC3D1
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Hi Jon, just pull the plate connector off each tube to find the
defective one. Just remember to pull the mains plug and
short out the HV with a grounding stick. I would like to
see you on 80m again.
gl es 73 Steve VE3TU
jon wrote:
> Hi All. Wonder if anyone can help me with a small problem I have with
> my amp The amp I have uses a pair of 3CX 800 A7 tubes and is approx 18
> months old. The problem is that every so often the main fuse will blow
> because one of the tubes has " flashed over ". This has been happening
> every so often since the amp was new so I have come to the conclusion
> that one of the tubes was faulty from the start and I have now
> resigned myself to the fact that I am going to have to purchase a new
> tube. I am looking for suggestions as to how to find out which tube it
> is without replacing either one in turn or finding out by trial and
> error because sometimes the flashover takes out one or two other small
> components in the amplifier. One other point is that these flashovers
> occur usually when I first switch on the amp and especially so when it
> has been stood for a period of time without bieng switched on. Any
> comments will be greatly appreciated. Regards Jon G0NVD
--------------E22F946F35EABD2C772DC3D1
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<body bgcolor="#FFFFFF">
Hi Jon, just pull the plate connector off each tube to find the
<br>defective one. Just remember to pull the mains plug and
<br>short out the HV with a grounding stick. I would like to
<br>see you on 80m again.
<p>gl es 73 Steve VE3TU
<p>jon wrote:
<blockquote TYPE=CITE><style></style>
<font size=-1>Hi All.</font> <font size=-1>Wonder
if anyone can help me with a small problem I have with my amp</font> <font
size=-1>The
amp I have uses a pair of 3CX 800 A7 tubes and is approx 18 months
old.</font> <font size=-1>The
problem is that every so often the main fuse will blow because one of the
tubes has " flashed over ".</font> <font size=-1>This has been happening
every so often since the amp was new so I have come to the conclusion that
one of the tubes was faulty from the start and I have now resigned myself
to the fact that I am going to have to purchase a new tube.</font> <font
size=-1>I
am looking for suggestions as to how to find out which tube it is without
replacing either one in turn or finding out by trial and error because
sometimes the flashover takes out one or two other small components in
the amplifier.</font> <font size=-1>One other point is that these
flashovers occur usually when I first switch on the amp and especially
so when it has been stood for a period of time without bieng switched
on.</font> <font size=-1>Any
comments will be greatly appreciated.</font> <font size=-1>Regards
Jon G0NVD</font> </blockquote>
</body>
</html>
--------------E22F946F35EABD2C772DC3D1--
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|