[AMPS] Problem with Henry 2KD
Wolford, Troy
t-wolford@ti.com
Fri, 31 Aug 2001 10:24:57 -0500
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Last night, I changed tube positions, and the problem stayed with the socket
position. I.E. the suspected
bad tube worked just fine in the other socket, and the "good tube" is now
not lighting up.
Correct me if I am wrong, but this should isolate the problem down to just a
handfull of components
that are unique to just this tube socket. Hopefully I can identify the bad
component(s) this weekend
and get her runnin back at 100%. Only problem , is that it will not be easy
to get to some of the parts.
It is a desktop unit, so things are quite packed in.
Thanks for all of the suggestions!
7 3
Troy
KC5KDM
-----Original Message-----
From: Phil Clements [mailto:philk5pc@tyler.net]
Sent: Wednesday, August 29, 2001 3:21 PM
To: Wolford, Troy; amps@contesting.com
Subject: Re: [AMPS] Problem with Henry 2KD
Swap the tubes to the opposite sockets, and see
if the brighter one moves, or the darker one is now the
brighter one.
You have probably also zapped a padder capacitor in
the tuning or loading section of the tank.
Please report what you find.
GL!
Phil, K5PC
Phil Clements
410 VZ CR 4903
Ben Wheeler, TX 75754
----- Original Message -----
From: Wolford, Troy <mailto:t-wolford@ti.com>
To: 'amps@contesting.com' <mailto:'amps@contesting.com'>
Sent: Wednesday, August 29, 2001 12:53 PM
Subject: [AMPS] Problem with Henry 2KD
Let me begin by saying that I did a very bad thing to my henry!
Here is how it went.
I was preparing to tune up on 80M. I let it warm up for a few minutes and
applied
about 10W drive. Had the tune and load controls set to the nominal numbers
from
previous use, BUT REVERSED. I.E. Not enough inductor and way too much load
C.
To top this off, I had the bandswitch in the 40M position. So I had a
SEVERE
output matching error.
Anyway, as I was adjusting the tuning, I heard a klunk (sic?) and the RF
output dropped
quite a bit. I only had it up to about 100W out, or so. Definitely was not
a high voltage
bang, but more mechanical in nature. Now I have to use the load control at
almost full
meshed position and about 20 - 30 counts more on the roller inductor to get
max power on
80M. Also 1 tube lights up a lot more than the other (very noticable). I
opened it up to
have a look under the hood, and found no charcoal or shattered components.
Not even the
smell of burnt electrical components. The AMP still makes about 1200W on
80M, but the
large change in tuning values concerns me, as well as the tubes not being
"balanced".
I suspect that I have killed one tube and damaged the other.
1986 vintage 2KD Classic, Pair 3-500Z (Eimac)
Any help would be appreciated.
7 3
Troy
KC5KDM
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<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=164382315-31082001>Last
night, I changed tube positions, and </SPAN></FONT><FONT color=#0000ff
face=Arial size=2><SPAN class=164382315-31082001>the problem stayed with the
socket position. I.E. the suspected</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=164382315-31082001>bad
tube worked just fine in the other socket, and the "good tube" is now not
lighting up.<BR><BR>Correct me if I am wrong, but this should isolate the
problem down to just a handfull of components</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=164382315-31082001>that
are unique to just this tube socket. Hopefully I can identify the bad
component(s) this weekend</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=164382315-31082001>and
get her runnin back at 100%. Only problem , is that it will not be easy to
get to some of the parts.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=164382315-31082001>It
is a desktop unit, so things are quite packed in.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=164382315-31082001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=164382315-31082001>Thanks
for all of the suggestions!</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=164382315-31082001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=164382315-31082001>7
3</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=164382315-31082001>Troy</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=164382315-31082001>KC5KDM</SPAN></FONT></DIV>
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style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">
<DIV class=OutlookMessageHeader><FONT face="Times New Roman"
size=2>-----Original Message-----<BR><B>From:</B> Phil Clements
[mailto:philk5pc@tyler.net]<BR><B>Sent:</B> Wednesday, August 29, 2001 3:21
PM<BR><B>To:</B> Wolford, Troy; amps@contesting.com<BR><B>Subject:</B> Re:
[AMPS] Problem with Henry 2KD<BR><BR></DIV></FONT>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">Swap the tubes to the
opposite sockets, and see</FONT></DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">if the brighter one moves,
or the darker one is now the</FONT></DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">brighter one.</FONT></DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">You have probably also
zapped a padder capacitor in</FONT></DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">the tuning or loading
section of the tank.</FONT></DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial"></FONT> </DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">Please report what you
find.</FONT></DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">GL!</FONT></DIV>
<DIV><FONT color=#0000ff face="Slashed Zero Arial">Phil, K5PC<BR></FONT></DIV>
<DIV>Phil Clements<BR>410 VZ CR 4903<BR>Ben Wheeler, TX 75754<BR></DIV>
<BLOCKQUOTE dir=ltr
style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A href="mailto:t-wolford@ti.com" title=t-wolford@ti.com>Wolford, Troy</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
href="mailto:'amps@contesting.com'"
title=amps@contesting.com>'amps@contesting.com'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, August 29, 2001 12:53
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [AMPS] Problem with Henry
2KD</DIV>
<DIV><BR></DIV>
<P><FONT size=2>Let me begin by saying that I did a very bad thing to my
henry!</FONT> </P>
<P><FONT size=2>Here is how it went.</FONT> </P>
<P><FONT size=2>I was preparing to tune up on 80M. I let it warm up
for a few minutes and applied</FONT> <BR><FONT size=2>about 10W drive.
Had the tune and load controls set to the nominal numbers from</FONT>
<BR><FONT size=2>previous use, BUT REVERSED. I.E. Not enough
inductor and way too much load C.</FONT> <BR><FONT size=2>To top this off, I
had the bandswitch in the 40M position. So I had a SEVERE</FONT>
<BR><FONT size=2>output matching error.</FONT> </P>
<P><FONT size=2>Anyway, as I was adjusting the tuning, I heard a klunk
(sic?) and the RF output dropped</FONT> <BR><FONT size=2>quite a bit.
I only had it up to about 100W out, or so. Definitely was not a high
voltage </FONT><BR><FONT size=2>bang, but more mechanical in nature. Now I
have to use the load control at almost full </FONT><BR><FONT size=2>meshed
position and about 20 - 30 counts more on the roller inductor to get max
power on </FONT><BR><FONT size=2>80M. Also 1 tube lights up a lot more
than the other (very noticable). I opened it up to </FONT><BR><FONT
size=2>have a look under the hood, and found no charcoal or shattered
components. Not even the </FONT><BR><FONT size=2>smell of burnt
electrical components. The AMP still makes about 1200W on 80M, but the
</FONT><BR><FONT size=2>large change in tuning values concerns me, as well
as the tubes not being "balanced".</FONT> <BR><FONT size=2>I suspect that I
have killed one tube and damaged the other.</FONT> </P>
<P><FONT size=2>1986 vintage 2KD Classic, Pair 3-500Z (Eimac)</FONT> </P>
<P><FONT size=2>Any help would be appreciated.</FONT> </P>
<P><FONT size=2>7 3</FONT> <BR><FONT size=2>Troy</FONT> <BR><FONT
size=2>KC5KDM</FONT> </P></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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