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[AMPS] Problem with Henry 2KD

To: <amps@contesting.com>
Subject: [AMPS] Problem with Henry 2KD
From: t-wolford@ti.com (Wolford, Troy)
Date: 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.&nbsp; 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.&nbsp; 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%.&nbsp; 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&nbsp;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>&nbsp;</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>&nbsp;</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>
<BLOCKQUOTE dir=ltr 
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>&nbsp;</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.&nbsp; I let it warm up 
    for a few minutes and applied</FONT> <BR><FONT size=2>about 10W 
drive.&nbsp; 
    Had the tune and load controls set to the nominal numbers from</FONT> 
    <BR><FONT size=2>previous use, BUT REVERSED.&nbsp; I.E.&nbsp; 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.&nbsp; 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.&nbsp; 
    I only had it up to about 100W out, or so.&nbsp; 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.&nbsp; Also 1 tube lights up a lot 
more 
    than the other (very noticable).&nbsp; I opened it up to </FONT><BR><FONT 
    size=2>have a look under the hood, and found no charcoal or shattered 
    components.&nbsp; Not even the </FONT><BR><FONT size=2>smell of burnt 
    electrical components.&nbsp; 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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