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[AMPS] Kenwood TL-922A Grid Current

To: <amps@contesting.com>
Subject: [AMPS] Kenwood TL-922A Grid Current
From: w8cq@indy.net (Jeff Weinberg W8CQ)
Date: Tue, 2 Mar 1999 19:56:47 -0500
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Hello Amp Guru's,

I have a question for the multitude.  I have a perfectly functioning =
TL-922A.  Recently, I have noticed a strange anomaly.  Under keying =
condition, that is keyed up with no modulation, I am seeing about 270 mA =
of plate current (normal), but am showing approximately 10 mA of grid =
current.  I cannot figure out why I am showing the small amount of grid =
current.

I have changed tubes between three different amps and three different =
sets of 3-500Z's and it happens with all tubes.  I am sure the problem =
is in the amp.  In addition, I have checked the shunt resistors in the =
grid circuit, and they all check good.

Also, the meter is perfectly functioning in the HV or RF position.  The =
grid current aside, all is functioning properly.

Anyone have any ideas what may be bad or where to continue looking (Rich =
or Carl)?

Thanks,

Jeff Weinberg  W8CQ
w8cq@indy.net


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>

<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT color=3D#000000 size=3D2>Hello Amp Guru's,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>I have a question for the =
multitude.&nbsp; I=20
have a perfectly functioning TL-922A.&nbsp; Recently, I have noticed a =
strange=20
anomaly.&nbsp; Under keying condition, that is keyed up with no =
modulation, I am=20
seeing about 270 mA of plate current (normal), but am showing =
approximately 10=20
mA of grid current.&nbsp; I cannot figure out why I am showing the small =
amount=20
of grid current.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>I have changed tubes between three =
different=20
amps and three different sets of 3-500Z's and it happens with all =
tubes.&nbsp; I=20
am sure the problem is in the amp.&nbsp; In addition, I have checked the =
shunt=20
resistors in the grid circuit, and they all check good.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>Also, the meter is perfectly =
functioning in the=20
HV or RF position.&nbsp; The grid current aside, all is functioning=20
properly.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>Anyone have any ideas what may be =
bad or where=20
to continue looking (Rich or Carl)?</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>Thanks,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>Jeff Weinberg&nbsp; =
W8CQ</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2><A=20
href=3D"mailto:w8cq@indy.net";>w8cq@indy.net</A></FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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