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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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<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> </DIV>
<DIV><FONT color=3D#000000 size=3D2>I have a question for the =
multitude. I=20
have a perfectly functioning TL-922A. Recently, I have noticed a =
strange=20
anomaly. 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. 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> </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. I=20
am sure the problem is in the amp. 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> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Also, the meter is perfectly =
functioning in the=20
HV or RF position. The grid current aside, all is functioning=20
properly.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </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> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Thanks,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Jeff Weinberg =
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> </DIV></BODY></HTML>
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