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I recently picked up a very mint AL80A with a nearly dead tube. After =
some research I discovered that the Amertiron manual contradicts what =
Eimac published in their data sheet for the 3-500Z. Or am I in error?
Page 4 of the AL80A manual step 12 reads"Apply enough drive to indicate =
either 1000 watts of output power or 200 mA of grid current. Re-peak the =
LOAD and PLATE controls. The grid current must not be over 200mA, the =
plate current over 550mA or the output over 1200 watts."
My Eimac 3-500Z spec sheet states that for class AB2 cathode driven max =
dc plate voltage is 4kvdc, max Ip is 0.4 amps, plate dissipation is 500 =
watts, and grid dissipation is 20 watts.
How does the operator achieve "1000 watts of output power" out of an amp =
running a single 3-500Z at an Ep of 3100 vdc?? Isn't 200mA on the grid =
kinda high for a single bottle?? What about 550mA of Ip??
I am trying to prevent these same problems from re-occuring. The =
previous owner is an old time ham who bought a new AL-82. The problems =
with the AL80A don't seem to be the amp but they seem to be the =
INSTRUCTIONS.=20
Comments and opinions most welcome. I am not an "old salt" when it comes =
to these amps but something doesn't jive.
Thank you for your time.
Lane
KM3G
San Diego
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<DIV><FONT color=3D#000000 size=3D2>I recently picked up a very mint =
AL80A with a=20
nearly dead tube. After some research I discovered that the Amertiron =
manual=20
contradicts what Eimac published in their data sheet for the 3-500Z. Or =
am I in=20
error?</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Page 4 of the AL80A manual step 12=20
reads"Apply enough drive to indicate either 1000 watts of output =
power or=20
200 mA of grid current. Re-peak the LOAD and PLATE controls. The grid =
current=20
must not be over 200mA, the plate current over 550mA or the output over =
1200=20
watts."</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>My Eimac 3-500Z spec sheet states =
that for class=20
AB2 cathode driven max dc plate voltage is 4kvdc, max Ip is 0.4 amps, =
plate=20
dissipation is 500 watts, and grid dissipation is 20 watts.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>How does the operator achieve =
"1000 watts=20
of output power" out of an amp running a single 3-500Z at an Ep of =
3100=20
vdc?? Isn't 200mA on the grid kinda high for a single bottle?? What =
about 550mA=20
of Ip??</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I am trying to prevent these same problems from =
re-occuring.=20
The previous owner is an old time ham who bought a new AL-82. The =
problems with=20
the AL80A don't seem to be the amp but they seem to be the INSTRUCTIONS. =
</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Comments and opinions most welcome. I am not an =
"old=20
salt" when it comes to these amps but something doesn't =
jive.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Thank you for your time.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Lane</FONT></DIV>
<DIV><FONT size=3D2>KM3G</FONT></DIV>
<DIV><FONT size=3D2>San Diego</FONT></DIV></BODY></HTML>
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