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Hi Jeff, and Reflectees,
Actually, you can treat the YC-156 as a 3CX15000B7 as far as RF
linear amp service is concerned. The difference is that the anode
cooler is much smaller, with only 5000 watts dissipation instead of=20
15000 watts. The recommended operation of the heater is one on/off
cycle per day. A 6 minute warm-up time is required before anode
voltage and drive voltage are applied. Cooling air should also be run
for several minutes after voltages are removed. Eimac suggests that =
the
tuned input circuit operate at a Q of three or more. The reason for =
all the
above is that the heater is very small compared to most tubes of this
power rating. (15 volts @ 15 amps) One side of the heater is internally
connected to the cathode, so you will need a filament choke. The good
news is that it need be only a 15 amp unit. The best news is that a =
YC-156=20
requires no socket! With 100 watts drive @ 6kv Ep, you can give a
10 kw Bird slug a real workout.
GL, and be careful.
Phil, K5PC
Subject: [AMPS] YC-156 Cathode/Filament question
Hello list,
I have a question about the YC-156. Does this tube have an indirectly =
heated cathode. Someone told me that one side of the filament is tied =
internally to the cathode. Someone else told me to treat this tube as a =
giant 8877. If anyone would know this is the list. Could someone please =
explain about the cathode and filament on this tube.Any help is =
appreciated.
Best Regards Jeff KD4LYH
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>Hi Jeff, and=20
Reflectees,</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>Actually, you can =
treat the=20
YC-156 as a 3CX15000B7 as far as RF</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>linear amp =
service is=20
concerned. The difference is that the anode</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>cooler is much =
smaller, with=20
only 5000 watts dissipation instead of </FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>15000 =
watts. The=20
recommended operation of the heater is one on/off</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>cycle per day. A =
6 minute=20
warm-up time is required before anode</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff> voltage and =
drive=20
</FONT><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>voltage are =
applied.=20
Cooling air should also be run</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff> for several =
</FONT><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>minutes after =
voltages are=20
removed. Eimac suggests that the</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff> tuned =
</FONT><FONT=20
face=3D"Slashed Zero Arial" color=3D#0000ff>input circuit operate at a Q =
of three or=20
more. The reason for all the</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>above is that the =
heater is=20
very small compared to most tubes of this</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>power rating. (15 =
volts @ 15=20
amps) One side of the heater is internally</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>connected to the =
cathode, so=20
you will need a filament choke. The good</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>news is that it =
need be only=20
a 15 amp unit. The best news is that a YC-156 </FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>requires no =
socket! With 100=20
watts drive @ 6kv Ep, you can give a</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>10 kw Bird slug a =
real=20
workout.</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>GL, and be=20
careful.</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" color=3D#0000ff>Phil, =
K5PC</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial" =
color=3D#0000ff></FONT> </DIV>
<DIV><B>Subject:</B> [AMPS] YC-156 Cathode/Filament question</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Hello list,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I have a question about the YC-156. =
Does this=20
tube have an indirectly heated cathode. Someone told me that one side =
of the=20
filament is tied internally to the cathode. Someone else told me to =
treat this=20
tube as a giant 8877. If anyone would know this is the list. Could =
someone=20
please explain about the cathode and filament on this tube.Any help is =
appreciated.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Best Regards Jeff=20
KD4LYH</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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