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I'm ready to start drilling holes on a new amp, and I wanted
to confirm from you YC-156 users out there that I am in the
ball park on my design numbers. Please comment on them:
!. Pi-L designed @ 1000 ohms plate load.
2. Tuned input designed @ 24 ohms cathode impedance, with
a "Q" of 4.....Eimac says 3 or more.
3. c. -30 volts bias should give ZSAC of 600 ma with Ep of 6000v.
4. Siemens arc suppressor installed from grid to cathode to limit
internal tube arcs to < 4 Joules.
5. HV glitch resistor installed; will start testing with a 10 ohm 100 =
watt
resistor.
6. 6 minute timer installed to turn on HV and PTT after filament is =
powered.
(Per Eimac)=20
7. Filament power controlled through air flow sensor in blower.
8. 10 minute timer installed to run blower after shut-down. (Per Eimac)
Am I missing anything here? I like to live by the motto: measure twice,
drill once. An Elmer of mine once said: "Measure with a micrometer, mark
it with chalk, and cut it with an axe!"
Thanks for all ideas, caveats, and suggestions!
(((73)))
Phil, K5PC
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<DIV>I'm ready to start drilling holes on a new amp, and I wanted</DIV>
<DIV>to confirm from you YC-156 users out there that I am in the</DIV>
<DIV>ball park on my design numbers. Please comment on them:</DIV>
<DIV> </DIV>
<DIV>!. Pi-L designed @ 1000 ohms plate load.</DIV>
<DIV>2. Tuned input designed @ 24 ohms cathode impedance, with</DIV>
<DIV> a "Q" of 4.....Eimac says 3 or more.</DIV>
<DIV>3. c. -30 volts bias should give ZSAC of 600 ma with Ep of =
6000v.</DIV>
<DIV>4. Siemens arc suppressor installed from grid to cathode to =
limit</DIV>
<DIV> internal tube arcs to < 4 Joules.</DIV>
<DIV>5. HV glitch resistor installed; will start testing with a 10 ohm =
100=20
watt</DIV>
<DIV> resistor.</DIV>
<DIV>6. 6 minute timer installed to turn on HV and PTT after filament is =
powered.</DIV>
<DIV> (Per Eimac) </DIV>
<DIV>7. Filament power controlled through air flow sensor in =
blower.</DIV>
<DIV>8. 10 minute timer installed to run blower after shut-down. (Per=20
Eimac)</DIV>
<DIV> </DIV>
<DIV>Am I missing anything here? I like to live by the motto: =
measure=20
twice,</DIV>
<DIV>drill once. An Elmer of mine once said: "Measure with a micrometer, =
mark</DIV>
<DIV>it with chalk, and cut it with an axe!"</DIV>
<DIV> </DIV>
<DIV>Thanks for all ideas, caveats, and suggestions!</DIV>
<DIV> </DIV>
<DIV>(((73)))</DIV>
<DIV>Phil, K5PC<BR></DIV></BODY></HTML>
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