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Looking for either a Exorcist or explanation ....
Have just completed a HB 4-1000A amp using a 4PR-1000A tube that is a =
radar pulse pullout. This tube is NOT, I repeat, NOT gassy. It has been =
tested and compared to several with full emission. On all bands, 160-10 =
meters the amplifier has what one would expect for output power running =
only 4 KV on the tube.
ONLY on 15 meters when the amp is keyed CW at 1200 watts output there is =
a blue ring around the envelope of the tube about 1/2 inch high. After =
being keyed for about 10 seconds I saw a quick drop in output power of =
about 200 watts and at that point I let off the key. I have never seen =
this with any of the many 4-1000A amps I have built over the years. Have =
you ? I am going to try to capture this "blue glowing ring" on my =
digital camera...if I succeed I will make it available via email.
As soon as I get my hands on another good tube I will try that...next =
week.
Thanks to all that put your minds to this,
Terry W6RU
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<DIV><FONT size=3D2>Looking for either a Exorcist or explanation =
....</FONT></DIV>
<DIV><FONT size=3D2>Have just completed a HB 4-1000A amp using a =
4PR-1000A tube=20
that is a radar pulse pullout. This tube is NOT, I repeat, NOT =
gassy. It=20
has been tested and compared to several with full emission. On all =
bands, 160-10=20
meters the amplifier has what one would expect for output power running =
only 4=20
KV on the tube.</FONT></DIV>
<DIV><FONT size=3D2>ONLY on 15 meters when the amp is keyed CW at 1200 =
watts=20
output there is a blue ring around the envelope of the tube about 1/2 =
inch high.=20
After being keyed for about 10 seconds I saw a quick drop in output =
power of=20
about 200 watts and at that point I let off the key. I have never seen =
this with=20
any of the many 4-1000A amps I have built over the years. Have you ? I =
am going=20
to try to capture this "blue glowing ring" on my digital camera...if I =
succeed I=20
will make it available via email.</FONT></DIV>
<DIV><FONT size=3D2>As soon as I get my hands on another good tube I =
will try=20
that...next week.</FONT></DIV>
<DIV><FONT size=3D2>Thanks to all that put your minds to =
this,</FONT></DIV>
<DIV><FONT size=3D2>Terry W6RU</FONT></DIV></BODY></HTML>
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