[AMPS] Henry 3K
Sun, 31 Jan 1999 15:02:02 -0800
>I am having a prob. with my 3K. I cannot get it to load past 600ma.
>in the pa volt position the voltage is 2500 in cw/tune. in ssb the reading
>is 3500v. The resting current is cw is 90ma and in ssb it is only 120ma.
>I originally thought the tubes were soft and installed new ones but nothing
>has changed from the old tubes.
>According to the manual the resting current in cw should be between 100 and
>120ma and in ssb between 170 and 220ma so it would appear at first glance
>that the problem is attached to there.
Measure the potential between the grid and the filament CT (cathode).
This is your bias V. It is probably a bit too high. Getting ur bias
from a string of diodes on a perfboard would allow setting the ZSAC to
the needed 170mA or so.
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R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
FAQ on WWW: http://www.contesting.com/ampfaq.html
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