From: Eric Webner 
Subject: Re: [drakelist] R4C xtal bank bad

and it just isn't that critical. If you're driving a 5 KW
amplifier then you need to worry about it.>
> Do you recommend that I vary the other resistor in order
to achieve > accuracy on the meter, or can I play around
with values on the shunt > resistor (the 3.3 ohm
resistor)?> See
above.> One other observation: my low power
output!
 could be
 attributed to this > meter shunt resistor being off, as
that would cause me to back off on > the loading quite a
bit. This is also why I didn't want to load it to > full
power (500 ma???) for fear of melting a couple sweep tubes. It
> also makes me wonder about my bias. Is there a voltage
one should > shoot for, or is getting the bias (idling)
current still the > preferable approach? Do I need to
realign everything if I need to > reset the
bias?> This is exactly the case. When
you thought you were loading to 340 mA, you were probably only
drawing 150 mA, resulting in low output. THE MOST IMPORTANT
CURRENT READING IS THE BIAS SETTING. This is why you
"calibrate" the metering circuit at 100 mA. These
meters only cost about $1.25 and are NOT highly accurate, linear
meters. So we make a "reference" point for the
_important_ meter reading and use it as an "indicator"
only for the far less imp!
ortant
 absolute plate current reading at full
power.73, Garey -
K4OAHAtlanta
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