Al,
I too feel it's a matter of neutralization. But is it a matter of
driver or final neutralization? The driver is a pair of 6146's and the
final is a pair of 4-400A's. Since the finals are passive grid drive,
Johnson didn't include any neutralization circuit them. The plate
current difference is only about 5 mA @ 2100V.
I can check the driver neutralization without too much trouble.
David
KW4DH
On 11/18/2014 3:30 PM, Al Parker wrote:
Hi David,
If I understand the situation, it tells me that the neutralization
of your final(s) is a bit off on that particular band.
Unless it's a big difference (how big??) then most mfgrs say to
tune for max output power, to reduce the power dissipation in the
tube. Sounds like your "slightly" isn't a big dif.
73,
Al, W8UT
www.boatanchors.org
www.hammarlund.info
"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole
On 11/18/2014 1:23 PM, David C. Hallam wrote:
What is this telling me?
By tuning for maximum indicated CW power out I can get a slightly higher
reading on my plate amp meter when I tune for maximum indication on my
scope compared to the watt meter in my Collins station console.
David
KW4DH
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