[Boatanchors] Power Out

David C. Hallam dhallam at knology.net
Tue Nov 18 15:55:30 EST 2014


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.


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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