Michael,

By design, when the plate current is dipped (lowest meter reading on the 
amps meter) the output power is near its maximum.  The load control must be 
adjusted in order for the amp to match the antenna impedance.  You must 
alternately adjust the plate and load to achieve maximum power.  Of course, 
your drive level will change output power also.

  The TW1 is just looking at RF power not the plate current which is 
displayed on the amps meter.

Howard #3

----- Original Message ----- 
From: "Michael Ryan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, March 17, 2014 6:06 PM
Subject: Plate dipping with a TW-1


> Hi all:=20
>
> Ever since I learned how to operate tubed gear with my TW-1,=20
> I've never heard the pitch decrease to indicate a dip in plate. I've =
> always used the increase or decrease in pitch to indicate an increase or =
> decrease in forward or reflected power etc.=20
> I was also taught to always go for max power with adjusting the plate =
> and load controls of an amp and then reduce the drive.=20
> So should I in fact hear a decrease in pitch if the plate is dipped, if =
> so, never have heard it. LOL=20
> It also makes sense to set the load for an initial setting and then =
> don't readjust it for the final tune up drive level,=20
> as in my case with the 811H, suggested by Tom, W8JI who was in charge of =
> the 811 line for Ameritron before they were bought out by MFJ=20
> The way it was described was the 2 or 3 prior light drive loads don't do =
> anything.=20
> The main thing with tubes is the grid and plate currents and keeping =
> them below there max ratings and everything's fine.=20
> In the case of my 102 and amp, my outputs are below the maxes and I'm =
> delivering specified power outputs.=20
> On another note, Tom wants to work with me in developing a grid =
> announcing or tone generating device and I suggested connecting an =
> oscillator to the amps ALC, from what I understand and it would activate =
> when the 200 of grid current would be reached.=20
> Perhaps he might refine something which could include the plate current =
> as well, if that's even possible.=20
>
> 73:=20
> Mike VO1AX=20 



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