[Amps] Verify "Q"

[Gary Schafer]

Joe, 

What I sometimes do to set up a tank circuit once you have the values from a
chart or calculation of the plate tune capacitor, load capacitor, and tank
coil inductance is to measure the plate tune capacitor with a capacitance
meter. 
This has to be done with everything disconnected from the capacitor as the
tank inductance will interfere with the capacitance reading on the meter.
Set the capacitor to whatever the calculated value is minus the capacitance
of the tubes. This will get you pretty close.
Then measure the inductance of the coil and set it to what the calculated
value should be. Now hook things back up and you should be very close to the
optimum values needed for what your chart says it needs to be.

73
Gary  K4FMX 

> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Joe
> Sent: Thursday, October 14, 2021 3:30 PM
> To: amps at contesting.com
> Subject: [Amps] Verify "Q"
> 
> Ok,
> 
> Lots of reading, LOTS of help from others here. This should 
> be the last bit of questions I have the need of help with.
> 
> When doing the like reverse plate load simulation test.  I 
> have been told, and have read, both things when doing the 
> test, some have said to lift the plate connections off the 
> tubes.  While others say that they need to still be 
> connected. So what way is it?
> 
> What value of "Q" should one desire to have?
> 
> And once the amp is thought of to be set up with that desired 
> value of "Q"
> 
> Is there a way to measure this value of "Q"?
> 
> Joe WB9SBD
> 
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