I tuned my Valliant using the power supply sounds and the output from 
the receiver with the AVC off and the RF gain way down.  People 
watching over my shoulder said I was always within spec.  Great rig 
in the old 160 A M days!!
Had a second replacement in my A M second childhood fifteen years 
ago!!  Still a great rig.  My stepson and his wife were entranced 
with the 866s when the rig was out of its cabinet!!
Pat, K9JAUAt 02:09 AM 12/14/2011, you wrote:
>Their isn't much that you really need sight  for.  The VCO across the meter
>is great, but a properly neutralized amp is resonent  at peak power output,
>so a VCO across the watt meter, let alone a TW1 or the new device comming
>out will work.
>I used to tune my valiant by diping the power supply hum, I mean the plate
>and pressing my ear to the case.  Later, a friend of mine gave me a
>stethoscope, which made the listening easier.  I adjust the grid and
>modulation by listening to the pinging of the meter needle.  That's why I
>always liked the valiant, I could tund it up independantly.
>With the VCO across a watt meter, their isn't a radio, amplifier, or tuner
>that can't be adjusted.