For many years I used a amp with 4 811a tubes and the way I worked it was to 
ttune for max output with lower drive and then after getting max output I 
increased the drive until no more increase in output and then just backing 
off the drive slightly and never burned out a tube.  That H B amp has been 
taken over by the spiders in my garage years ago.

-----Original Message----- 
From: richard fiorello
Sent: Monday, March 17, 2014 6:21 PM
To: [log in to unmask]
Subject: Re: Plate dipping with a TW-1

Hi;
The problem with the t w 1 is that it only reads forward and
reflected power.  It doesn't give you meter information such as
plate current or grid drive.  Other than Tom's 811 h issue, I
have tuned several amps basically for maximum output and there
were no complaints about the signal and no issues with the
amplifier.  Just couldn't go back to a tube amplifier and manual
tuner.  It was fun back when but changing bands could be more
work than it was worth.  richard
sent from my braille note@