i'm giving some thougtht to adding one of these...
http://www.jogis-roehrenbude.de/Roehren ... 2/6AL7.htmto my just-completed lightning. I have to have a look at the front of my chassis but I should have room to put one in the front of the amp chassis, mounted on a 90-degree angle inside the chassis (the display is on the top of the tube).
it has b+ handling up to 350volts or so, and 6.3volt 150ma heaters current..
i think all i'll need to do is hang a voltage divider off one of the power tubes or the signal before the phase splitter, and just tweak it to have the right voltage range (-5.8 to 0 volts, or so), and it could add some really funky pizazz to the amp

the tubes are dirt cheap too; $3 to 6 for new old stock tubes...
what do you guys think? is it doable? should i try? will i fuckup the signal by hanging a divider off it?