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RE: Tubes in Pre-amps: your expertise and honest opinion.
Duncan says:-
>ok.
>back to the science.
>running a valve at a low voltage won't make it glow less;
unless there's less voltage across the heater filament
(perhaps a trick to get more "valve sound" at lower anode/cathode voltages,
..but definitely good for making the valve last longer
> the glow comes from the heater & the cathode, to a lesser degree.
>running a valve at a very high voltage will occasionally produce an
>additional blue glow, especially if the cathode's almost stripped.
also caused by incorrect bias adjustment (correctable in some amps)
> the LED installed by EH, behringer & korg (amongst others) is
> there because the real glow wasn't bright enough to satisfy their
> designers, probably because modern tubes have a little more
> suspension material in them, & it hides the "interesting" bits.
I don't see any glow at all from the valve in my Behringer pre.
...but I know it's connected, the first unit I got had the nice clear
sound of a faulty valve.
(otherwise, it's pretty much cosmetic)
...I loved the way they put a "warm up delay" on the LEDS for the "valve
glow"
andy butler