29 Oct
2007
29 Oct
'07
1:59 a.m.
Hi,
tony said:
These sound a lot like what we caleld 'DM160's
in the UK. These are about
the size of a 1.24" (3AG??) cartridge fuse and have 4 active leads coming
out of one end.
2 of them are a filament (direcctly heated cathode), running at about 1V.
Another is the anode/target, which IIRC has a grid-like structure, It is
normally riun at about 30V +ve wrt the filament. The fourth wire is the
control grid, IIRC with the grid at the smae voltage as the filament the
device glows green, a -3V grid bias cuts it off and it's dark. Needless
to say the actual current drawn y the cotnrol grid from the transistor
logic is minimal/
According to my data book:
Filament 1.0V 0.03A
Target Volts 50V
Target Current 0.585mA
Grid Voltage Change 0 to -3
--
Cheers,
Stan Barr stanb at dial.pipex.com
The future was never like this!