AncientBrit wrote:Hi Harry,
I'm attaching a clearer pdf version of the circuit.
The tube heater reg is set to +7.6v with a safety dropper 18R to produce around 5.8v across the heaters, so the tube heater is nominal 6.3v.
The reason I chose this arangement was I'd just burnt out a heater on a 1inch vidicon and I wanted to limit the inrush current.
[/quote]I could have configured the voltage reg to be constant current but I felt this was safer limiting inrush br resistor.
(Not sure if the forum will accept a pdf)
Regards,
Graham
AncientBrit wrote:Hi Harry,
Here are some pixs of the camera I took last night.
(I'm no great shakes as a photographer)
Cheers,
Graham
AncientBrit wrote:Harry,
In pix 5 you'll see at the end of the chassis my warning to myself about 1000v !!
Just in case I forget.
The HV multiplier caps are not shrouded so I have to be careful.
Again Harry be careful with the High voltages!!
Kind regards,
Graham
AncientBrit wrote:The reason I chose this arangement was I'd just burnt out a heater on a 1inch vidicon and I wanted to limit the inrush current. Graham
harry dalek wrote:I always wonder why 6.3 volts for valves and why it never really changed over the years ..
AncientBrit wrote:Harry,
Please find attached a re-draw of the circuit.
No circuit changes, just cleaned up the transistor outlines etc.
Cheers,
Graham
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