- #1
bwinter
- 27
- 1
I found a thyratron tube at a yard sale recently and I want to build a circuit to heat the filament and illuminate the mercury vapor for purposes of building a novelty lamp.
The filament is just 2.5VDC at 7 amps and I have a transformer for that.
To light the vapor I will apply DC rectified and smoothed from the AC mains.
The illumination is related to current, and to achieve maximum illumination of the electrode I want to achieve something on the order of milliamps, above the current for Townsend discharge but below that of arc discharge. I don't know what those values will be so let's say, between .01 and .5 amps.
So V = IR
120 = 0.01R
12000 Ohm = R1
120 = .5R
2400 Ohm = R2
So my load resistor in series with the thyratron will be a 10K rheostat in series with a 2.4k Ohm resistor.
Hoping for any input from someone with tube experience, if this might work.
The filament is just 2.5VDC at 7 amps and I have a transformer for that.
To light the vapor I will apply DC rectified and smoothed from the AC mains.
The illumination is related to current, and to achieve maximum illumination of the electrode I want to achieve something on the order of milliamps, above the current for Townsend discharge but below that of arc discharge. I don't know what those values will be so let's say, between .01 and .5 amps.
So V = IR
120 = 0.01R
12000 Ohm = R1
120 = .5R
2400 Ohm = R2
So my load resistor in series with the thyratron will be a 10K rheostat in series with a 2.4k Ohm resistor.
Hoping for any input from someone with tube experience, if this might work.