Dropping resistor for 'U' tubes filament

To use the calculator you need to enter the voltage and to choose tubes being heated. The calculator will compute the value of dropping resistor needed in the ciruit.

Tube #1:

Tube #2:

Tube #3:

Tube #4:

Tube #5:

Tube #6:

Tube #7:

Tube #8:

Tube #9:

Tube #10:

U =

resistors in parallel

capacitors in series

inductances in parallel

LC resonance circuit

bandspread capacitors circuit

single-layer air-cored coil

circular loop coil

square loop coil

frequency,wavelength,period

three-digit capacitor markings

resistor codes (4 bands)

resistor codes (5 bands)

choke/inductor color codes

555 astable

555 monostable

match standard Ex value

combine standard E6, E12 & E24 values

LM317 voltage regulator

dBm ⇆ mW converter

mm ⇆ in converter

resistance of a wire

Ohm's law

dropping resistor for 'P' tubes

dropping capacitor for 'P' tubes

dropping resistor for 'U' tubes

dropping capacitor for 'U' tubes

line-of-sight

dropping resistor for LEDs

Y-Δ transform

Y-Δ transform (capacitances)

parabolic antenna gain

AWG converter

All suggestions and comments are always welcome.

[1.12 2017-01-28][]