TAC

This tool computes valves amplifer electronic stuff. It also exposes formulas as a package.

Usage

$ tac tac.yml --verbose

Heaters:
- 6L6GC:   2 * 900mA = 1.8A
- ECC81:   1 * 300mA = 300mA
- 6SL7:    3 * 300mA = 900.0mA
Choke: 5.39H
Power consumed:
- Wa: 60W      - for 2 valve(s) in PP
- Ia: 130.2mA  - at plate for 2 valve(s) in PP
- Is: 10.7mA   - at screen for 2 valve(s) in PP
Preamp consumed:
- ECC81:   typical: 2 * 10mA = 20mA
           maximum: 2 * 8.3mA = 16.7mA (5W)
- 6SL7:    typical: 6 * 2.3mA = 13.8mA
           maximum: 6 * 3.3mA = 20mA (6W)

====

Selected transformer voltage: 350-0-350
Diode Reverse Repetative Maximum (Vrrm) rating: 1.2kV
  -> We knock off 10% to allow for variation in mains voltage, and knock off another 10% to allow for the transformer voltage being high if loaded only lightly.
  -> The popular 1N4007 is rated for 1000V. Two 1N4007 in series can handle 2000v.
  -> http://www.valvewizard.co.uk/bridge.html
Calculated voltage at first capacitor (B+): 479.5V
Calculated DC current at first capacitor: 201mA
Calculated DC wattage at first capacitor: 96.4W
Calculated choke: 5.93H @ 52.09mA (10% plus factored in)
  -> Resonant frequency is kept below 10Hz.
Calculated current: 195.25mA (10% plus factored in) at 6.6kΩ load
  -> Maximum preamp current consumption is used.
Calculated maximal valve(s) wattage: 71W
Calculated filament current (typically the 6.3v secondary): 3A
Calculated cathode bypass capacitor: Ck=35.01µF for Rk=1kΩ @ F=5Hz
Calculated cathode bypass capacitor: Ck=15.92µF for Rk=2.2kΩ @ F=5Hz
Calculated cathode bypass capacitor: Ck=6.25µF for Rk=5.6kΩ @ F=5Hz
Calculated LED resistor: 201.89Ω for 0.089W @ VAC=5.33V

Disclaimer:
  Please, consult your chosen tube model manufacturer data sheet, especially, when you entered the Rload.
  Then the calculation provided is an estimation based on the assumption that Rload is not relatively small!
  Tubes are non-linear devices and current draw may change under a number of conditions!
  This calculation is provided in the hope of being useful as a reference only.
  Proceed with caution! This tool disclaims any responsibility from any intended or actual use and consequences of this calculation.

Thanks:
  This tool is fully inspired by https://thesubjectmatter.com/calcptcurrent.html
  It use formula from Merlin Blencowe's books and its website http://www.valvewizard.co.uk

Specifications

• Only computes for FULL WAVE rectification
  • Center tap transformer
  • Non center tap transformer
• The rectifier must have a capacitor input load
  • https://www.hammfg.com/electronics/transformers/rectifier
• Preamp tube current consumption may be way greater than the real value because it's based on the maximum power dissipation.

License

MIT

Contributing

All PRs are welcome.

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request