Tubes Asylum

Lower filament voltage question....

164.85.85.106

Aldovan

Friends

I want run a 6A3 tube, but my power transformer have only 5V for heaters.
Is possible run the 6A3 with 5V on heaters without damage the tube ?

Thanks,

Aldovan

Follow Ups:

RE: Lower filament voltage question so is it bad or not ??? - Mechans 11:43:49 06/01/15 (0)
what's the the verdict here? It seems like the more power you have the better off your system is.

Steve
RE: Lower filament voltage question.... - Tre' 21:19:39 05/27/15 (4)
"Is possible run the 6A3 with 5V on heaters without damage the tube ?"

I would say no but Steve Bench has done some work with starved filaments showing greatly reduced harmonic distortion.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
- http://stiftsbogtrykkeriet.dk/~mcs/hkjsdh/sbench102/dht.html (Open in New Window)
- RE: Lower filament voltage question.... - FenderLover 07:25:40 05/28/15 (3)
  Wouldn't running 5VAC onto a 6.3VAC nominally rated heater line cause more current draw? Prolly need to compensate with a beefier transformer.
  
  What advantages are there, in this lower voltage arrangement?
  - Less actually - twystd 13:16:26 05/28/15 (2)
    Ohms law, a 6.3 volt filament that draws 1 amp 6.3/1 = 6.3 ohm filament, running the filament at 5V is 5/6.3 = .794 amps.
    twystd
    
    Edits: 05/28/15
    - No, I believe it's the heat in watts that is important. - FenderLover 14:47:31 05/28/15 (1)
      For instance, take a 40 watt light bulb.
      
      At 120VAC, you'd need 0.33 amps of current. Where:
      
      Watt (work or heat) = (voltage) times (current). Or
      
      Current = watts/voltage. 40/120.
      
      If you only had 80 volts, you'd need:
      
      40/80 = 0.5 amps to have the bulb produce 40 watts of light.
      - RE: No, I believe it's the heat in watts that is important. - twystd 15:38:37 05/28/15 (0)
        
        In Reply to: RE: No, I believe it's the heat in watts that is important. posted by FenderLover on May 28, 2015 at 14:47:31
        
        Don't want to argue with you, but both the filament of a light bulb, and a tube, are resistive elements. A bulb rated 40 watts at 120V, won't run 40 watts at 80 volts. At a lesser voltage, the bulb will be dimmer, so using less watts.
        
        twystd

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