tube amp, voltage regulation

Discussion in 'General Electronics Chat' started by bug13, Jun 21, 2014.

  1. bug13

    Thread Starter Senior Member

    Feb 13, 2012
    Hi guys

    I was looking into a tube circuit the other day, they usually operates between 100 - 150 VDC, one thing I am curious about, why they don't use a high voltage regulator in vacuum tube amp?? Instead, they use some simple RC filter to filter the DC voltage.
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
  3. alfacliff

    Well-Known Member

    Dec 13, 2013
    because the voltage supply isnt as critical in tube amps. a solid state amp with a 12 volt supply is a lot more critical for supply voltage because they start with so little and are current operated. the tupe amp starts with much higher voltage, so the actual voltage isnt as critical. some circuits such as oscilators and dc amps require regulation, but not most circuits.
  4. nsaspook

    AAC Fanatic!

    Aug 27, 2009
    For most receiver and power tube circuits the actual plate voltage was not critical and when it was required (in things like radar repeaters) most tube regulator circuits used shunt type regulators so they wasted power. I still have a few triode tube shunt regulator modules for high voltage bias supplies at work.
  5. crutschow


    Mar 14, 2008
    Tubes are relatively expensive so they don't use a tube for regulation unless it's really required by the circuit.