-40%

Active Bias Supply for quatro Tubes AB-Q (Single pcb to Control 4 Power Tubes)

$ 40.65

Availability: 22 in stock
  • Compatible Brand: Universal
  • Type: AB-Q
  • Brand: TES
  • Condition: New
  • All returns accepted: ReturnsNotAccepted
  • Amplifier Class: A, AB, B
  • Country/Region of Manufacture: Czech Republic

    Description

    Output Tube Bias Control System.
    Auto Bias servo for four PushPull Tubes.
    ABS Module Features:
    Instructions and description -
    service manual - Read more
    Automatic dynamic bias control module for triode and pentode output stages or push-pull (PP) amplifiers
    Designed for
    class A, AB, or B
    amplifiers.
    The module dynamically controls automatic bias settings to maintain a strict symmetry of currents through both tube branches in the output stage, and to completely avoid flow of DC current through the output transformer, all with minimum requirements on anode current in the tubes. The DC saturates the output transformer which results in increased distortion of low-frequency sounds.
    Bias control is realized by maintaining a constant bias on output tube grids, independently on the level of the driving signal.
    The module may be supplied by the voltage for tube heating (6.3V or 12V AC) in the amplifier.  However, this heating must not have a center tapped winding. An independent 6-12V AC power supply may also be used.
    Automatic dynamic bias control module for four tubes
    Benefits:
    No need to constantly re-adjust tube operating points
    Significantly extended tube life
    Current regulation not influenced by music signal
    Undistorted sound for a great listening experience
    Significant increase in signal clarity – extreme reduction of hum and noise level of the amplifier
    Improved bass transmission
    No maintenance or additional setup needed
    Optimum utilization of tube life
    Suitable for all types of output transformers (especially toroidal ones which require automatic control)
    Safe operation due to minimized danger of runaway tube current – even when the amplifier is left unattended
    Universal use: suitable for all connection types
    Fully analogous control: the module has
    no digital elements
    The modules are suitable for all amplifier types (classes A, AB, or B), as well as single-acting amplifiers with A-class tubes connected in parallel.
    Their use is strongly recommended in existing amplifiers with fixed bias of output tube control grids, as aging of the tubes causes the need for a constant re-adjustment of their operating points.
    The connection secures an absolute symmetry of anode currents through both branches of primary winding of the output transformer. This way, saturation of the the output transformer core with DC current with subsequent signal distortion and dearease in available power is reliably avoided.
    Furthermore, tube operating points need no additional re-adjustments. The module constantly creates optimum conditions for the output stage, independently of tube aging and consequent changes in their parameters.
    Do you want to pre-set the modules? If so, what will it be value of cathode current?
    Need help getting involved?
    If so, send a amplifier circuit diagram.
    We will draw the circuit diagram of the module connection into the circuit diagram.