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300B DRD Amplifier


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300B DRD  (current page indicator)
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300BDRD

Our 300B DRD amp is derived from the classic Loften-White design. Using a 300B (or Sovtek 6A3) tube the output will be over 10 watts, -1dB 18 Hz to over 20 kHz, less than 1% distortion and only needing 0.7 V input to give full output. No coupling devices (capacitors or transformers) are used to minimize the coloring the sound. Power supply has been changed to give a efficient tighter more stable power delivery.

Improvements include:

  • Replacement of hard to find oil cap with large value electrolytic which increases coupling at low frequencies
  • Simpler means to adjust the operating points of both tubes
  • A means to measure current of output tube
  • Increased input sensitivity by 100%
  • Rectifier tubes eliminated, diodes giving increased tighter bass because of no forward voltage drop
  • Heat protection devices have been added where needed to safeguard Schottky diodes

    Parts we can supply:

    TransformerPart NumberCost EachDescription
    Power300BDRDPSS$195M19
    Power300BDRDPSS$244M6
    HV Choke2929$34Standard
    Fill Choke1.5A$24Standard
    OutputSE3K100CU$195Copper Single Secondary
    OutputSE3K100PSSS$490PS Single Secondary

    All designs are the sole property of Electra-Print Audio Corporation with all rights reserved worldwide. Licensing is available for commercial use.


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