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300B DRD Tube Amplifier


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Schematics
300B DRD  (current page indicator)
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45 Silver Stereo Amp
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300BDRD Audio Tube Amp

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$214.50M19
Power300BDRDPSS$268.50M6
HV Choke2929$37.50Standard
Fill Choke1.5A$26.50Standard
OutputSE3K100CU$214.50Copper Single Secondary
OutputSE3K100PSSS$539.00PS 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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