Electra-Print Logo - Audio Tube Amplifier Components 
Bookmark and Share

Electra Print Audio

300B DRD Tube Amplifier

Home About Amps for Sale Schematics Tech Blog eBay Sales Contact/Ordering
300B DRD  (current page indicator)
45 DRD
PVA Bass
PVA Bass Atten
Ultrapath Line Amp
45 Silver Stereo Amp
Low IMD Amp

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
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.

Site MapLinksPhotos
Copyright 2007-2022 Electra-Print Audio   All Rights Reserved