ÿþ<HTML> <HEAD><TITLE>Sophia Electric in Washington, DC, USA </TITLE></HEAD> <body bgcolor="#FFFFFF" text="#000000"> <p align=center><font size = 6><b>Sophia Electric&#153 Model 91-05 300B Dual-Mono Stereo Tube Amplifier</b></font><br><br> <P align=center><font size="5"><a href="../../91-01_vs_03_05_300B_amp.htm">Sophia Electric 91-01 vs. 91-03 vs. 91-05 300B Single Ended Amplifiers</a></P> <p font size="4" align=center><a href="../../reviews/review_300B_amp.htm"><font color="#FF0000"><i>User Reviews</i></font></a></p> <p style='color:blue' font size="5"><a href="http://www.positive-feedback.com/Issue53/sophia300b.htm"><i>Positive Feedback Review:</i></a> "...The Sophia Electric Model 91-01 300B mono amps are audiophile dream amps, they have great sonics top to bottom, bass articulation that is the best I've heard, and the SE 91-01 nails all of the nerdy audiophile things like soundstaging, imaging, sense of space, and transparency in such a beguiling way that even music lovers that don't give a rat's ass about audiophile-type sonics will appreciate its prowess. <p> <p style='color:blue'>I recommend these amps heartily, and I'd give them my normal 'two thumbs up' endorsement, but that just wouldn't capture what these Sophia Electric Model 91-01 300B mono amps are capable of, so I've invented a new rating, the 'two hard nipples up' recommendation, which is the highest award I've given out to date. ..." &#8211;&#8211;&#8211; Jeff Day</P> <p align=center> <font size = 5>Sonic Purity * Super Quietness * Sonic Magic and Musicality <br><br></font></P> <P><CENTER><IMG src="../../images/amp/horn_speakers.jpg" border="0" alt="91-05 300B amplifier"></CENTER></P> <p align=center>Sophia Electric s competitive advantages come from superior propriety output transformers and carefully voiced driver circuit module designed by Dr. DWU and Richard Wugang.</P> <P><CENTER><IMG src="../../images/amp/9103-front.jpg" border="0" alt="91-03 300B amplifier"></CENTER></P> <P><CENTER><IMG src="../../images/amp/9103-back.jpg" border="0" alt="91-03 300B amplifier"></CENTER></P> <H2 align=center>Sophia Electric 91-05 single ended 300B amplifiers deliver:</H2> <p align=center><font size = 4.5>1. Sonic Purity: Voice from heaven, anything less pure is pollutive coloration. </P> <p align=center><font size = 4.5>2. Super quietness and dynamic range: Totally jet black background that made this 8 watts output sound like thunder when team up with good efficient speakers(Please check out SET Princess model I speakers for modest budget and Princess horn speakers at high end budget).</p> <p align=center><font size = 4.5>3. Musicality and Sonic Magic: Without musicality, it would be just cold man-made machine. Sophia Electric amplifiers are proud for superior musicality and sonic magic that would make you listen to your discs again and again. </P> <p align=center><font size = 4.5>4. First class resolution: you can hear almost every voice from a grand choir group, not by brightness, but through the intrinsic native resolution power of the great amplifier. </font></P> <p align=center><font size = 4.5>5. Excellent extension on bass and on high frequency: this Sophia Electric single ended 300B amplifier can deliver superior bass extension without losing mid-range magic and high end extension through Sophia Electric in house made output transformers. </font></P> <H2 align=center>Parts quality:</H2> <p align=center><font size = 4.5>1. High end aluminum alloy Chassis with world class of precision and artistic ascetics. </P> <p align=center><font size = 4.5>2. Sophia Electric in-house made transformers are being used to deliver the best possible single ended circuit sonic magic. </p> <p align=center><font size = 4.5>3. Proprietary driver circuit potted in an in-house made metal case epoxy potted module. </P> <p align=center><font size = 4.5>4. Combinations of variety audiophile brand parts are being used through out. </font></P> <p align=center><font size = 4.5>5. Sophia electric Princess mesh plate 300B tubes are the stock output tubes. Sophia Electric 6SN7tubes are optional upgrade choice for driver tubes. </font></P> <H2 align=center>Price: </H2> <P align=center>Standard 91-05 model: $8000 per unit for USA voltage, or $8500 per unit for non-USA voltage</p> <H2 align=center>Available upgrade option:</h2> <P align=center>Super quiet version: additional $1000<br> <br> <TABLE align=center border="0" cellpadding="4" cellspacing="1" width="100%" bgcolor="#f0f0f0"> <TR> <TD align=center><H2>Sophia Electric 91-05 300B Stereo Tube Amplifier Specification</H2></TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Design: </TD> <TD>8 watts X 2 output, single ended 300B tube amplifier with zero negative feedback.</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>OPT Transformers:</TD> <TD>Sophia Electric designed and in house made 91-05 output transformers, Potted. </TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Power transformers:</TD> <TD>Using the same high end core materials and winding method</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Power transformer rating:</TD> <TD>250 W</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Input Sensitivity:</TD> <TD>450 mv</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Input Impedance:</TD> <TD>100K</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Frequency Range:</TD> <TD>12 Hz  35 KHz +/- 3 dB </TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Residual Noise/Hum: </TD> <TD>Super Quiet version: 0.9 mv <br> Standard version: 2.0 mv</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Distortion: </TD> <TD>-0.18% at 1 watts at 1KHz </TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Weight </TD> <TD>60 pounds</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>AC Power:</TD> <TD>120V60Hz (USA) <br> European/Asia voltage. And Japanese voltage models upon request</TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Required break in time:</TD> <TD>50-100 hours </TD> </TR> </TABLE> <TABLE align=center border="1" cellpadding="0" cellspacing="0" width="600"> <TR> <TD width=150 height=20>Warranty:</TD> <TD>One year parts and labor, Sophia electric brand tubes one year, Non-Sophia Electric tubes 6 month.</TD> </TR> </TABLE> <P align=center> Copyright@2011 Sophia Electric, Inc. All rights reserved. </P> </body> </html>