Signature: Sophia Electric 300B Single Ended Output Transformers

 300B Single Ended Output Transformers: Sophia Electric vs. Audio Note Sophia Electric in-house made #91-01 and #91-03 and #91-05 output transformers were designed by Dr. DWU and Richard Wugang and made by Sophia Electric in-house.Price for 300B single ended signature series output transformers:Option 1: $999.99 for one matched pair of Sophia Electric Signature 91-01 300B single ended output transformers potted in aluminum case, 3K or 3.5K Primary, 0-4-8 ohm secondary.Option 3: $1499.99 for one matched pair of Sophia Electric Signature 91-03 300B single ended output transformers potted in aluminum case, 3K or 3.5K Primary, 0-4-8 ohm secondary.Option 5: $1999.99 for one matched pair of Sophia Electric Signature 91-05 300B single ended output transformers potted in aluminum case, 3K or 3.5K Primary, 0-4-8 ohm secondary. 91-01 OPTs are being used in Sophia Electric 91-01 single ended mono-block 300B amplifiers. Please see review below:Positive Feedback Review: "...The Sophia Electric Mode