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 OPTs: Option 1: $699.99 per matched pair of Sophia Electric 91-01 300B output transformers potted in steel case, 3K or 3.5K Primary, 0-4-8 ohm secondary. Option 3: $899.99 per matched pair of Sophia Electric 91-03 300B output transformers potted in steel case, 3K or 3.5K Primary, 0-4-8 ohm secondary.Option 5: $1499.99 per matched pair of Sophia Electric 91-05 300B output transformers potted in steel case, 3K or 3.5K Primary, 0-4-8 ohm secondary.Primary 3K/3.5K, Secondary 0-8 ohm. 4 ohm is optional (free of charge). Other impedance (16 ohm, 11 ohm and 6 ohm) secondary output tap requires custom-making. Additional cost $150 for 91-01 model, $200 for 91-03 model or $275 91-05 model for each additional secondary tap.91-01 300B OPTs are being used