Check the listing for details. 600:50K Permalloy Audio Boosting The Transformer Lsolation Transformer. Condition: New. Listed at 22.82 USD. Power Adapter Transformer for 6N3 Tube Buffer Audio Preamplifier Pre-AMP Board Material:Permalloy sheet DC resistance: 98 + 98: 1.7K + 1.7K Frequency response: 20hz-20Khz ​Size:20*25*18MM(Length*width*height) Audio signal transformer, the primary secondary side are used in two groups and around the law, (1 + 1: 1 +1) can be used in two groups in series can also be used in parallel between the two groups. Flexible application. This audio transformer uses 80% or more imported EE25mm permalloy sheet, high purity oxygen-free copper wire. So that the audio signal is very good isolation conversion, response frequency is very wide, the spectrum curve straight. Suitable for high-quality audio transmission, enthusiasts DIY, pre-input and output impedance matching, professional audio field, balanced non-equilibrium conversion. Package:1 x 600:50K Permalloy audio transformer Boosting the transformer Isolation transformer On Oct-25-19 at 01:05:20 PDT, seller added the following information: