🔊 5PCS Audio 1300 Transformer Transformador with Enhanced SEO Review

I measured both windings of all 5 transformers with an ohmmeter, 10 measurements in total. Not sure what to call primary or secondary; Let's call them long (1300) and short (8). On 3 out of 5 transformers the short had a resistance of 4.5 ohms. The other two were open. On 4 out of 5 long ones there was a resistance of 82 ohms; on the other hand it was open. This ratio is about 40:1 for the "good" and not 1300:8, i.e. 162.5:1 with a deviation of about 4 times. I'll try measuring the inductance…

I did not buy these but others seem to find many broken windings hence 2 stars. What I would like to add is that transformer impedances are not the same as the DC resistance of the winding. They cannot be measured in the ohm range with the DVM. The transformer impedance is the impedance of the circuit at 1kHz for which this transformer is designed to operate with low losses. The impedance ratio is the square of the turns ratio or voltage ratio. Meanwhile, the copper wire may be different in…

These are absolutely not 1300:8 ohm transformers. I've bought several batches of these from different vendors and they're all about the same size: the transformer turns ratio is closer to 5.1:1 than the 12.75:1 it should be. All Revain 1300:8 transformers, including the red ones, have this problem. The primary winding has a DC resistance of about 86 ohms and 245 mH at 1 kHz. Secondary 9.6 mH with 3 ohm DC resistance. The primary inductance with the secondary winding shorted is about 1.9 mH and…