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#1
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Dumb output transformer question
My beloved tube mic preamp's output transformer bit the dust.
Fortunately, a while back, out of curiosity, I did some measurements on the transformer. It had a turns ratio of around 6 : 1 with a spec'ed output impedance of 600 ohms. Here's the deal, I have a transformer which is identical except that it has a turns ratio of 12 : 1 with a split primary config. Can I use only half of the primary(and leave the other half unconnected) to attain a 6:1 ratio? Second question: What would happen if I put the primary halves in parallel? The output transformer is capacitor coupled so there is no DC in the primary. Thanks Ed |
#2
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"Ed" My beloved tube mic preamp's output transformer bit the dust. Fortunately, a while back, out of curiosity, I did some measurements on the transformer. It had a turns ratio of around 6 : 1 with a spec'ed output impedance of 600 ohms. Here's the deal, I have a transformer which is identical except that it has a turns ratio of 12 : 1 with a split primary config. Can I use only half of the primary(and leave the other half unconnected) to attain a 6:1 ratio? ** Yes. Second question: What would happen if I put the primary halves in parallel? ** Ok if you get the halves "in phase" - if there are not four wires on the primary forget it. .......... Phil |
#3
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"Ed" wrote in message ... My beloved tube mic preamp's output transformer bit the dust. Fortunately, a while back, out of curiosity, I did some measurements on the transformer. It had a turns ratio of around 6 : 1 with a spec'ed output impedance of 600 ohms. Here's the deal, I have a transformer which is identical except that it has a turns ratio of 12 : 1 with a split primary config. Can I use only half of the primary(and leave the other half unconnected) to attain a 6:1 ratio? ** Yes. Second question: What would happen if I put the primary halves in parallel? ** OK as long as you get the halves in phase - that means four wires must be available for the primary. It doesn't change the ratio though. ........... Phil |
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