| These three microphones have near-identical external appearance, but the internal workings changed over time. | ||
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This early example has two larger magnets instead of the three found on later models. | |
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The pole pieces have 4BA studs to mount the ribbon carrier. | |
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A central stud had foam glued to the top to support the assembly. | |
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The ribbon carrier is a simple stamping of SRBP. | |
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Some of the ribbon clamp parts. | |
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The 10202 50 ohm output transformer. | |
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I have extended the ground connection to the upper body. | |
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The RV mics usually had the spare pin of the connector grounded. | |
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Double mesh basket. | |
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A part of the original ribbon. | |
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Carrier ready for insertion of new ribbon. | |
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Th enew ribbon is lighter than the original, so I have added a texture to it in addition to the stepped corrugations. | |
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Ribbon carrier replaced. | |
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Mesh cover. | |
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This second example is slightly later. | |
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The ribbon carrier is still an SRBP stampling. | |
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There are a lot more foam blocks in this one and it has the usual three magnets. | |
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Contains a lot of brown dust. | |
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And an unusual transformer with no markings. | |
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Not sure if this is a Reslo ribbon. | |
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This third example is back to the familiar 10202 transformer. | |
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And has the black moulded ribbon carrier. | |
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The ribbon seems original but the mesh is the wrong way round. | |
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A couple of frequency-response plots sent to me by David Pinnegar. This is from the front. | |
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And this is from the back. I assume the differences must come from the asymmetric stucture. |