| 1. | All the ingredients for the pentagrid were now in place.
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| 2. | The pentagrid proved to be a much better mixer.
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| 3. | An example would be the 6A7 pentagrid converter.
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| 4. | The pentagrid converter tube would oscillate and also provide signal amplification as well as frequency shifting.
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| 5. | The pentagrid also featured in a UK patent ( GB426802 ) granted on 10 April 1935.
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| 6. | Thus a pentagrid radio could easily be converted to a triode-hexode without any other circuit modifications.
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| 7. | This was rapidly followed by the introduction of tubes specifically designed for superheterodyne operation, most notably the pentagrid converter.
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| 8. | Some manufacturers that had adopted the autodyne mixer converted some, if not all, of their designs to pentagrid mixers.
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| 9. | One of their popular pentagrid converter designs was the "'MX40 "', initially marketed in 1934.
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| 10. | The development of the pentagrid or "'heptode "'( seven-electrode ) valve was a novel development in the mixer story.
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