База знаний по hi-fi и high-end технике и комплектующим, отзывы и впечатления
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1tubes:d3a [2020/02/25 15:54] staudio [Даташит] |
1tubes:d3a [2020/03/16 12:24] staudio [Схемы] |
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- | ==== Даташит ==== | + | ==== Характеристики |
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==== Схемы ==== | ==== Схемы ==== | ||
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==== Полезные ссылки ==== | ==== Полезные ссылки ==== | ||
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==== Отзывы ==== | ==== Отзывы ==== | ||
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< | < | ||
- | The D3a is a quite modern tube developed for wide band amplifiers for telecommunication applications. It has a nine pin miniature base. The pinout can be seen on the left. Triode connected it has a very high transconductance almost approaching that of the EC8020. Amplification factor is 77 at a plate resistance of 1900 Ohms. See the Telefunken datasheet for all electrical parameters also for the pentode connection. The low plate resistance makes this tube very suitable for transformer coupling. With a step down transformer, | + | The D3a is a quite modern tube developed for wide band amplifiers for telecommunication applications. It has a nine pin miniature base. The pinout can be seen on the left. Triode connected it has a very high transconductance almost approaching that of the EC8020. Amplification factor is 77 at a plate resistance of 1900 Ohms. See the Telefunken datasheet for all electrical parameters also for the pentode connection. The low plate resistance makes this tube very suitable for transformer coupling. With a step down transformer, |
- | Although signal levels are very small in a phonostage we want the amplification device to be as linear as possible. These are the plate curves for the triode connection from the datasheet: | + | Although signal levels are very small in a phonostage we want the amplification device to be as linear as possible. These are the plate curves for the triode connection from the datasheet:\\ |
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- | This looks promising! Let's see how this keeps up with reality. Here are the plate curves taken from an actual tube with a curve tracer. The scale is 5mA and 50V per step, 0.5V grid voltage spacing: | + | This looks promising! Let's see how this keeps up with reality. Here are the plate curves taken from an actual tube with a curve tracer. The scale is 5mA and 50V per step, 0.5V grid voltage spacing:\\ |
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- | Looks perfect for audio applications. | + | Looks perfect for audio applications.\\ |
- | The D3a was made by various european manufacturers: | + | The D3a was made by various european manufacturers: |
This tube has been manufactured by Siemens in the former western part of Germany. It has the characteristic pinched glass around the electrode structure. | This tube has been manufactured by Siemens in the former western part of Germany. It has the characteristic pinched glass around the electrode structure. | ||
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C3o - лампа очень редкая и дорогая, | C3o - лампа очень редкая и дорогая, | ||
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+ | В моём гибриде 6Ж43п переиграли её 6Э6П EL861 и D3a. Последняя сейчас и стоит. 6Э5П не дотянула до этой троицы по звуку.\\ | ||
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+ | У 6Ж43п много микродинамики, | ||
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+ | 6Э5П и 6Э6П усиление не хватит.\\ | ||
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+ | Если будете пробовать D3a, обязательно третью сетку на землю.\\ Звук меняется в лучшую сторону.\\ | ||
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+ | The 7721 is a spectacular output tube in this application. Probably the mostly available are Siemens-made 3DA in Rohre boxes and they are one of the best sounding 7721 as well. The old Siemens 7721 (in none Rohre boxes and with small Siemens printing) was actually made by Telefunken and you will find that in many instances the Telefunken tubes will be sitting inside the Siemens boxes and wise versa. The constriction is very much identical and they sound indistinguishable. Although the old Siemens/ | ||
+ | Cat | ||
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+ | В триоде выигрывает у 7788, в пентоде проигрывает. | ||
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+ | Статья полезная и дает много поводов для размышлений.\\ | ||
+ | Я пробовал следующие лампы в качестве драйвера в двухкаскадном варианте с прямонакалом на выходе (845,300в и тд) | ||
+ | – 6688, | ||
+ | Использовал близкие к приведенным режимы, | ||
+ | характеристик для получения нужного размаха и линейности.\\ | ||
+ | Измерения и отслушивание показало, | ||
+ | Приведенные режимы не лучшие и вообще – нужно все-таки смотреть снятые ВАХи и слушать, | ||
+ | Тогда будут «сюрпризы» и приятные в том числе.\\ | ||
+ | Ожидания не оправдались и лампы расположились в следующем порядке – D3A, | ||
+ | Режимы менялись для каждой лампы отдельно и не совпали с приведенными в статье.\\ | ||
+ | Что касается ГК-71, то при анодном до 800в она показала себя лучше ГМ-70 по микродинамике и басу с одним и тем же выходным тр-ром(8к).\\ | ||
+ | Tandy. |