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The Tektronix Type A is a single-channel preamp introduced in 1959 for 500-series scopes. | The Tektronix Type A is a single-channel preamp [[introduced in 1959]] for [[500-series scopes]]. | ||
A 545 with a Type A has a system risetime of 18 nanoseconds. The plug-in uses a 12AU6 | A [[545]] with a Type A has a system risetime of 18 nanoseconds. The plug-in uses a [[12AU6]] | ||
in the front end as a cathode follower. This input stage drives the second stage, a | in the front end as a cathode follower. This input stage drives the second stage, a | ||
differential amplifier made of two 12AU6 tubes. The second stage drives the output stage, | differential amplifier made of two 12AU6 tubes. The second stage drives the output stage, | ||
a pair of cathode followers made of both halves of at 12AT7 tube. The plate of each output tube | a pair of cathode followers made of both halves of at [[12AT7]] tube. The plate of each output tube | ||
is connected to the cathode of the other output tube by a 0.005 microfarad capacitor. This | is connected to the cathode of the other output tube by a 0.005 microfarad capacitor. This | ||
is intended to improve high-frequency balance. | is intended to improve high-frequency balance. |
Revision as of 05:55, 5 July 2010
The Tektronix Type A is a single-channel preamp introduced in 1959 for 500-series scopes. A 545 with a Type A has a system risetime of 18 nanoseconds. The plug-in uses a 12AU6 in the front end as a cathode follower. This input stage drives the second stage, a differential amplifier made of two 12AU6 tubes. The second stage drives the output stage, a pair of cathode followers made of both halves of at 12AT7 tube. The plate of each output tube is connected to the cathode of the other output tube by a 0.005 microfarad capacitor. This is intended to improve high-frequency balance.