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of a 530-, 540-, or 550-series scope. The second stage of the Type 81 is a cathode-follower, | of a 530-, 540-, or 550-series scope. The second stage of the Type 81 is a cathode-follower, | ||
which drives the 580-series scope using a low impedance, as is required by 580-series scopes. | which drives the 580-series scope using a low impedance, as is required by 580-series scopes. | ||
Type 81 is tubebase and has bandwidth of 33 megacycle. | |||
Type 81A is solid state and has bandwidth of 50 megacycle. | |||
81 and 81A are not same. | |||
* [http://w140.com/tek-81.pdf Tektronix Type 81 Manual (PDF)] | * [http://w140.com/tek-81.pdf Tektronix Type 81 Manual (PDF)] |
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