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1A5: Difference between revisions
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V<sub>C</sub> is controlled by a ten-turn potentiometer and can vary from −5 V to +5 V (0.5 V on the 5 V/div to 20 V/div ranges). | V<sub>C</sub> is controlled by a ten-turn potentiometer and can vary from −5 V to +5 V (0.5 V on the 5 V/div to 20 V/div ranges). | ||
==Internals== | |||
The 1A5 is solid-state except for a pair of [[7586|7586 nuvistors]] used in the upper half of a cascode in the second amplifier stage. | |||
The attenuator switching is mechanically complex. A gear mechanism drives the input attenuator switch (under the internal cover) selecting attenuators ×1000 (20 V/div to 5 V/div), ×100 (2 V/div to 500 mV/div), ×10 (200 mv/div to 50 mV/Div) or no attenuators (20 mV/Div to 1 mV/div). | |||
Additionally, in the 500 mV/div and 50 mV/div positions, the operator can pull the V/Div knob outward when switching to one of the next two more sensitive ranges, in which case the higher attenuator (and higher input and comparison voltage range) remains in place. | |||
==Pictures== | ==Pictures== | ||