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=== Power Supply === | === Power Supply === | ||
The power supply is typical of Tektronix scopes of early 1960s. | The power supply is typical of Tektronix scopes of early 1960s. | ||
It is linear. | |||
All power rectifiers are silicon diodes. | |||
An [[OG3]] tube is used as a voltage reference for the +300 V supply. | An [[OG3]] tube is used as a voltage reference for the +300 V supply. | ||
The other supply voltages use the +300 V supply as their reference. | The other supply voltages use the +300 V supply as their reference. | ||
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{{MissingSpecs}} | {{MissingSpecs}} | ||
== Mechanical == | |||
The 661 is constructed similarly to late-model [[500-series scopes]]. | |||
The chassis is made of sheet aluminum. | |||
Most wiring is on [[Ceramic_Strips|ceramic strips]]. | |||
The side panels come off like those of a [[545|545B]] or [[547]]. | |||
The plug-ins of a 661 are incompatible with any other Tek scope, | |||
but the construction style is similar. | |||
The 661, like the 500-series scopes, uses Amphenol 26-series connectors | |||
for the electrical interface between plug-in and mainframe. | |||
The sides and rear of the 661 painted identically to late-model | |||
500-series scopes, i.e., Tek-blue wrinkle. | |||
==Links== | ==Links== | ||