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Potentiometers: Difference between revisions
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In 1962, Tek-made potentiometers started being used in many instruments. | In 1962, Tek-made potentiometers started being used in many instruments. | ||
These are typically identifiable by their gray delrin cover (and their Tek part number). | These are typically identifiable by their gray delrin cover (and their Tek part number). | ||
[[File:311-259 1.jpg|thumb|400px|right|311-259 pot in [[O|Type O]]]] | [[File:311-259 1.jpg|thumb|400px|right|pristine 311-259 pot in [[O|Type O]]]] | ||
They are "stopless" pots, which means that they have a detent but can be rotated through the detent. | They are "stopless" pots, which means that they have a detent but can be rotated through the detent. | ||
This feature was intended to reduce shaft and pot problems that result from excessive torque on traditional pots. | This feature was intended to reduce shaft and pot problems that result from excessive torque on traditional pots. | ||
[[File:311- | [[File:311-116 cracked 1.jpg|thumb|400px|right|close-up of cracked plastic part, partial fix using tightened wire]] | ||
These types tend to develop cracks in the cross-shaped plastic part that holds the setscrew clamping the shaft. | These types tend to develop cracks in the cross-shaped plastic part that holds the setscrew clamping the shaft. | ||
Tightening that screw then causes the crack to widen, and the shaft is not clamped strongly enough anymore, causing it to slip. | Tightening that screw then causes the crack to widen, and the shaft is not clamped strongly enough anymore, causing it to slip. | ||
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|- | |- | ||
| [[311-259]] (311-0259-00) || 710 Ω || VAR GAIN in [[O|Type O]] (R6530) | | [[311-259]] (311-0259-00) || 710 Ω || VAR GAIN in [[O|Type O]] (R6530) | ||
|- | |||
| [[311-116]] (311-0116-00) || 770 Ω || VAR GAIN in [[CA|Type CA]] (R3338, R4338) | |||
|- | |- | ||
| [[311-279]] (311-0279-00) || 770 Ω || VAR GAIN in [[CA|Type CA]] (R3338, R4338) | | [[311-279]] (311-0279-00) || 770 Ω || VAR GAIN in [[CA|Type CA]] (R3338, R4338) | ||
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'''311-279''' | '''311-279''' | ||
<gallery> | <gallery> | ||
311- | 311-116.jpg | 311-116 in [[CA|Type CA]] | ||
311- | 311-116 cracked 1.jpg | close-up of cracked plastic part, partial fix using tightened wire | ||
311- | 311-116 cracked 2.jpg | ||
311-116 cracked 3.jpg | |||
</gallery> | </gallery> | ||