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 * [[Media:070-237.pdf|Tektronix P6016 manual]] (includes 131 schematics)
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-The '''Tektronix Type 131''' is a Current Probe Amplifier used only with the [[P6016]] Current Probe. Type 131s were never given serial numbers, instead, they were produced cronologically in "Models." Models 1 thru 3 looked alike, while Model 4 got a redesigned enclosure like that used by the Type 134.
+The '''Tektronix Type 131''' is a current probe amplifier used only with the [[P6016]] Current Probe. Type 131s were never given serial numbers, instead, they were produced cronologically in "Models." Models 1 thru 3 looked alike, while Model 4 got a redesigned enclosure like that used by the Type 134.
-All four Type 131 Models used PNP transistors, thus requiring a negative power source. Models 1 thru 3 were hard-wired to their separate minus 19 V power supplies, while Model 4 got a power supply, 015-027, with a proprietary Tektronix coaxial connector.  The center pin of the Type 131 Model 4 power supply connector is grounded, so the outer contact is ~19 V negative. Note that the 015-0058-01 power supply for the Type 134 uses the same connector with the same relative voltage levels (center conductor ~19 V more positive than the outer contact) but the negative outer contact on the Type 134 power supply is held close to ground. So the Type 131 Model 4 will only work with the correct 015-027 Power Supply.
-Using the wrong power supply with either amplifier Type will short circuit the power supply output. Tektronix claims that this will not damage the Type 134 power supply (015-0058-01) if connected to a Type 131. Damage to the Type 131 power supply (015-027) seems likely if it is connected to a Type 134.
-Power supplies for Type 134s are labeled "POWER SUPPLY FOR TYPE 134", while those for Type 131 Model 4s have no marking other than Tektronix and 015-027. In addition, all Type 131 power supplies have the AC line connector built onto the end of the power supply housing, while the 134 power supplies came with a ~3' AC line cord and plug.
 {{BeginSpecs}}
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 {{EndSpecs}}
 (all specifications are overall values including the P6016 probe)
+==Internals==
+All four Type 131 Models used PNP transistors, thus requiring a negative power source. Models 1 thru 3 were hard-wired to their separate minus 19 V power supplies, while Model 4 got a power supply, 015-027, with a proprietary Tektronix coaxial connector.  The center pin of the Type 131 Model 4 power supply connector is grounded, so the outer contact is ~19 V negative. Note that the 015-0058-01 power supply for the Type 134 uses the same connector with the same relative voltage levels (center conductor ~19 V more positive than the outer contact) but the negative outer contact on the Type 134 power supply is held close to ground. So the Type 131 Model 4 will only work with the correct 015-027 Power Supply.
+Using the wrong power supply with either amplifier Type will short circuit the power supply output. Tektronix claims that this will not damage the Type 134 power supply (015-0058-01) if connected to a Type 131. Damage to the Type 131 power supply (015-027) seems likely if it is connected to a Type 134.
+Power supplies for Type 134s are labeled "POWER SUPPLY FOR TYPE 134", while those for Type 131 Model 4s have no marking other than Tektronix and 015-027. In addition, all Type 131 power supplies have the AC line connector built onto the end of the power supply housing, while the 134 power supplies came with a ~3' AC line cord and plug.
 ==Pictures==