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| ==Internals== | | ==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]] for 115 V<sub>AC</sub>, 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. | | 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]] for 115 V<sub>AC</sub>, with a proprietary Tektronix coaxial connector. While the Type [[134]] uses the same coaxial power supply connector, the power supplies are not interchangeable. So the Type 131 Model 4 will only work with the correct [[015-027]] power supply. |
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| 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 [[015-027]] power supply seems likely if it is connected to a Type [[134]]. Damage to the amplifier itself is unlikely either way.
| | See the Type 131 [[015-027 | power supply page ]] for more information. |
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| Power supplies for Type [[134]]s are labeled "POWER SUPPLY FOR TYPE [[134]]", while those for Type 131 Model 4 have no marking other than Tektronix and [[015-027]]. All Type 131 power supplies have the AC line connector built onto the end of the power supply housing. Early [[134]] power supplies share the same construction, while later [[134]] power supplies came with a ~1 m AC line cord and plug.
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| ==Accessories==
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| The Type 131 Model 4 could be purchased with a battery adapter instead of a power supply. The 131 / battery adaptor set was sold as a Tektronix 015-026. The adaptor was simply a pair of wires, ending in fork lugs, that came together in a socket that mated with the 131 Model 4 power cord. See [[015-027 | here ]] for more information
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| ==Pictures== | | ==Pictures== |