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Would a 2N3055 make a suitable replacement for a 2SC1667 transistor? The 2SC1667 is from a Leak reciever - the main amp section they are used as the main amp.

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Since the 2SC1667 is still available, why substitute. The exact part can be ordered. Substitutes are fine if hte original is no longer available, but you should use the original when you can.


Posted on Jul 02, 2009

  • rbmrsm Apr 23, 2011

    I agree with Dan although the 2N3055 might work OK in an audio amp. If the amp is stereo and uses these as outputs you must replace both if you change the type. Otherwise you'll likely have an imbalance in channels. Note that the 2N3055 is a 150Watt power transistor and my use more power and strain the other components.



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If fuse blows off repetedly, it shows that there is a direct short inside the power supply section. You just check the mains rectifier diodes for short. iIf a rectifier stack is used desolder it out and check for short. In some sansui sets, ther is a metal oxide variste connected across the supply line inside directly. It is for line spike suppression and an overvoltage protection. If any of the above appears on the power line, the varistor will get shorted, and the fuse will go out, to prevent further damage to the circuits. Check that varistor for short. Check the resistance across main filter capacitor for any direct short. If it seems shorted, check the switching transistor for collectror to emitter leak, Resolder it out and check. These are the main reasons for blowing fuse. If the switching transistor has got leaked, you must check the entire SMPS control section, especially in case of used zener diodes, before replaceing a new transistor. OK.
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Unplug the PS-15KX 120V AC cord !! Then take cover off. DO NOT plug the AC cord in unless you are used to working around a lethal voltage and current !!!!!!!!!!

If you can use a Multimeter, then measure resistance across each pair of the 3 leads of the output transistors. You will probably find fractions of an ohm across a pair of leads. One or both may be shorted. NOTE: Do not ever measure resistance in a powered up circuit, kiss meter bye-bye and maybe burn you too.

By putting more robust transistors in this supply, you may not gain much reliability. The supply is rated at a continuous current draw, which is less than the intermittent current they advertise. Read the spec's of any power supply you get and look for continuous current ability.

There are several better transistors that will substitute for the 2N3055. You will need to look at a transistor substitution book and check specs. The internet is great for this. I used to use all kinds of data books, and still have them! But looking up info on-line is nice. Motorola has some that will fit and have higher current and voltage ratings,

Get someone who is a ham or geek if you aren't sure about sticking your fingers in the power supply.

Be Careful, Work Safe, it is a factor of longer life.

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They are "equivalent", but (much) bigger: you must do some bending for them to fit inside the chassis


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