Identifying vintage transistors Please help

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Vicovibe

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Jan 8, 2009
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I have been trying to determine what transistor is in a unit I offer. The original unit was made in the late 60's and early 70's. This is a simple volt circuit and has a NPN transistor marked MSPS3353 and a PNP marked MSPS334. The NPN transistor has three lines on the back, green-silver and blue.

These sound so good and I am trying to find modern equivalents. The original transistors were Motorola I am told. If anyone has any clues, I would be very grateful for any leads.
 

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