From the data sheets here are the absolute Max Voltages. As you can see the 2SC3357 has lower VCBO and VCEO:
?
????? 2SC5551??? 2SC3357
VCBO??? 40???????? 20
VCEO??? 30???????? 12
VEBO? ?? 2??? ? ??? 3
?
Measuring on an LZ1AQ amp with 2SC3357 operating at 12V, here are the max voltages over all four transistors:
?
???? Measured?? Margin
VCBO?? 5.5?????? 14.5
VCEO?? 6.2??????? 5.8
VEBO?? 0.743??? ? 2.257
?
?
So for the LZ1AQ design the 2SC3357 operates with plenty of margin.
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Mike M
