This 2-channel hybrid IC is normally configured with TIP142/147 power darlingtons for its' output. For those who prefer to use power transistors instead, the TDA7250 can easily be converted. All that is required are a few transistors, 4 additional resistors and some rewiring.
This conversion centers mainly on changing the output section to a Sziklai.
 Sziklai Output | In our IA502 on the right, drivers Q1,Q2 are 2SC2238 and 2SA968, and outputs Q5,Q6 are 2SA1216 and 2SC2922 respectively. No instability problems were encountered from this conversion. After a period of run-in, the amplifier remained thermally stable. Is this version worth the extra cost and effort? |
If one is only interested in something basic, the TIP version would be sufficient. But if one is after sonic performance, I would recommend this version.
 2SC2922/2SA1216 hardwired |  the TDA7250 ic |
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