i think you mean SA-2500 from Toshiba.
the TX-2500 is from onkyo. 40 watts per channel and has an output relay, IIRC.
the SA-2500 from Toshiba is 25 watts per channel and may not have an output relay, with such low wattages. Not all that uncommon.
eg, the NAD 3020 has no output relay, same as many others in the 25 and sub 25 watt per per channel range.
the TX-2500 is from onkyo. 40 watts per channel and has an output relay, IIRC.
the SA-2500 from Toshiba is 25 watts per channel and may not have an output relay, with such low wattages. Not all that uncommon.
eg, the NAD 3020 has no output relay, same as many others in the 25 and sub 25 watt per per channel range.