Bipolar LTP input stage with only one CCS
THD 1K 28V 4ohm (100w) 0.0027%
THD 1K 4V 8ohm (1w) 0.0001%
Need to change VAS CCS for thermal compensation.
BC550
More thermal stability with Jfet CCS
THD 1K 28V 4ohm (100w) 0.002729%
THD 1K 4V 8ohm (1w) 0.000105%
450mA @20°C
300mA @40°C
150mA @ 70°C