This can be easily solved with NFB (neg.feedback) using an Op Amp with some low gain but adequate GBW or a better CE amplifier with RC feedback from the output to the input with a series R added from source to achieve about half of the expected gain from R ratios.

Consider Rs=100 added or included and 2k for NFB from output to cap to base for a maybe gain of 10.

Each TIP on the datasheet has an hFE = 25 typ. @ 3A and approx =130 @ 3A/25A or a net gain of In order to have high Damping factor >>100 the Zout must be <<1% of the 8 ohm load.

• since 2 stages only yields a total hFEt=3250 x 8 ohm load , Req= 8*3250 = 26k for maximum power transfer, but for damping the source impedance must be <<1% of this or 260 ohms which is near the open loop Rout of many Op Amps.
  • Your CE amp has an output R=122 ought to be OK
• But with NFB using the inverting feedback of an Op Amp this can be reduced by Gain.
• Stray capacitance can cause loss of phase margin so an RC snubber is used to attenuation potential oscillations at low gain.
• so choice of Op Amp with high GBW is preferred for fmax in your passband is desirable, e.g. >=10MHz and Av=<10?

Then your crossover distortion reduces by amount feedback gain e.g. 10MHz/100kHz/Av=10=10

You must define your design goals for THD and gain with f first.

This can be easily solved with NFB (neg.feedback) using an Op Amp with some low gain but adequate GBW or a better CE amplifier with RC feedback from the output to the input with a series R added from source to achieve about half of the expected gain from R ratios. also adding Re=5 improves THD yet reduces gain to 112/5. Define desired gain better to choose.

Consider Rs=100 added or included and 2k for NFB from output to cap to base for a maybe gain of 10.

Each TIP on the datasheet has an hFE = 25 typ. @ 3A and approx =130 @ 3A/25A or a net gain of In order to have high Damping factor >>100 the Zout must be <<1% of the 8 ohm load.

• since 2 stages only yields a total hFEt=3250 x 8 ohm load , Req= 8*3250 = 26k for maximum power transfer, but for damping the source impedance must be <<1% of this or 260 ohms which is near the open loop Rout of many Op Amps.
  • Your CE amp has an output R=122 ought to be OK
• But with NFB using the inverting feedback of an Op Amp this can be reduced by Gain.
• Stray capacitance can cause loss of phase margin so an RC snubber is used to attenuation potential oscillations at low gain.
• so choice of Op Amp with high GBW is preferred for fmax in your passband is desirable, e.g. >=10MHz and Av=<10?

Then your crossover distortion reduces by amount feedback gain e.g. 10MHz/100kHz/Av=10=10

You must define your design goals for THD and gain with f first.

This can be easily solved with NFB using an Op Amp with some low gain but adequate GBW or a better CE amplifier with RC feedback from the output to the input with a series R added from source to achieve about half of the expected gain from R ratios.

Consider Rs=100 added and 2k for NFB to cap to base for a maybe gain of 10.

Each TIP on the datasheet has an hFE = 25 typ. @ 3A and approx =130 @ 3A/25A or a net gain of In order to have high Damping factor >>100 the Zout must be <<1% of the 8 ohm load.

• since 2 stages only yields a total hFEt=3250 x 8 ohm load , Req= 8*3250 = 26k for maximum power transfer, but for damping the source impedance must be <<1% of this or 260 ohms which is near the open loop Rout of many Op Amps. But with NFB using the inverting feedback of an Op Amp this can be reduced by Gain. Stray capacitance can cause loss of phase margin so an RC snubber is used to attenuation potential oscillations at unity gain. so choice of Op Amp with high GBW is preferred for fmax in your passband is desirable, e.g. >=10MHz and Av=<10?

Then your crossover distortion reduces by amount feedback gain e.g. 10MHz/100kHz/Av=10=10

You must define your design goals for THD and gain with f first.

This can be easily solved with NFB (neg.feedback) using an Op Amp with some low gain but adequate GBW or a better CE amplifier with RC feedback from the output to the input with a series R added from source to achieve about half of the expected gain from R ratios.

Consider Rs=100 added or included and 2k for NFB from output to cap to base for a maybe gain of 10.

Each TIP on the datasheet has an hFE = 25 typ. @ 3A and approx =130 @ 3A/25A or a net gain of In order to have high Damping factor >>100 the Zout must be <<1% of the 8 ohm load.

• since 2 stages only yields a total hFEt=3250 x 8 ohm load , Req= 8*3250 = 26k for maximum power transfer, but for damping the source impedance must be <<1% of this or 260 ohms which is near the open loop Rout of many Op Amps.
  • Your CE amp has an output R=122 ought to be OK
• But with NFB using the inverting feedback of an Op Amp this can be reduced by Gain.
• Stray capacitance can cause loss of phase margin so an RC snubber is used to attenuation potential oscillations at low gain.
• so choice of Op Amp with high GBW is preferred for fmax in your passband is desirable, e.g. >=10MHz and Av=<10?

Then your crossover distortion reduces by amount feedback gain e.g. 10MHz/100kHz/Av=10=10

You must define your design goals for THD and gain with f first.