why r4, r5 unbalanced r6, r7 sir vzaichenko
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I'll take a stab at it. Different input capacitance of output devices requires different resistance to keep r/c the same.
Thank you Evan, yes - that's exactly the case. Different Ciss of n- and p-channel laterals.
thank you very much
I lack this circuit lines GND are not connected
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I have experiences with clones of Firstwatt F5 and J2 and wonder if this hybrid amp would offer potential better sound quality?
Hi Nelson - difficult to compare for me, as I don't have neither F5, nor J2.
But this one is a great-sounding one.
Tested in different environments with different acoustic systems - excellent results.
Hi, even for a test - try to keep those wires, connecting the output transistors, as short as possible. Lateral MOSFETs are sensitive to parasitic capacitances/inductances - local oscillations are possible with the long wires.
Nelson,
I can compare to f5 , f4 and balanced ba3. I like the tubsumo in my system better. Not taking anything away from the pass amps (they are exceptional) I like the class AB...less heat and wasted power. The balanced ba3 was great but was an absolute room heating monster. I say try the tubsumo or one of vzaichenko other great designs. They don't use any hard to find parts and his support is first rate.
HTH,
Evan
I can compare to f5 , f4 and balanced ba3. I like the tubsumo in my system better. Not taking anything away from the pass amps (they are exceptional) I like the class AB...less heat and wasted power. The balanced ba3 was great but was an absolute room heating monster. I say try the tubsumo or one of vzaichenko other great designs. They don't use any hard to find parts and his support is first rate.
HTH,
Evan
Hi Evan,
Thank your for your feedback, nice to know the support is in place if needed. 😊
F4 is one of my candidates for an amp project.
What do you like better with the tubsumo over the F4?
How does ambience, airiness and dynamics compare?
Anyone compared tubsumo to a first class tube amp?