Went through my inventory and found some "good" old 2N3055´s. Got a little nostalgic thinking of the JLH 69 that I built -69.
Have never seen a compound mosfet/bipolar Darlington before, so I thought I would give it a try. Sims great at 1W/8ohm and outputs over 10W, so I will build a mono pair for my midbass speakers(60-350Hz), when the heatsinks arrive. The upper registers will be fed with IRFP240 FOMO´s. The 193U that I already have are not optimal due to their high DCR, but they will do. Thermally the circuit sims OK, if mounting the IXT on the heatsink.
But is there a catch using an ancient bipolar output device 😉 ?
What I don´t understand is why the IRFP240-version falls off earlier when loaded harder? The sims show the 240 should have a Zout in the ballpark of 0.2ohm and the 3055 0.4ohm. At nominal 8ohm bass response is close to equal. Screenshot with 2ohm load.
Note the sims are not telling it all and are very basic, but indications look good.
Have never seen a compound mosfet/bipolar Darlington before, so I thought I would give it a try. Sims great at 1W/8ohm and outputs over 10W, so I will build a mono pair for my midbass speakers(60-350Hz), when the heatsinks arrive. The upper registers will be fed with IRFP240 FOMO´s. The 193U that I already have are not optimal due to their high DCR, but they will do. Thermally the circuit sims OK, if mounting the IXT on the heatsink.
But is there a catch using an ancient bipolar output device 😉 ?
What I don´t understand is why the IRFP240-version falls off earlier when loaded harder? The sims show the 240 should have a Zout in the ballpark of 0.2ohm and the 3055 0.4ohm. At nominal 8ohm bass response is close to equal. Screenshot with 2ohm load.
Note the sims are not telling it all and are very basic, but indications look good.
Thanks, just what I was looking for, actually IRF510 was the driver I first tried 😉 . The positive side compound is the same, albeit your amp in PP. Which of the two designs did you prefer?