They used D44VH10 which were a power transistor, 15A-80V-83W and were not bipolar.
They did however also use a couple D45VH7 in the power supply which were bipolar general purpose transistors.
I am not sure why the mix, and these transistors are not FETS like the IRF3205 so I do not believe the IRF3205 would work.
They did however also use a couple D45VH7 in the power supply which were bipolar general purpose transistors.
I am not sure why the mix, and these transistors are not FETS like the IRF3205 so I do not believe the IRF3205 would work.
The D44VH10 is a bipolar junction transistor. Look at the description at Mouser:
D44VH10 ON Semiconductor | Mouser
D44VH10 ON Semiconductor | Mouser
BJTs can be driven by a relatively low amplitude signal since they have a threshold of about 0.6v. FETs require a drive signal with a much greater amplitude. The threshold voltage for an FET is about 3.5v but they are generally driven with a signal that has an amplitude of about 10v (ground to +10v) to ensure that they're fully 'on'.
You can look at the amplitude of the signal to see if it's close to what the FETs need but that's not definitive as to whether they would work. I tried using FETs in an old Orion that used BJTs and even after modifying the drive circuit to get the right signal, they wouldn't work. The amp would work but the 12v primary filter caps would fail after just a few minutes at full power. After removing the drive mods and installing BJTs, the amp worked perfectly and the primary caps didn't overheat.
You can look at the amplitude of the signal to see if it's close to what the FETs need but that's not definitive as to whether they would work. I tried using FETs in an old Orion that used BJTs and even after modifying the drive circuit to get the right signal, they wouldn't work. The amp would work but the 12v primary filter caps would fail after just a few minutes at full power. After removing the drive mods and installing BJTs, the amp worked perfectly and the primary caps didn't overheat.
Here are some pics of before and after repair/upgrades. This was definitely an ongoing project / repair. There was definitely a lot of man hours in this one
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