Systemic Development > Amplification and Preamplification

Upgrade Mosfets

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S Clark:
I finally got an old Moscode 300 amp back to George Kaye for repair.  He's come up with a way to double the number of mosfets for supposedly a magical and mystical improvement- at a price that isn't crazy.  Anyone here know what doubling the number of mosfets would effectively do?

HAL:
Scott,
I believe that a company called Magnetec in the UK at one point was able to put two of the Hitachi style power MOSFET die in one case to effectively make two in one.  That would drop the device output impedance in half and allow greater output drive current capability. 

It would also double the input capacitance of the MOSFET device, so mods to the driver stage might be needed.

A friend uses them in his power amp design and he started with the Hitachi devices years ago like Hafler used in the DH200 amps.

S Clark:

--- Quote from: HAL on October 23, 2020, 09:12:24 PM ---... That would drop the device output impedance in half and allow greater output drive current capability. 

It would also double the input capacitance of the MOSFET device, so mods to the driver stage might be needed...


--- End quote ---
... so, more headroom, more open and spacious???

HAL:
Probably more bass control or lower extension with more current drive.  With no driver stage change, might roll off the top end.

tmazz:
Does the double Mosfet mod change the output power?

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