new GAN amplifier

Excellent cust svc

@atdavid is correct. By the time anyone had modified a MOSFET amp to run with BJTs it would be an entirely different amplifier. There simply would be no way to compare 'before' and 'after'. Its highly unlikely that anyone ever did a mod like this unless the amp was gutting for its chassis and power supply.

Its highly unlikely that anyone ever did a mod like this unless the amp was gutting for its chassis and power supply.

Include to the the complete chassis, transformer/s, power supply, the heatsinks and input stage to that, which is around 80% of the amp.

What’s left is the driver/output stage and bias mods. So yes I see it as doable, as he said he’s doing, but I think it would be limited to T03 case substitutions, otherwise would get messy.
And yes two different amps one Mosfet the other BJT using the same 80% above components.

Output stage, the stage before the output stage, hopefully the feedback network, the bias circuitry for the output stage ..... It's a different amplifier.

Can you even buy TO3 transistors any more? (TO3, as opposed to TO3P which is a different beast). I think with the exception of MIL they have all been long obsoleted.

It's a different amplifier.

Sorry, same amp with different output/driver stage and bias change.That allows one to directly compare same amount of Mosfet devices to the same amount of BJT devices

Can you even buy TO3 transistors any more

Of course you can don't be an *****, and they're still cheap and plentiful,  just look around.https://www.ebay.com/itm/1pairs-OR-2PCS-Transistor-MOTOROLA-TO-3-MJ15003-MJ15004-100-Genuine-Origina...

End of story, no more on this as it's not about the title "new GaN Amplifiers"