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I would join Nick with some of the questions he asked.
Although it's not uncommon for the big companies to screw up and come up with questionable designs I assume that they should notice such obvious things as Kevin mentioned. I would also assume that those amps underwent intensive listening tests before being released moreover maybe the musicians they are named after gave their OK before that. Those are only assumptions but at least are reasonable ones.
So if we're talking about those AFD/YJM setups and take Kevin's advice we should drive the gate from lower impedance source (a CF would be the most simple solution) and change the type of MOSFET used. Well that's doable and is a good material for experiments. I hope I can record some samples as well.
Using uCU is by no means anything bad. The only downside is it's not service friendly because if it dies yo can't order it online or something but take a look at your car for example. The engine is a 100 year old technology controlled by all kinds of sensors and computers so I think uCUs can be very useful in a tube amp and should be used when necessary.
Concerning the AFD/YJM digital controlling part it's not that simple like just few extra parts thrown around the uCU. Actually patents for digital bias control are around from a long time so it's nothing new either. Even Bugera now has something similar in their amps and I think we'll be seeing more of this in the future.
Although it's not uncommon for the big companies to screw up and come up with questionable designs I assume that they should notice such obvious things as Kevin mentioned. I would also assume that those amps underwent intensive listening tests before being released moreover maybe the musicians they are named after gave their OK before that. Those are only assumptions but at least are reasonable ones.
So if we're talking about those AFD/YJM setups and take Kevin's advice we should drive the gate from lower impedance source (a CF would be the most simple solution) and change the type of MOSFET used. Well that's doable and is a good material for experiments. I hope I can record some samples as well.
Using uCU is by no means anything bad. The only downside is it's not service friendly because if it dies yo can't order it online or something but take a look at your car for example. The engine is a 100 year old technology controlled by all kinds of sensors and computers so I think uCUs can be very useful in a tube amp and should be used when necessary.
Concerning the AFD/YJM digital controlling part it's not that simple like just few extra parts thrown around the uCU. Actually patents for digital bias control are around from a long time so it's nothing new either. Even Bugera now has something similar in their amps and I think we'll be seeing more of this in the future.
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