I have a serious SS question. I want to replace 2SD388/2SB541 pairs. Vcbo150-Vceo140-Vebo 7-Ic8- Dissipation 80 watts. With MJ5015/MJ5016's. 200,120,7 IC,15-180 watts. Mostly because they are available and it seems people do. My concern is the higher current draw but does that matter if it only demands a certain amount to operate? I have a headache too
SS question 2SD388 Subsitute
- Thread starter Wildfara
- Start date
Help Support GroupDIY Audio Forum:
moamps
Well-known member
Do you mean you like to use MJ15015/15016?
Yes, you can use this pair instead of 2SD388/2SB541.
Yes, you can use this pair instead of 2SD388/2SB541.
Why do you want to replace them? Are they fried?
> My concern is the higher current draw
It is a a Max Limit. You don't have to suck that much. In a happy amplifier the transistors will pass exactly as much current as the speakers demand to produce the loudness which you set.
Say I have a dog-porch rated 80 pounds (three Corgis). For no good reason(?) I decide to replace with a dog-porch rated 180 pounds. If I still have only <=3 Corgis, the 180lb porch is fine. It will loaf far below breakdown. It should cost more, but transistor prices are not entirely logical or linear; popular parts can be much cheaper than less-used parts.
The 180lb dog-porch would also take one Corgi and one Great Pyrenees (today's collection, ~~130lbs). _IF_ the porch foundations can take the load! In an amplifier the supply PT, protection, and other factors mean you won't get "more power" out of bigger transistors.
> My concern is the higher current draw
It is a a Max Limit. You don't have to suck that much. In a happy amplifier the transistors will pass exactly as much current as the speakers demand to produce the loudness which you set.
Say I have a dog-porch rated 80 pounds (three Corgis). For no good reason(?) I decide to replace with a dog-porch rated 180 pounds. If I still have only <=3 Corgis, the 180lb porch is fine. It will loaf far below breakdown. It should cost more, but transistor prices are not entirely logical or linear; popular parts can be much cheaper than less-used parts.
The 180lb dog-porch would also take one Corgi and one Great Pyrenees (today's collection, ~~130lbs). _IF_ the porch foundations can take the load! In an amplifier the supply PT, protection, and other factors mean you won't get "more power" out of bigger transistors.
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