dear katiyar,
mje340 and mje350 are 300v 0.5ampre 20.8 wattage
can u suggest me more higher ampre,wattage transistor that is as 300v 1.5 amp 45watts
hi all
The BD139/|BD140 are better than MJE340/MJE350. The MJ's are a high voltage device and many years old when HV transistors gave optimum current gains around 50mA, and give up at much higher currents. And they are slower. But the BD's have a voltage limit of 80 or 100v. The original rating specified by MUllard/Philips was 100v BVcbo, and all the samples I have checked will work up to 100V OK. BUT some manufacturers only spec. to 80V (which they should not if they conform to the originals).
Either way you need higher voltages and better gain at higher current than either pair for 200W amps. I tended to go for 2SC2238/2SA968 (160V) but these are now old too, but there are new devices of similar performance.
Something like the MJE15034/MJE15035 pair would seem to be a good choice (50W/350V) and they have an fT around 60MHz.
The BD139/|BD140 are better than MJE340/MJE350. The MJ's are a high voltage device and many years old when HV transistors gave optimum current gains around 50mA, and give up at much higher currents. And they are slower. But the BD's have a voltage limit of 80 or 100v. The original rating specified by MUllard/Philips was 100v BVcbo, and all the samples I have checked will work up to 100V OK. BUT some manufacturers only spec. to 80V (which they should not if they conform to the originals).
Either way you need higher voltages and better gain at higher current than either pair for 200W amps. I tended to go for 2SC2238/2SA968 (160V) but these are now old too, but there are new devices of similar performance.
Something like the MJE15034/MJE15035 pair would seem to be a good choice (50W/350V) and they have an fT around 60MHz.
dear sir thanks for reply
can i use c5198 and a1941 in place of mje340 and mje350.thanks
Depends how much current can your VAS? can provide...
If theres small signal transistors its not going to happen. It might work but at higher power levels your predrivers may smoke 🙂
If theres small signal transistors its not going to happen. It might work but at higher power levels your predrivers may smoke 🙂
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