Changing BF's for MJE's

[Bensen]

Is it possible to chance the BF471 and BF472 drivers in de Crescendo amplifier (140W) with mje15030 and mje15031 without changing or recalculating resistors.
Is this not, which resistors should change, and to what valvue?

 

[hugobross]

Hi,

I'm glad to meet another Belgian student here.

Is this the same circuit?? Sorry cannot find the BF drivers...

Best regards,

HB.

 

[sajti]

Is it possible to chance the BF471 and BF472 drivers in de Crescendo amplifier (140W) with mje15030 and mje15031 without changing or recalculating resistors.
Is this not, which resistors should change, and to what valvue?

Hi,

I recommend MJE340/350 instead of MJE15030/31. The 15030/31 designed for driver stage application. It useful with 50mA bias current, or higher. I measured the B of this device, and it falls hardly under 50mA.

Sajti