I want to build this nice headphone amp, designed by Benny Jørgensen and improved by Cavalli and Kan, it seems to me to be a very nice headphone amp!
(More infos are here by the way)
However it uses BD139/BD140 as output transistors, and I read recently that only the original Philips parts are recommended (long discontinued), so I thought of using the OnSemi MJE15030 instead.
What do you think? Is this a suitable (or better) replacement?
Just wasting money?
Cheers, Hannes
PS:
Datasheet MJE15030
(More infos are here by the way)
However it uses BD139/BD140 as output transistors, and I read recently that only the original Philips parts are recommended (long discontinued), so I thought of using the OnSemi MJE15030 instead.
What do you think? Is this a suitable (or better) replacement?
Just wasting money?
Cheers, Hannes
PS:
Datasheet MJE15030
Thanks for your reply!
It's just that I'm not registered over there and I'm too lazy to do so now.
However I contacted K and he suggests the MJE243/253. Above stated MJE15030 have incompatible pin-out by the way.
Cheers, Hannes
PS: the support is really outstanding! I just mailed him and got immediate and helpful reply!
It's just that I'm not registered over there and I'm too lazy to do so now.
However I contacted K and he suggests the MJE243/253. Above stated MJE15030 have incompatible pin-out by the way.
Cheers, Hannes
PS: the support is really outstanding! I just mailed him and got immediate and helpful reply!
Just by looking at datasheets I would guess that a BD179/BD180 should also be very nice; it has a low Ft of 3 MHz though (the original BD139 from Philips had 160 Mhz, however the datasheets of BD139 made by other different manufacturers don't state a Ft at all).
So I anyone could tell me the gain of the output stage I would know how that would affect bandwidth (I would guess that it doesn't matter at all).
Cheers, Hannes
So I anyone could tell me the gain of the output stage I would know how that would affect bandwidth (I would guess that it doesn't matter at all).
Cheers, Hannes
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