Can Aleph be built with P-channel devices? I was thinking about IRFP 9130, since I might have some extras from modding A75 into Aleph. Any drawbacks, advantages when using those for Aleph?
Yes, an ALEPH can be build using P Channel mosfets. At least
I do not see to much problems.
To illustrate this I made an example schematic of an ALEPH 3
with P Channel IRFP9140. As you can see you need to change
the input stage a little. (i.e. use n-channel IRF610).
I simulated this circuit, and it behaves very similar to the
original ALEPH 3.
I hope this helps you a little.
I do not see to much problems.
To illustrate this I made an example schematic of an ALEPH 3
with P Channel IRFP9140. As you can see you need to change
the input stage a little. (i.e. use n-channel IRF610).
I simulated this circuit, and it behaves very similar to the
original ALEPH 3.
I hope this helps you a little.
Just some examples...
Looking at the datasheets
For IRFP240
Ciss 1300 pF
Gfs 6,9 S min. pulse
For IRFP9140
Ciss 1400 pF
Gfs 6,2 S min. pulse
Please check the curves!
So, N-channel are only slightly better, but P-channel will not
make a terrible amplifier.
I remember their use in the original ZEN.
I think they are used in the X series as well.
Looking at the datasheets
For IRFP240
Ciss 1300 pF
Gfs 6,9 S min. pulse
For IRFP9140
Ciss 1400 pF
Gfs 6,2 S min. pulse
Please check the curves!
So, N-channel are only slightly better, but P-channel will not
make a terrible amplifier.
I remember their use in the original ZEN.
I think they are used in the X series as well.
remember their use in the original ZEN.
Yes..... as a fixed current source. The lastest variation of the Zen uses two N channels in the output stage. I wonder why that is?
Yes..... as a fixed current source. The lastest variation of the Zen uses two N channels in the output stage. I wonder why that is?
I made an Aleph with 9240's just for the hell of it about
8 years ago. I didn't hear or measure much difference,
but the lower price and better availability of the N channels
made it a moot point.
8 years ago. I didn't hear or measure much difference,
but the lower price and better availability of the N channels
made it a moot point.
Aleph amps and X series amps are using devices with TO3 cases. What is the major advantage of that package?
They look great. Now that they have been discontinued
and cost a lot more, they look even better!
and cost a lot more, they look even better!
Nelson Pass said:
I know the Pchannel Hitachis have a failure mechanism (precisely what I don't know) that the Nchannels lack....Seems maybe the IR Pchannels are 1rst to blow also ?????????????????
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