Matching the mosfets for the ZEN

[Selfmade]

Hello,

is it essential to match the mosfet (IRFP140) to divices in another channel, Or can I use unmatched divices?

Is the IRF044 the better choise?

Thanks

Günter

 

[Nelson Pass]

The 044 is a bit better.

Unmatched is fine. I match mine anyway, for the
same reason that my left and right speaker cables
are the same length and type. 🙂

 

[vdi_nenna]

Nelson,

I'm using the 044n in my Zen. I have read here that the 044 w/ the "n" designation is not good for audio. Do you know anything about this?

Vince

 

[Nelson Pass]

I am not aware of any 044N as such. There is a letter
which appears to be part of the lot code, and I have a batch
of these with the "M", but I don't think there's anything
to it.

By they way, we are intending to make these available
in matched sets on passdiy.com for the 900 or so that
I have.

 

[Nelson Pass]

An hour later:

I looked them up, and there is indeed an 044N, and
the N apparently stands for "new" 🙂

It is not the same part after all, with the biggest
alteration being a reduction in wattage rating
to 100 watts down from 180 and a lower Rds
from .028 to .02

Beyond that, I don't know whether they sound
better or worse, my only experience being with
044's. I wouldn't hesitate to try them out,
however.

 

[vdi_nenna]

It's just that some persons on this forum have said these are better for switching rather then amplification.

My Zen sounds fine. I have 10 of these and will probably build 4 mini-alephs.

Thanks for the reply.
----- ------ ------ ------ ------ ----- ------
Digi-Key Part Number IRFP044N-ND

Manufacturer Part Number IRFP044N
Description HEXFET 55V .024 RDS TO-247
Standard Package 25