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Interest for genuine NOS Harris IRFP9240s, Vgs matched quads and pairs

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EUVL

EUVL

Member
Joined 2003
xen-audio.com
#1
.
This is not a GB yet, but only to gauge interest.

And it would not be organised by the XEN team.
A very kind member of this forum in Canada will most probably be taking over the organising and matching.

In the process of the development of the UDNeSS, we wish to use NOS Harris IRFP9240s as output devices.
UDNeSS, or You don't need Semisouth's

It is well know that the currently available Vishay IRFP9240 has the same Yfs drop-off in the audio band
as the former International Rectifier versions.
See :
https://www.diyaudio.com/forums/pass-labs/281520-official-m2-schematic-45.html#post5194179 (post #2219)
http://www.firstwatt.com/pdf/art_mos_test.pdf

NOS Harris versions are still available at Rochester. MoQ is 74.
So it makes sense to buy 100x.

I wonder if there is sufficient interest for a GB.
Max 2 quads or 4 pairs per person, 20% matching reject (Vgs at 1.25A, room temperarture).
When quads run out, then you get pairs.
(But Vgs match from 100x should have good yield.)
First come first serve.
Same price. No waiting list. Otherwise too complicated.
Profits, if any, goes to charity (e.g. Unicef).

Takers are not limited to UDNeSS builders.
Equally attractive for F4's, or just to stock up while still available.
You should be looking at 5 USD per FET plus PP plus postage (~12 CAD for 200gm, no tracking).
Exact costs we shall know later (delivery to Canada, import tax, ...., etc.)


Cheers,
Patrick
 
Last edited:
#7
FWIW, in my experience Rochester doesn't enforce their minimum quantities, just their $100 minimum order. I bought 24 Harris IRFP9240s from them last year (which in hindsight was sub-optimal as I could have gotten 30 for the same price).
 
#13
I had them before, sold all my stock years ago.
No match for Toshiba's as far as I am concerned.

And the exercise here is to build the UDNeSS using Vishay and then Harris to compare.
The UDNeSS is designed to avoid NOS parts, so this is only an experiment.
The Fairchild will not serve that purpose, for us.


But thanks for the advice,
Patrick
 
#14
To the subscribers :

We have a quote from Rochester.
Once we sort out some more details, we'll go ahead with the purchase.
So we'll call for payment soon.

The organiser has a Locky_z so the FETs will be curve traced at room temperature.
How lucky we all are, and a thousand thanks to him.

😉


Patrick
 
#18
Hi,

I'll be doing the matching and shipping of the mosfets. Since there is some
uncertainty of the final cost, given the vagaries with couriers and brokerage,
I ask that you consider as a reasonable upper bound a cost of $6USD per
piece, plus approx $12 CAD in postal + paypal fees. The total, at the current
exchange rate, should be less than $80CAD for two quads.

Thanks,
Dennis
 
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