Help I need to locate a part


I have owned Spectral amps DMA 50, 80, and still own a 90.
(I find the Audio Magic digitals sound like the 80)
Spectral, when last I spoke with them would not touch something if anyone else had been in it. This was in the days when they told folks that non-MIT cables could damage the amps.
I had a chip in the 50 blow, and an ex teck named Crosby helped me locate it as he and spectral had bought out the market on that chip.
Well, my 90 is literally giving me static and my current teck needs to
replace the I.C. and we really need to locate, either:
*the chip,
*any contact info for Mr. Crosby (who might know the chip intimately) or
*someone who knows cross referencing and may know a better alternative to
a very hard to find chip.
I'm not technical when it comes to circut specs.
But this is the info on the chip:

number NPD5566.
The other number which we believe is a date code only is M9384.

So if anyone can please help me, email me any leads, I will be very
grateful.
This amp already has upgraded RCAs, binding posts, I.E.C. input and output
wire, and is sounding closer to the next version as well as nearly like
the next size up.
Thank You all in advance for any assistance you may provide.
Spiro
spiro

Showing 2 responses by spiro

Thanks folks.
After I posted, I tried google and found the mention of the n-ch jfet as well.
But may I ask, regarding the B.Browns, what improvement would they make in an amplifier?
Are they a straight replacement in that app to the NPD?
Also, John, C. I saw hat and couldn't get into the thread on the given link.
So thank you all.
Anyone have info on Mr. Crosby, the "Crosby Quad's" technician?
Thank you.

Hi Folks,
I will take strongly the advice to keep away from fet-rolling :(
My experience with Spectral was under the following conditions:
"Hi, I have a DMA 50, I love it. But my teck tells me that it needs a
motorola part that can no longer be found. I've alot of upgrades in it,
like top Vampire (was the brand that they used) RCAs and binding posts
(that
they previously told me *they wouldn't do as an upgrade). Can you help me
with this?"
"No, we will not acept back any product that anyone else has been inside."
Now, i didn't demand to talk to Rick, and didn't like the attitude that the woman gave me, though she might really have been an upper crust *lady. I contacted "Crosby" and he said that he bought up all the rest of that Motorola chip that Spectral hadn't and he sold me 2, for 50 a piece.
My experience with Pass Labs (6 months later) was, "oh yeah, you can upgrade lots of parts in the Aleph 3, diagrams are on the net, or we can mail them to you... or I can look up the vaues if you want."
so after a decade with Spectral, I spent the next decade giving money to
Pass Labs in my upgrade fever. If the folks at Spectral are no longer commanding MIT cables (as I've heard) and will do what even the lofty Krell will, (fix and charge you, and do it again if you like) then my impressions are out dated. For any outdated info I convey, I apologize. But it turned me off big time.
Thanks for all of your comments folks.
BTW: Husky, told me that New Jersey Semi Conductor has them. The part in
the
amp *has the National Semi conductor logo on it, and calling NJSC
found 40 in stock.
Thank you all very much.